OEM 2007 GMC Acadia Brake Booster

2007 GMC Acadia Brake Booster Parts and Q&A

• Q: How to replace the vacuum brake booster on 2007 GMC Acadia?

  A: Start by putting the car on a flat surface then engage the parking brake before working on the replacement. When the engine is off press and let go of the brake pedal multiple times until the brake pedal feels solid to empty the vacuum storage. Pull out the air cleaner while disconnecting the service lamp for the master cylinder fluid sensor. First take off the vacuum Brake Booster check valve hose from the vacuum Brake Booster. Then disconnect its vacuum sensor electrical connector. Take off brake pipes from frame rail routing clip until removing 2 bpmv nuts without disconnecting the brake lines. Securely place the bpmv assembly forward on the studs before removing the cupped Brake Master Cylinder nuts which keep the brake pipes attached. Position the master cylinder assembly upright by hanging it with heavy wire during removal steps. First take off the knee bolster along with the brake pedal pushrod retaining clip and the left side instrument panel insulator panel. Take off the brake pedal pushrod by pulling its clevis pin and then remove all 4 vacuum Brake Booster nuts. Press the vacuum Brake Booster toward the front while elevating it until the mounting studs pass above the dash panel before you take out the Brake Booster. Before putting the booster in place you should check the vacuum Brake Booster to dash panel gasket for problems and replace it if found damaged. Install the vacuum Brake Booster studs on the dash panel and place the unit before installing all four nuts to 25 n.m (18 lb ft). Install the brake pedal pushrod onto its fitting on the pedal then insert the clevis pin. Apply the brake pedal pushrod retaining clip last. Put back the left side instrument panel insulator and knee bolster. Check the master cylinder seal to vacuum Brake Booster lay against the master cylinder flange rear side. Replace the seal if damaged before installation. Install the master cylinder to the booster and fasten its 2 nuts to 20 n.m (15 lb ft). Place the bpmv assembly over the studs before tightening the 2 nuts of the brake pressure modulator valve (BPMV) bracket assembly until they reach 20 n.m (15 lb ft). Establish the brake pipes to the routing clip on the frame and join the fluid level sensor wires to master cylinder plus vacuum sensor wires to the booster. The Brake Booster check valve hose installation requires a limited amount of denatured alcohol when needed but avoid using soap for this process. Reattach the vacuum Brake Booster check valve hose to its mating point before putting back the air cleaner assembly.