GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Brake System Diagnosis?

--

Go to Step 2

Go to Brake System Diagnosis

2

Inspect the vehicle for overloading.

Is there excessive weight in the vehicle?

--

Go to Step 3

Go to Step 4

3

Remove the extra weight from the vehicle.

Does the original condition still exist?

--

Go to Step 4

System OK

4

Inspect the brake pedal assembly for the following conditions:

    • Bent or misaligned components
    • Binding or interference between the pedal and the booster input rod
    • Interference with other components

Are the components misaligned or binding?

--

Go to Step 5

Go Step 6

5

Repair or replace the cause of misalignment.

Did you complete the repair?

--

Go to Step 18

--

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 as necessary. Refer to the applicable procedure.:

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

Is the repair complete?

--

Go to Step 18

--

8

Inspect the brake rotors for the following conditions

    • Hot spots
    • Scored rotor surface

Refer to Brake Rotor Lateral Runout Check in Disc Brakes.

Do any of the above conditions exist?

--

Go to Step 9

Go to Step 10

9

Resurface or replace the brake rotor as necessary. Refer to the appropriate procedure:

    •  Brake Rotor Refinishing in Disc Brakes

Did you complete the repair?

--

Go to Step 18

--

10

Inspect the vehicle brake booster for the following conditions

    • Leaks
    • Damage
    • Restricted passages

Refer to Vacuum Booster Diagnosis .

Do any of the above conditions exist?

--

Go to Step 11

Go to Step 12

11

Repair or replace the brake booster. Refer to Power Vacuum Brake Booster Replacement .

Did you complete the repair?

--

Go to Step 18

--

12

Inspect the vehicle for a leaking master cylinder (internal). Refer to Master Cylinder Diagnosis .

Is the master cylinder leaking?

--

Go to Step 13

Go to Step 14

13

Repair or replace the master cylinder. Refer to the appropriate procedure:

    •  Master Cylinder Overhaul .

Did you complete the repair?

--

Go to Step 18

--

14

Inspect for leaking brake pipes, hoses or connections. Refer to Brake Hose and Pipe Diagnosis .

Are any of the above components leaking?

--

Go to Step 15

Go to Step 16

15

Repair the cause of the leak.

Did you complete the repair?

--

Go to Step 18

--

16

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 .

Do any of the above conditions exist?

--

Go to Step 17

Go to Step 18

17

  1. Determine the area of the restriction. This will involve the disassembly of the 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 applicable brake hose or the brake pipe.
  4. Flush the hydraulic brake system. Refer to Hydraulic Brake System Flushing .

Did you complete the repair?

--

Go to Step 18

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18

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2