GM 15881645
Pressure Metering Valve

First raise and stabilize the vehicle with safety stands to replace its combination valve. Disconnect the electrical plug from the combination valve before separating its lines to front and back brakes. Pull out the bolt that holds the combination valve to the frame and take the valve out. Place the combination valve onto the frame and thread in the bolt before tightening it to 10 nm (88 inch lbs.). Secure the front and rear brake pipes to their connections at the combination valve using moderate force of 30 nm. Reattach the electric connector to the combination valve then use the proper procedure to remove air from the brake lines.

Before replacing the combination valve, you should raise the vehicle and use safety stands to hold it. Take off the electrical connector from the combination valve, then unplug the front and rear brake pipes. Take out the bolt that holds the combination valve in place and remove the valve. Set the combination valve onto the frame and put in the bolt, tighten it until you reach 10 nm (89 lb in). Tighten the front and rear brake pipes onto the valve with 30 nm (22 lb ft) of torque and then reconnect the electrical connection. At the end, make sure to bleed the brake system in the right way.

You must put the vehicle on jacks before replacing the brake combination valve. Take off the electrical connector from the valve then disconnect both brake lines from its ends. Take off the combination valve bolt and place the combination valve out of the vehicle. Place the combination valve onto the frame in its proper location while following security measures pointed out for fasteners. Mount the combination valve bolt and fasten it with 10 nm (89 lb in) torque. Connect the brake pipes from front and rear to the combination valve and fasten its fittings at 30 nm (22 lb ft). Also reconnect the electrical connector. Conclude the hydraulic brake system maintenance process according to proper bleeding rules.