GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Hydraulic Brake Diagnostic System Check performed?

--

Go to Step 2

Go to the Hydraulic Brake Diagnostic System Check

2

Perform the brake pedal travel measurement procedure. Refer to Brake Pedal Travel .

Does the brake pedal travel exceed the specified measurement?

--

Go to Step 3

System OK

3

Inspect the brake linings for the following:

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

Refer to Brake Pad Inspection in Disc Brakes.

Do any of the above conditions exist?

--

Go to Step 4

Go to Step 5

4

Replace the brake linings as necessary.

    • Refer to Front Disc Brake Pads Replacement in Disc Brakes.
    • Refer to Rear Disc Brake Pads Replacement in Disc Brakes.

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

5

Inspect the brake rotors for the following:

    • Hot spots
    • Scored rotor surface
    • Grooved rotor surface
    • Excessive lateral runout

Refer to Brake Rotor Lateral Runout Check in Disc Brakes

Do any of the above conditions exist?

--

Go to Step 6

Go to Step 8

6

Resurface or replace the brake rotor as necessary. Refer to Brake Rotor Refinishing , Front Brake Rotor Replacement or Rear Brake Rotor Replacement in Disc Brakes.

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

7

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

8

Inspect the brake assembly for missing or loose attachments. Refer to Brake Pad Inspection in Disc Brakes

Are there any missing or loose attachments?

--

Go to Step 9

Go to Step 12

9

Repair or replace the components as necessary.

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

10

Inspect calipers for leakage.

Are any of the components leaking?

--

Go to Step 11

Go to Step 12

11

Replace the leaking components.

    • Repair or replace the FRONT brake calipers. Refer to Front Brake Caliper Overhaul or Front Brake Caliper Replacement in Disc Brakes.
    • Repair or replace the REAR brake calipers (export only). Refer to Rear Brake Caliper Overhaul or Rear Brake Caliper Replacement in Disc Brakes.

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

12

Inspect the hydraulic brake system for leaks. Refer to Brake Fluid Leak or Brake Hose Inspection. Refer to Brake Hose Inspection

Is there any sign of leakage?

--

Go to Step 13

Go to Step 14

13

Repair or replace the components as necessary.

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

14

Inspect the master cylinder for leakage. Refer to Brake Fluid Leak .

Is the master cylinder leaking?

--

Go to Step 15

Go to Step 16

15

Replace the master cylinder. Refer to Master Cylinder Replacement

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

16

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

Is there air in the system?

--

Go to Step 17

Go to Step 18

17

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

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

18

Inspect the brake fluid for contamination. Refer to Master Cylinder Reservoir Filling .

Is the brake fluid contaminated?

--

Go to Step 19

Go to Step 20

19

Replace all of the hydraulic brake system rubber components.

  1. Flush the hydraulic brake system. Refer to Hydraulic Brake System Flushing .
  2. Replace the ABS modulator. Refer to Brake Pressure Modulator Valve Replacement in Antilock Brake System.
  3. Repair or replace the master cylinder. Refer to Master Cylinder Overhaul .
  4. Replace the front brake hoses. Refer to Front Brake Hose Replacement .
  5. Replace the rear brake hoses. Refer to Rear Brake Hose Replacement .
  6. Repair or replace the FRONT brake calipers. Refer to Front Brake Caliper Overhaul or Front Brake Caliper Replacement in Disc Brakes.
  7. Repair or replace the REAR brake calipers. Refer to Rear Brake Caliper Overhaul or Rear Brake Caliper Replacement in Disc Brakes.
  8. Flush the hydraulic brake system. Refer to Hydraulic Brake System Flushing .

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

20

Verify the proper brake system operation.

Does the original condition still exist?

--

Go to Step 1

System OK