Removal Procedure

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

The high pressure accumulator (HPA) and the chambers of the brake modulator assembly to which it attaches, store brake fluid at extremely high pressures. Fluid pressure must be relieved before attempting to service the HPA. Ensure that the recommended procedures are followed to relieve system pressure, including using the manual pressure release steps. Failure to properly follow procedures to depressurize the system may result in personal injury.

WARNING:

Refer to Brake Fluid Irritant Warning .

CAUTION:

Refer to Brake Fluid Effects on Paint and Electrical Components Caution .

NOTE:

The ignition must be in the OFF position, without pausing at ACCESSORY, and without applying the brake pedal to ensure the brake modulator and high pressure accumulator (HPA) pressure relief occurs. This process will take approximately 1 to 3 minutes.

Turn the ignition to OFF, without pausing at ACCESSORY, and remove the ignition key.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
Remove the brake pressure modulator valve assembly. Refer to Brake Pressure Modulator Valve Replacement .

Fig 1: Master Cylinder Return, Supply Hoses And O-ring Seals

Courtesy of GENERAL MOTORS CORP.

Remove the master cylinder return hose fitting (1).
Remove the master cylinder supply hose fitting (2).
Remove and discard the O-ring seals (3).

Fig 2: Brake Pipe Manifold Bolts

Courtesy of GENERAL MOTORS CORP.

Remove the brake pipe manifold bolts (1).

Fig 3: Brake Pipe Manifold

Courtesy of GENERAL MOTORS CORP.

Remove the brake pipe manifold (1).

Fig 4: Transfer Tubes & O-ring Seals

Courtesy of GENERAL MOTORS CORP.

Remove the 5 transfer tubes (1).
Remove and discard the 5 upper transfer tube O-ring seals (2).
Remove discard the 5 lower transfer tube O-rings seals (3).