GM 22701249
Pressure Metering Valve

Begin the brake proportioning valve replacement process by taking away the battery tray and making a note of brake pipe placement. Unplug the brake pipes from both sides and the 4 brake pipes from the proportioning valve by placing bleeder valve caps on the connectors to stop brake fluid loss and keep out contaminants. Support the vehicle using a proper hoist at the given height and remove the left inner fender shield below. Unfasten the two bolts securing the proportioning valve bracket before taking out the complete assembly. Attach the proportioning valve assembly to the vehicle and fasten it with the 2 bracket bolts up to 24 Nm (18 ft. lbs.). Replacement of the shield should happen after you lower the car. Make sure brake pipes attach to the brake pressure modulator valve properly to avoid wheel lockup which test results come from a Scan Tool or by performing an Antilock stop. Fit both brake pipes into the proportioning valve openings and attach the 4 brake pipes. Secure all brake pipe connections using a torque of 23 Nm. Put back the battery tray then release air from the brake system.

You need to unstall the air cleanup unit before starting this job. Mark the brake pipe positions before you install. Twist off both brake pipes and fit bleeder valve caps to their ends to stop brake fluid leakage and protect the systems. The process continues with separating all 4 brake pipes and sealing their tips with bleeder valve caps. Lift the vehicle with a suitable stand and take off the left inner fender shield. Unfasten two bolts securing the proportioning valve bracket then pull out the proportioning valve assembly. Install the proportioning valve assembly through its 2 bracket bolts and secure the bolts with 24 nm torque. Replace the left fender shield then let the vehicle down to the ground. Check if all brake pipes link properly to the brake pressure modulator valve to protect against wheel lock and hazards to workers. Confirm this performance through the scan tool or performing an antilock stop. Fasten all brake tubes to the proportioning valve with their caps and then link the two remaining brake tubes together before tightening the fittings to 23 nm (17 ft. Lbs.). End the task by reinstalling the air filter and properly bleeding the brake lines.

Remove the 2 proportioning valve bracket bolts and take out the proportioning valve assembly.