GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Hydraulic Brake System Diagnostic Check performed?

--

Go to Step 2

Go to Hydraulic Brake Diagnostic System Check

2

Inspect the tires for incorrect pressure. Refer to Tire Inflation Pressure Specifications in Maintenance and Lubrication.

Is the tire pressure incorrect?

--

Go to Step 3

Go to Step 4

3

Adjust the tires to the correct pressure. Refer to Tire Inflation Pressure Specifications in Maintenance and Lubrication.

Is the repair complete?

--

Go to Step 22

--

4

Inspect the front suspension for loose components.

Are there loose components?

--

Go to Step 4

Go to Step 5

5

Tighten the loose components. Refer to Fastener Tightening Specifications in Front Suspension.

Is the repair complete?

--

Go to Step 22

--

6

Inspect the brake linings for the following conditions:

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

Refer to Brake Pad Inspection in Disc Brakes.

Do any of the above conditions apply?

--

Go to Step 7

Go to Step 8

7

Replace the brake linings. Refer to the appropriate procedure:

    •  Front Disc Brake Pads Replacement in Disc Brakes
    •  Rear Disc Brake Pads Replacement in Disc Brakes

Is the repair complete?

--

Go to Step 22

--

8

Inspect the brake rotor for the following conditions:

    • Hot spots
    • Scored rotor surface
    • Grooved rotor surface
    • Excessive surface variations

Refer to the following procedures:

    •  Brake Rotor Thickness Variation Check in Disc Brakes
    •  Brake Rotor Lateral Runout Check in Disc Brakes
    •  Brake Rotor Tolerance in Disc Brakes

Do any of the above conditions apply?

--

Go to Step 9

Go to Step 10

9

    Important: If refinishing the brake rotor results in a thickness that is less than the thinnest (Refinishing) thickness, replace the rotor. Refer to Front Brake Rotor Replacement or Rear Brake Rotor Replacement in Disc Brakes.

  1. Refinish the brake rotor. Refer to Brake Rotor Refinishing in Disc Brakes.
  2. Inspect the thickness of the rotor. Refer to Component Specifications in Disc Brakes.

Is the repair complete?

--

Go to Step 22

--

10

Inspect the brake assembly for loose, broken or missing components.

Are there any loose, broken or missing brake assembly components?

--

Go to Step 11

Go to Step 12

11

Tighten or replace loose or missing brake assembly components.

Is the repair complete?

--

Go to Step 22

--

12

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 13

Go to Step 14

13

Replace the corroded components.

Is the repair complete?

--

Go to Step 22

--

14

Inspect the park brake cable. Refer to Park Brake Cable Inspection in Park Brake.

Is the park brake adjusted improperly?

--

Go to Step 15

Go to Step 16

15

Replace the park brake cable. Refer to the appropriate procedure:

Is the repair complete?

--

Go to Step 22

--

16

Inspect the front suspension for incorrect alignment. Refer to Fastener Tightening Specifications in wheel Alignment.

Is the wheel alignment incorrect?

--

Go to Step 17

Go to Step 18

17

Correct the front wheel alignment. Refer to Fastener Tightening Specifications .

Is the repair complete?

--

Go to Step 22

--

18

Inspect for contaminated or improper brake fluid.

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 22

--

20

Inspect the brake pipes and hoses for the following conditions:

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

Refer to Hydraulic Brake System Flushing .

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

Is the repair complete?

--

Go to Step 22

--

22

Verify proper brake system operation.

Does the brake system operate properly?

--

System OK

Go to Hydraulic Brake Diagnostic System Check