GMC 13279639 Housing Assembly, Front Brake Caliper

To remove the caliper, start by loosening the lug nuts on the front wheels without fully removing them. Then, raise the front of the vehicle and secure it on jackstands before removing the front wheels. Next, disconnect the brake line from the caliper and plug it to prevent contamination and fluid loss. If you're only removing the caliper for access to other components, you can skip this step. Proceed by removing the caliper mounting bolts and detach the caliper from its mounting bracket. If the hose is still attached, hang the caliper using a wire to avoid putting strain on the brake hose. To install the caliper, follow the reverse order of the removal procedure. Make sure to replace the copper sealing washers on each side of the brake line fitting with new ones. Tighten the caliper mounting bolts and the brake line banjo fitting bolt according to the specified torque. After installation, bleed the brake system to remove any air. Finally, install the wheels and lug nuts, lower the vehicle, and tighten the wheel lug nuts to the specified torque.

If replacement is indicated due to fluid leakage or damage to a piston boot, it is recommended that the calipers be replaced rather than overhauled, as new and factory rebuilt units are available on an exchange basis, making the job easier. Always replace calipers in pairs and avoid replacing just one. When removing a caliper to access another component, do not disconnect the brake hose or parking brake cable on rear calipers. Begin by loosening the wheel lug nuts, raising the vehicle, and securely supporting it on jackstands before removing the wheels. For models with an Electronic Parking Brake, place the parking brake actuators in service mode, and for those with parking brake cables, detach the cables from the calipers. Next, remove the banjo fitting bolt and disconnect the brake hose from the caliper, discarding the sealing washers and plugging the hose to prevent contamination and fluid loss. If the caliper is only being removed for access, use wire to hang it securely and avoid letting it hang by the brake hose. To remove the caliper mounting bracket, first take out the brake pads, then remove and discard the two caliper bracket mounting bolts, cleaning the mating surfaces and removing any remaining thread locking material. Installation follows the reverse order of removal, using a high-temperature thread locking compound on the fastener threads and installing new caliper mounting bracket bolts, tightening them to the specified torque. Always use new sealing washers when reinstalling the banjo fitting to the caliper. If the brake hose was disconnected, bleed the brake system and ensure there are no leaks from the hose connections, testing the brakes carefully before returning the vehicle to normal service. If work was done on the rear calipers, adjust the parking brake for models with parking brake cables, and enable the parking brake system for those with an Electronic Parking Brake.

Disconnect the brake line from the caliper and plug it to prevent contamination and fluid loss. If you're only removing the caliper for access to other components, you can skip this step.