What is the function and operation of a power brake booster on Chevrolet Caprice?

An assistor, power brake booster, has been included on all models since and can utilize vacuum from the manifold of the engine. When there is fault in the booster, enough vacuum is reserved to help with two or three brake application, additional pressure is then required in the hydraulic brake system. Different kinds of power brake boosters consist of Delco-Moraine and Bendix, and both works on the same mechanism. In case brakes are released and in the same time the engine is on, vacuum is present on the both sides of the power piston, simultaneously, the air filters enters and is stopped in the air valve. When the driver applies the brake, pressing the brake pedal, the push rod gets translated, which leads to the admission of atmospheric air and consequent forward stroke of the power piston that redistributes the oil in the hydraulic master cylinder and at the same time feeds back to the driver. Namely, the power piston remains in that position once the desired level of braking force has been developed; the brake pedal pressure will alter it. Letting go of the pedal pressure opens the air valve and it comes into contact with the power piston, thus sealing the admission of atmospheric air, and also resets the power piston to its original position which then releases the hydraulic pressure. In case of vacuum failure, the brake pedal is useable for emergency braking, which demands higher pressure much as standard brake system. This involves the examination of hoses and the air filter of the power brake unit The dismantling of a power brake unit can be best done, with power brake special tools while it is more advisable to replace power brake unit than overhaul it, after a fault has been discovered.

What is the function and operation of a power brake booster on Chevrolet El Camino?

A power brake booster is standard across all models and came with the vacuum system derived from the manifold of the engine. Ideally, vacuum is accumulated in case of a failure in the booster to manage two or three brake applications after which more force such as in any hydraulic system is applied to the brake pedal. Other types of power brake boosters are the Delco-Moraine and Bendix boosters and both work in a similar manner. When the brakes are released the vacuum is possible on both sides of the power piston, the air through the filter enters, and in turn, any air in the circuit is drawn through a narrow passage and into the intake manifold by means of a check valve. When the brake pedal is pressed, this pushes the push rod that in turns moves the air valve thus opens to allow air from the environment into the housing so as to motivate the power piston to operate the hydraulic master piston. As pressure increases the hydraulic reaction plate comes in contact with the reaction levers to feedback to the pedal that the degree of brake has been applied for the driver to feel. When the required braking force has been realized, the power piston stops moving in case of alteration of pressure on the pedal. Venting pedal pressure returns the air valve to engage the power piston thus sealing off supply of atmospheric air and with the help of piston, the hydraulic pressure inside the brake system is relieved by receding into the rear housing. Should there be vacuum failure for instance when the engine is off or when there is a bad vacuum line then the brake pedal can still be applied though at a higher pedal pressure that a normal system. The power brake unit does not need any special degree of maintenance, apart from the inspection of the hoses and the air filter located beneath the boot on the side of the push rod from the pedal. Removal of the power brake unit requires special tools and it is best to get a new or re-manufactured unit as replacement on the occurrence of a problem if not warrantied by the company.

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229 Brake Boosters found

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Chevrolet Power Brake Booster Assembly
Part Number: 19371362
$292.46 MSRP: $570.10
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Product Specifications
- Other Name: Booster Asm,P/B; Booster Assembly, Brake Booster
- Replaces: 15854061, 20940395, 20759772, 20940393, 25802513
Fits the following Chevrolet Models:
- Silverado | 2007-2010 | CREW CAB 1 TON, CREW CAB 6'6" BOX 3/4 TON, CREW CAB 8' BOX 3/4 TON, EXTENDED CAB 1 TON, EXTENDED CAB 6'6" BOX 3/4 TON, EXTENDED CAB 8' BOX 3/4 TON, EXTENDED CAB CHASSIS 1 TON 161.5, REGULAR CAB 1 TON, REGULAR CAB 3/4 TON, REGULAR CAB CHASSIS 1 TON 137.0, REGULAR CAB CHASSIS 1 TON 161.5 | 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.6L Diesel
- Suburban | 2007-2011 | 3/4 TON | 8 Cyl 6.0L, 8 Cyl 6.0L Flex
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Chevrolet BOOSTER ASM,P/B
Part Number: 19371356
$471.32 MSRP: $926.87
You Save: $455.55 (50%)
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Product Specifications
- Other Name: Booster Assembly, Brake Booster
- Replaces: 15212480, 15218247, 15854059, 15183760, 15126867, 15814411
Fits the following Chevrolet Models:
- Avalanche | 2003-2006 | 3/4 TON | 8 Cyl 8.1L
- Silverado | 2003-2007 | 1500 CREW CAB LONG BOX, 2500 CREW CAB LONG BOX, 2500 CREW CAB STANDARD BOX, 2500 EXTENDED CAB LONG BOX, 2500 EXTENDED CAB STANDARD BOX, 2500 REGULAR CAB, 3500 CHASSIS EXTENDED CAB 161.5, 3500 CHASSIS REGULAR CAB 137.0, 3500 CHASSIS REGULAR CAB 161.5, 3500 CREW CAB, 3500 EXTENDED CAB, 3500 REGULAR CAB, CLASSIC 1500 CREW CAB LONG BOX, CLASSIC 1500 CREW CAB STANDARD BOX, CLASSIC 1500 EXTENDED CAB LONG BOX, CLASSIC 1500 EXTENDED CAB SHORT BOX, CLASSIC 1500 EXTENDED CAB STANDARD BOX, CLASSIC 1500 REGULAR CAB LONG BOX, CLASSIC 1500 REGULAR CAB STANDARD BOX, CLASSIC 2500 CREW CAB LONG BOX, CLASSIC 2500 CREW CAB STANDARD BOX, CLASSIC 2500 EXTENDED CAB LONG BOX, CLASSIC 2500 EXTENDED CAB STANDARD BOX, CLASSIC 2500 REGULAR CAB, CLASSIC 3500 CHASSIS EXTENDED CAB 161.5, CLASSIC 3500 CHASSIS REGULAR CAB 137.0, CLASSIC 3500 CHASSIS REGULAR CAB 161.5, CLASSIC 3500 CREW CAB, CLASSIC 3500 EXTENDED CAB, CLASSIC 3500 REGULAR CAB | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.6L Diesel, 8 Cyl 8.1L
- Suburban | 2003-2006 | 1500 CREW CAB LONG BOX, 2500 CREW CAB LONG BOX, 2500 CREW CAB STANDARD BOX, 2500 EXTENDED CAB LONG BOX, 2500 EXTENDED CAB STANDARD BOX, 2500 REGULAR CAB, 3/4 TON, 3500 CHASSIS EXTENDED CAB 161.5, 3500 CHASSIS REGULAR CAB 137.0, 3500 CHASSIS REGULAR CAB 161.5, 3500 CREW CAB, 3500 EXTENDED CAB, 3500 REGULAR CAB, CLASSIC 1500 CREW CAB LONG BOX, CLASSIC 2500 CREW CAB LONG BOX, CLASSIC 2500 CREW CAB STANDARD BOX, CLASSIC 2500 EXTENDED CAB LONG BOX, CLASSIC 2500 EXTENDED CAB STANDARD BOX, CLASSIC 2500 REGULAR CAB, CLASSIC 3500 CHASSIS EXTENDED CAB 161.5, CLASSIC 3500 CREW CAB, CLASSIC 3500 EXTENDED CAB, CLASSIC 3500 REGULAR CAB, EXT 3/4 TON, XL 3/4 TON | 8 Cyl 6.0L, 8 Cyl 8.1L
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Chevrolet Power Brake Booster Assembly
Part Number: 19371355
$394.09 MSRP: $766.58
You Save: $372.49 (49%)
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Product Specifications
- Other Name: Booster Asm,P/B; Booster Assembly, Brake Booster
- Replaces: 15167549, 15183759, 15854058, 15212479, 15218248, 15126866, 15814410
Fits the following Chevrolet Models:
- Avalanche | 2003-2006 | 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex
- Suburban | 2003-2006 | 1/2 TON, 4 DOOR 1/2 TON, EXT 1/2 TON, XL 1/2 TON, YUKON/DENALI | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 8.1L
- Tahoe | 2003-2006 | 4 DOOR 1/2 TON | 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex
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Chevrolet BOOSTER ASM,P/B
Part Number: 19371364
$315.03 MSRP: $617.86
You Save: $302.83 (50%)
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Product Specifications
- Other Name: Booster Assembly, Brake Booster
- Replaces: 25790711, 20774171, 20941664
Fits the following Chevrolet Models:
- Express | 2008-2011 | 1 TON CARGO EXPRESS, 1 TON CARGO SAVANA, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 3/4 TON CARGO EXPRESS, 3/4 TON CARGO SAVANA, 3/4 TON PASSENGER EXPRESS, 3/4 TON PASSENGER SAVANA | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 4.8L Flex, 8 Cyl 5.3L, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.6L Diesel
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Chevrolet Power Brake Booster Kit(Vacuum)
Part Number: 22908218
$790.52 MSRP: $1540.92
You Save: $750.40 (49%)
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Product Specifications
- Other Name: Booster Kit,Power Brake(Vacuum); Booster Assembly, Brake Booster, Power Booster
- Replaces: 13317102
Fits the following Chevrolet Models:
- Malibu | 2013-2016 | LS 4 DOOR NOTCHBACK, LT 4 DOOR NOTCHBACK, LTZ 4 DOOR NOTCHBACK | 4 Cyl 2.0L, 4 Cyl 2.4L, 4 Cyl 2.5L
- Orlando | 2012-2014 | LS 4 DOOR HIGH ROOF WAGON, LT 4 DOOR HIGH ROOF WAGON, LTZ 4 DOOR HIGH ROOF WAGON | 4 Cyl 2.4L
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Chevrolet Power Brake Booster Kit(Vacuum)
Part Number: 84251010
$78.52 MSRP: $148.16
You Save: $69.64 (47%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Booster Kit, Power Brake (Vacuum); Booster Assembly, Brake Booster
- Replaced by: 84749955
- Replaces: 23311737, 23234989
Fits the following Chevrolet Models:
- Colorado | 2015-2022 | CREW CAB - 5'2" BOX, CREW CAB - 6'2" BOX, CREW CAB LS - 6'2" BOX, CREW CAB LT - 6'2" BOX, EXT CAB - 6'2" BOX, EXTENDED CAB - 6'2" BOX, LS CREW CAB - 5'2" BOX, LS EXTENDED CAB - 6'2" BOX, LT CREW CAB - 5'2" BOX, LT EXTENDED CAB - 6'2" BOX | 4 Cyl 2.5L, 4 Cyl 2.8L Diesel, 6 Cyl 3.6L
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Chevrolet Power Brake Booster ASSEMBLY
Part Number: 84474523
$433.71 MSRP: $762.40
You Save: $328.69 (44%)
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Product Specifications
- Other Name: Booster Assembly, P/B; Booster Assembly, Brake Booster
- Replaces: 22869378, 84031702, 22800156
Fits the following Chevrolet Models:
- Express | 2012-2024 | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS, Van 3/4 Ton Cargo Express | 4 Cyl 2.8L Diesel, 6 Cyl 4.3L, 8 Cyl 4.8L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.6L, 8 Cyl 6.6L Diesel
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Chevrolet Brake Master Cylinder
Part Number: 86788482
$963.69 MSRP: $1647.85
You Save: $684.16 (42%)
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Product Specifications
- Other Name: CYLINDER ASM-BRK MAS(W/P/B BOOS&ELEK BRK), Master Cylinder, Master Cylinder Assembly; Brake Master Cylinder with Power Brake Booster and Brake Booster Control Module
- Replaced by: 85077522
- Replaces: 84514095, 84514094, 84933511, 84821586, 85124356, 84702004, 84821585, 84933510, 84702005
Fits the following Chevrolet Models:
- Silverado | 2019-2022 | CREW 5'8" BOX 1/2 TON, CREW 5'8" BOX 1/2 TON(VIN REQ'D), CREW CAB 5'8" BOX 1/2 TON, CREW CAB 6'6" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 8' BOX 1/2 TON, REGULAR CAB 6'6" BOX 1/2 TON, REGULAR CAB 8' BOX 1/2 TON | 4 Cyl 2.7L, 6 Cyl 3.0L Diesel, 6 Cyl 4.3L, 8 Cyl 5.3L, 8 Cyl 6.2L, 8 Cyl 6.6L, 8 Cyl 6.6L Diesel, 8 Cyl5.3L
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Chevrolet Booster Assembly, P/B
Part Number: 84602473
$104.55 MSRP: $203.79
You Save: $99.24 (49%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Booster, Booster Assembly, Brake Booster
- Replaces: 23135220
Fits the following Chevrolet Models:
- Silverado | 2014-2019 | 1500 CREW CAB, 1500 CREW CAB STANDARD BOX, 1500 DOUBLE CAB STANDARD BOX, 1500 REGULAR CAB LONG BOX, 1500 REGULAR CAB STANDARD BOX, CREW CAB 1/2 TON | 6 Cyl 4.3L, 8 Cyl 5.3L, 8 Cyl 6.2L
- Suburban | 2015-2020 | 1500 4 DOOR UTILITY | 8 Cyl 5.3L, 8 Cyl 6.2L
- Tahoe | 2015-2020 | 1500 4 DOOR UTILITY | 8 Cyl 5.3L, 8 Cyl 6.2L
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Chevrolet CYLINDER ASM-BRK MAS(W/P/B BOOS&ELEK BRK)
Part Number: 87815018
$871.74 MSRP: $1442.81
You Save: $571.07 (40%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Master Cylinder, Master Cylinder Assembly
- Replaced by: 85697531
Fits the following Chevrolet Models:
- Silverado | 2022-2023 | CREW CAB 5'8" BOX 1/2 TON, CREW CAB 6'6" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, REGULAR CAB 6'6" BOX 1/2 TON, REGULAR CAB 8' BOX 1/2 TON | 4 Cyl 2.7L, 6 Cyl 3.0L Diesel, 6 CYL 3.0L Diesel, 8 Cyl 5.3L, 8 Cyl 6.2L, 8 Cyl 6.6L, 8 Cyl 6.6L Diesel
- Suburban | 2022-2023 | 1/2 TON | 6 Cyl 3.0L Diesel, 8 Cyl 5.3L, 8 Cyl 6.2L
- Tahoe | 2022-2023 | 4 DOOR 1/2 TON | 6 Cyl 3.0L Diesel, 8 Cyl 5.3L, 8 Cyl 6.2L
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Chevrolet BOOSTER ASM,P/B
Part Number: 19432805
$566.48 MSRP: $1097.56
You Save: $531.08 (49%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Booster Assembly, Brake Booster, Master Cylinder
- Replaces: 84164392, 22745515, 19417216, 22881356
Fits the following Chevrolet Models:
- Avalanche | 2012-2013 | 1/2 TON | 8 Cyl 5.3L Flex
- Silverado | 2012-2013 | CREW CAB 1/2 TON, EXTENDED CAB 5'8" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 8' BOX 1/2 TON, REGULAR CAB 6'6" BOX 1/2 TON, REGULAR CAB 8' BOX 1/2 TON | 6 Cyl 4.3L, 8 Cyl 4.8L Flex, 8 Cyl 5.3L Flex, 8 Cyl 6.0L Flex, 8 Cyl 6.2L Flex
- Suburban | 2012-2014 | 1/2 TON | 8 Cyl 5.3L Flex
- Tahoe | 2012-2014 | 4 DOOR 1/2 TON | 8 Cyl 5.3L Flex
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Chevrolet Power Brake Booster ASSEMBLY
Part Number: 84609220
$244.85 MSRP: $481.51
You Save: $236.66 (50%)
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Product Specifications
- Other Name: Booster Assembly, P/B; Booster Assembly, Brake Booster
Fits the following Chevrolet Models:
- Silverado | 2020-2024 | 1 TON CREW CAB 6'6" BOX 1 TON, CREW CAB 1 TON CHASSIS 137.0, CREW CAB 6'6" BOX 1 TON 119.0, CREW CAB 6'6" BOX 3/4 TON, CREW CAB 8' BOX 1 TON, CREW CAB 8' BOX 3/4 TON, EXTENDED CAB 6'6" BOX 3/4 TON, EXTENDED CAB 8' BOX 1 TON, EXTENDED CAB 8' BOX 3/4 TON, EXTENDED CREW CAB 1 TON CHASSIS 161.5, REGULAR CAB 1 TON CHASSIS 137.0, REGULAR CAB 1 TON CHASSIS 161.5, REGULAR CAB 8' BOX 1 TON, REGULAR CAB 8' BOX 3/4 TON | 4 Cyl 2.7L, 6 Cyl 3.0L Diesel, 6 CYL 3.0L Diesel, 8 Cyl 5.3L, 8 Cyl 6.2L, 8 Cyl 6.6L, 8 Cyl 6.6L Diesel
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Chevrolet BOOSTER ASM,P/B
Part Number: 19432803
$334.51 MSRP: $657.84
You Save: $323.33 (50%)
ADD TO CART
Product Specifications
- Other Name: Booster Assembly, Brake Booster
- Replaces: 20877277, 84164393, 19417211, 20896308
Fits the following Chevrolet Models:
- Avalanche | 2010-2011 | 1/2 TON | 8 Cyl 5.3L Flex
- Silverado | 2010-2011 | CREW CAB 1/2 TON, EXTENDED CAB 5'8" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 8' BOX 1/2 TON, REGULAR CAB 6'6" BOX 1/2 TON, REGULAR CAB 8' BOX 1/2 TON | 6 Cyl 4.3L, 8 Cyl 4.8L Flex, 8 Cyl 5.3L Flex, 8 Cyl 6.0L Flex, 8 Cyl 6.2L Flex
- Suburban | 2010-2011 | 1/2 TON | 8 Cyl 5.3L Flex
- Tahoe | 2010-2011 | 4 DOOR 1/2 TON | 8 Cyl 5.3L Flex
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Chevrolet Power Brake Booster Assembly
Part Number: 19371367
$383.11 MSRP: $696.56
You Save: $313.45 (45%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Booster Asm,P/B; Booster Assembly, Brake Booster
- Replaces: 22800155, 22869377
Fits the following Chevrolet Models:
- Express | 2012-2014 | 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 5.3L
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Chevrolet BOOSTER KIT-P/B (VAC)
Part Number: 84927728
$155.87 MSRP: $301.20
You Save: $145.33 (49%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Booster Assembly, Brake Booster
- Replaces: 23358495, 84038602
Fits the following Chevrolet Models:
- Malibu | 2016-2022 | L 4 DOOR NOTCHBACK, LS 4 DOOR NOTCHBACK, LT 4 DOOR NOTCHBACK, LTZ 4 DOOR NOTCHBACK, RS 4 DOOR NOTCHBACK | 4 Cyl 1.5L, 4 Cyl 1.8L, 4 Cyl 2.0L
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Chevrolet BOOSTER ASM,P/B
Part Number: 19432804
$411.00 MSRP: $801.18
You Save: $390.18 (49%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Booster Assembly, Brake Booster
- Replaces: 19417213, 84164390, 15886470
Fits the following Chevrolet Models:
- Silverado | 2007-2011 | CREW CAB 1/2 TON, EXTENDED CAB 5'8" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 8' BOX 1/2 TON, REGULAR CAB 6'6" BOX 1/2 TON, REGULAR CAB 8' BOX 1/2 TON | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 4.8L Flex, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L Flex
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Chevrolet Booster Assembly, P/B
Part Number: 84635614
$83.20 MSRP: $229.68
You Save: $146.48 (64%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Brake Booster, Power Booster
- Replaced by: 19432798
Fits the following Chevrolet Models:
- Traverse | 2015-2017, 2010-2012 | SPORT UTILITY VEHICLE 2WD, SPORT UTILITY VEHICLE 4WD, SPORT UTILITY VEHICLE AWD | 6 Cyl 3.6L
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Chevrolet BOOSTER ASM,P/B
Part Number: 19432806
$451.77 MSRP: $888.44
You Save: $436.67 (50%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Booster Assembly, Brake Booster
- Replaces: 19417219, 25827889, 84177387
Fits the following Chevrolet Models:
- Avalanche | 2009 | 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L
- Silverado | 2009 | CREW CAB 1/2 TON, EXTENDED CAB 5'8" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 8' BOX 1/2 TON, REGULAR CAB 6'6" BOX 1/2 TON, REGULAR CAB 8' BOX 1/2 TON | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.2L Flex
- Suburban | 2009 | 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L
- Tahoe | 2009 | 4 DOOR 1/2 TON | 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex
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Chevrolet Power Brake Booster Kit(Vacuum)
Part Number: 84730945
$111.57 MSRP: $217.48
You Save: $105.91 (49%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Booster Kit, P/B (Vac); Brake Booster, Power Booster
- Replaces: 84486952, 23371176
Fits the following Chevrolet Models:
- Blazer | 2019-2024 | HIGH COUNTRY/LTZ 4 DOOR SUV, L 4 DOOR SUV, LT 4 DOOR SUV, RS 4 DOOR SUV | 4 Cyl 2.5L, 6 Cyl 3.6L
- Traverse | 2018-2024 | 1LT/2LT EXTENDED 4 DOOR SUV, 1LZ/2LZ EXTENDED 4 DOOR SUV, LS EXTENDED 4 DOOR SUV, LT EXTENDED 4 DOOR SUV, LTZ EXTENDED 4 DOOR SUV | 4 Cyl 2.0L, 6 Cyl 3.6L
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Chevrolet BOOSTER ASM,P/B
Part Number: 19432809
$174.67 MSRP: $314.72
You Save: $140.05 (45%)
Product Specifications
- Replaces: 10367085, 15804966, 19209324, 19418518, 84177388, 15840835, 15250764
Fits the following Chevrolet Models:
- Silverado | 2005-2007 | 1500 CREW CAB STANDARD BOX, 1500 EXTENDED CAB LONG BOX, 1500 EXTENDED CAB SHORT BOX, 1500 EXTENDED CAB STANDARD BOX, 1500 REGULAR CAB LONG BOX, 1500 REGULAR CAB STANDARD BOX, CLASSIC 1500 CREW CAB STANDARD BOX, CLASSIC 1500 EXTENDED CAB LONG BOX, CLASSIC 1500 EXTENDED CAB SHORT BOX, CLASSIC 1500 EXTENDED CAB STANDARD BOX, CLASSIC 1500 REGULAR CAB LONG BOX, CLASSIC 1500 REGULAR CAB STANDARD BOX | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L

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Chevrolet Brake Booster

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Chevrolet Brake Booster Parts Questions & Experts Answers

Power Brake Booster Assembly (Hydraulic) (Service)
1620210
Q: What is the function and operation of a power brake booster on Chevrolet Caprice?
A: An assistor, power brake booster, has been included on all models since and can utilize vacuum from the manifold of the engine. When there is fault in the booster, enough vacuum is reserved to help with two or three brake application, additional pressure is then required in the hydraulic brake system. Different kinds of power brake boosters consist of Delco-Moraine and Bendix, and both works on the same mechanism. In case brakes are released and in the same time the engine is on, vacuum is present on the both sides of the power piston, simultaneously, the air filters enters and is stopped in the air valve. When the driver applies the brake, pressing the brake pedal, the push rod gets translated, which leads to the admission of atmospheric air and consequent forward stroke of the power piston that redistributes the oil in the hydraulic master cylinder and at the same time feeds back to the driver. Namely, the power piston remains in that position once the desired level of braking force has been developed; the brake pedal pressure will alter it. Letting go of the pedal pressure opens the air valve and it comes into contact with the power piston, thus sealing the admission of atmospheric air, and also resets the power piston to its original position which then releases the hydraulic pressure. In case of vacuum failure, the brake pedal is useable for emergency braking, which demands higher pressure much as standard brake system. This involves the examination of hoses and the air filter of the power brake unit The dismantling of a power brake unit can be best done, with power brake special tools while it is more advisable to replace power brake unit than overhaul it, after a fault has been discovered.
BOOSTER
25511548
Q: What is the function and operation of a power brake booster on Chevrolet El Camino?
A: A power brake booster is standard across all models and came with the vacuum system derived from the manifold of the engine. Ideally, vacuum is accumulated in case of a failure in the booster to manage two or three brake applications after which more force such as in any hydraulic system is applied to the brake pedal. Other types of power brake boosters are the Delco-Moraine and Bendix boosters and both work in a similar manner. When the brakes are released the vacuum is possible on both sides of the power piston, the air through the filter enters, and in turn, any air in the circuit is drawn through a narrow passage and into the intake manifold by means of a check valve. When the brake pedal is pressed, this pushes the push rod that in turns moves the air valve thus opens to allow air from the environment into the housing so as to motivate the power piston to operate the hydraulic master piston. As pressure increases the hydraulic reaction plate comes in contact with the reaction levers to feedback to the pedal that the degree of brake has been applied for the driver to feel. When the required braking force has been realized, the power piston stops moving in case of alteration of pressure on the pedal. Venting pedal pressure returns the air valve to engage the power piston thus sealing off supply of atmospheric air and with the help of piston, the hydraulic pressure inside the brake system is relieved by receding into the rear housing. Should there be vacuum failure for instance when the engine is off or when there is a bad vacuum line then the brake pedal can still be applied though at a higher pedal pressure that a normal system. The power brake unit does not need any special degree of maintenance, apart from the inspection of the hoses and the air filter located beneath the boot on the side of the push rod from the pedal. Removal of the power brake unit requires special tools and it is best to get a new or re-manufactured unit as replacement on the occurrence of a problem if not warrantied by the company.

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