GM Service Manual Online
For 1990-2009 cars only

Power Brake Booster Replacement Non-Adjustable Pedals


Object Number: 1850420  Size: MF

Callout

Component Name

Caution: Hydraulic brake systems use two distinct and incompatible fluids. Power steering fluid is used in the hydraulic brake booster system. Brake fluid is used in the master cylinder and brake pipes. Use extreme care when selecting brake system fluids, or seal damage can result. Refer to General Information to select the correct fluid.

Preliminary Procedures

  1. Apply the park brake.
  2. Deplete the power reserve in the brake booster by applying the brake pedal several times until the pedal becomes firm.
  3. Without disconnecting the brake pipes, remove and position the brake master cylinder aside and support with heavy mechanics wire or equivalent. Refer to Master Cylinder Replacement.

1

Brake Booster Pushrod Retainer Bolt

Caution: Refer to Fastener Caution in the Preface section.

Tighten
10 N·m (89 lb in)

2

Brake Booster Pushrod Retainer

3

Stop Lamp Switch

4

Brake Booster Pushrod

5

Brake Booster Nut (Qty: 4)

Tip
Tighten the upper right power brake booster nut first.

Tighten
33 N·m (24 lb ft)

6

Power Brake Booster Return Hose Clamp

7

Power Brake Booster Return Hose

8

Power Brake Booster Outlet Hose Fitting

Tighten
33 N·m (24 lb ft)

9

Power Brake Booster Inlet Hose Fitting

Tighten
33 N·m (24 lb ft)

10

Power Brake Booster

Procedure

  1. Inspect the power brake booster gasket for damage. Replace if necessary.
  2. Bleed the power steering system. Refer to Power Steering System Bleeding.

Power Brake Booster Replacement Adjustable Pedals


Object Number: 1850421  Size: MF

Callout

Component Name

Caution: Hydraulic brake systems use two distinct and incompatible fluids. Power steering fluid is used in the hydraulic brake booster system. Brake fluid is used in the master cylinder and brake pipes. Use extreme care when selecting brake system fluids, or seal damage can result. Refer to General Information to select the correct fluid.

Preliminary Procedures

  1. Apply the park brake.
  2. Deplete the power reserve in the brake booster by applying the brake pedal several times until the pedal becomes firm.
  3. Without disconnecting the brake pipes, remove and position the brake master cylinder aside and support with heavy mechanics wire or equivalent. Refer to Master Cylinder Replacement.

1

Brake Booster Pushrod Retainer Bolt

Caution: Refer to Fastener Caution in the Preface section.

Tighten
10 N·m (89 lb in)

2

Brake Booster Pushrod Retainer

3

Stop Lamp Switch

4

Power Brake Booster Pushrod

5

Brake Booster Nut (Qty: 4)

Tip
Tighten the upper right power brake booster nut first.

Tighten
33 N·m (24 lb ft)

6

Power Brake Booster Return Hose Clamp

7

Power Brake Booster Return Hose

8

Power Brake Booster Outlet Hose Fitting

Tighten
33 N·m (24 lb ft)

9

Power Brake Booster Inlet Hose Fitting

Tighten
33 N·m (24 lb ft)

10

Power Brake Booster

Procedure

  1. Inspect the power brake booster to cowl gasket for damage. Replace if necessary.
  2. Bleed the power steering system. Refer to Power Steering System Bleeding.