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

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

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

Refer to Brake Drum Inspection in Disc Brakes or Brake Pad Inspection in Drum Brakes.

Do any of the above conditions exist?

--

Go to Step 3

Go to Step 4

3

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

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

4

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 5

Go to Step 6

5

  1. Resurface the brake rotor. Refer to Brake Rotor Refinishing in Disc Brakes.
  2. 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 the Hydraulic Brake Diagnostic System Check

--

6

Inspect the drum brakes for improper adjustment. Refer to Drum Brake Adjustment in Drum Brakes.

Are the brakes improperly adjusted?

--

Go to Step 7

Go to Step 8

7

Adjust the drum brakes properly. Refer to Drum Brake Adjustment in Drum Brakes.

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

Are there any missing or loose attachments?

--

Go to Step 9

Go to Step 10

9

Replace or tighten the attachments as necessary.

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

10

Inspect the wheel cylinders and calipers for leakage.

Are any of the components leaking?

--

Go to Step 11

Go to Step 12

11

Replace the leaking components. Refer to Brake Caliper Replacement in Disc Brakes or Brake Drum Replacement in Drum Brakes.

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

12

Inspect the hydraulic brake system for leaks.

Is there any sign of leakage?

--

Go to Step 13

Go to Step 14

13

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

Is the repair complete?

--

Go to the Hydraulic Brake Diagnostic System Check

--

14

Inspect the master cylinder for leakage. Refer to Master Cylinder Diagnosis .

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

  1. Replace all rubber brake system components. Refer to the following procedures:
  2. •  Brake Caliper Replacement in Disc Brakes
    •  Wheel Cylinder Overhaul in Drum Brakes
  3. 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