GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Hydraulic Brake Diagnosis System Check performed?

--

Go to Step 2

Go to Hydraulic Brake Diagnostic System Check

2

Inspect the disc brake rotors for the following:

    • Hot spots
    • Scored rotor surface
    • Grooved rotor surface

Refer to Brake Pad Inspection in Disc Brakes.

Do any of the above conditions apply?

--

Go to Step 2

Go to Step 3

3

  1. Resurface the brake rotor. Refer to Brake Rotor Refinishing in Disc Brakes.
  2. Check the thickness of the rotor. Refer to Component Specifications in Disc Brakes.
  3. If refinishing the brake rotor results in a thickness that is less than the thinnest (Refinishing) thickness, replace the rotor. Refer to Brake Rotor Replacement in Disc Brakes.

Is the repair complete?

--

Go to Step 24

--

4

Inspect the following brake caliper assembly components for corrosion:

    • Mounting bolts
    • Sleeves
    • Steering knuckle
    • Brake caliper
    • Brake caliper piston

Refer to Brake Caliper Inspection in Disc Brakes.

Are any of the above components corroded or sticking?

--

Go to Step 5

Go to Step 6

5

Repair or replace calipers. Refer to Brake Caliper Overhaul or Brake Rotor Replacement in Disc Brakes.

Is the repair complete?

--

Go to Step 24

--

6

Inspect the disc brake pads and brake shoe linings for the following:

    • Excessive wear
    • Uneven wear
    • Abuse
    • Glazing
    • Contaminated lining material
    • Incorrect lining material

Refer to Brake Pads Replacement in Disc Brakes or Brake Shoe Replacement in Drum Brakes.

Do any of the above conditions apply?

--

Go to Step 7

Go to Step 8

7

Replace the brake linings. Refer to Brake Pads Replacement in Disc Brakes or Brake Shoe Replacement in Drum Brakes.

Is the repair complete?

--

Go to Step 24

--

8

Inspect the brake assembly for loose, missing or broken components. Refer to Brake Pad Inspection in Disc Brakes or Brake Shoe Inspection in Drum Brakes.

Are there missing or loose brake assembly components?

--

Go to Step 9

Go to Step 10

9

Tighten or replace loose or missing brake assembly components. Refer to Brake Pads Replacement in Disc Brakes or Brake Shoe Replacement in Drum Brakes.

Is the repair complete?

--

Go to Step 24

--

10

Inspect the hydraulic brake system for leaks. Refer to Brake Fluid Leak and Brake Hose and Pipe Diagnosis in Hydraulic Brakes.

Are there brake fluid leaks?

--

Go to Step 11

Go to Step 12

11

Tighten the brake hose or pipe fittings. Refer to Fastener Tightening Specifications .

Is the repair complete?

--

Go to Step 24

--

12

Inspect the brake caliper piston seal for leaks.

Is the brake caliper piston seal leaking?

--

Go to Step 13

Go to Step 14

13

Replace the brake caliper piston seal. Refer to Brake Caliper Overhaul in Disc Brakes.

Is the repair complete?

--

Go to Step 24

--

14

Inspect the park brake for improper adjustment.

Is the park brake improperly adjusted?

--

Go to Step 15

Go to Step 16

15

Adjust the park brake cable. Refer to Park Brake Cable Service/Adjustment in Park Brake.

Is the repair complete?

--

Go to Step 24

--

16

Inspect for an internal leak within the master cylinder. Refer to Master Cylinder Diagnosis .

Is there an internal leak within the master cylinder?

--

Go to Step 17

Go to Step 18

17

Overhaul or replace the master cylinder. Refer to Master Cylinder Overhaul or Master Cylinder Replacement .

Is the repair complete?

--

Go to Step 24

--

18

Inspect for contaminated or improper brake fluid. Refer to Brake Fluid and Brake Fluid Handling .

Is the brake fluid contaminated or improper?

--

Go to Step 19

Go to Step 20

19

Flush the brake system. Refer to Hydraulic Brake System Flushing .

Is the repair complete?

--

Go to Step 24

--

20

Inspect the brake pipes and hoses for a restricted brake fluid passage. Check for the following:

    • Low fluid or no fluid output
    • Spurting of fluid while pressing the brake pedal
    • Particles suspended in the fluid

Refer to Master Cylinder Bench Bleeding .

Is there a restricted brake fluid passage?

--

Go to Step 21

Go to Step 22

21

  1. Determine the area of the restriction. This will involve the disassembly of individual brake lines and checking for low or no fluid output.
  2. Flush the individual brake line or hose. Refer to Hydraulic Brake System Flushing .
  3. If the restriction cannot be removed, replace the brake line or hose as necessary. Refer to:
  4. Flush the hydraulic brake system. Refer to Hydraulic Brake System Flushing .

Is the repair complete?

--

Go to Step 24

--

22

Inspect for air in the brake system. Refer to Hydraulic Brake System Bleeding .

Is there air in the brake system?

--

Go to Step 23

System OK

23

Bleed the brake system. Refer to Hydraulic Brake System Bleeding .

Is the repair complete?

--

Go to Step 24

--

24

Verify proper brake system operation.

Does the original condition still exist?

--

Go to Step 1

System OK