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

Verify the operator is not riding the brake pedal.

Is the operator riding the brake pedal?

--

Go to Step 3

Go to Step 4

3

Advise the customer of the proper braking procedures.

Has the customer been advised of the proper braking procedures?

--

Go to Step 22

--

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 to Step 6

5

Repair or replace the cause of the misalignment, interference or binding. Refer to Brake Pedal Replacement .

Is the repair complete?

--

Go to Step 22

--

6

Inspect the brake linings for the following conditions:

    • Excessive wear
    • Uneven wear

Refer to Brake Pad Inspection in Disc Brakes or Brake Shoe Inspection 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 the appropriate procedure:

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

Is the repair complete?

--

Go to Step 22

--

8

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

Are there any loose or missing attachments?

--

Go to Step 9

Go to Step 10

9

Tighten or replace loose or missing components as necessary.

Is the repair complete?

--

Go to Step 22

--

10

Inspect for an improperly adjusted park brake. Refer to Park Brake Cable Service/Adjustment or Parking Brake Shoe Adjustment in Park Brake.

Is the park brake improperly adjusted?

--

Go to Step 11

Go to Step 12

11

Adjust the park brake. Refer to Park Brake Cable Service/Adjustment or Parking Brake Shoe Adjustment in Park Brake.

Is the repair complete?

--

Go to Step 22

--

12

Inspect the front suspension for loose or missing attachments. Refer to Fastener Tightening Specifications in Front Suspension.

Are there any loose or missing components?

--

Go to Step 13

Go to Step 14

13

Tighten or replace the loose or missing attachments. Refer to Fastener Tightening Specifications in Front Suspension.

Is the repair complete?

--

Go to Step 22

--

14

Inspect the disc brake caliper for the following conditions:

    • Sticking caliper pistons
    • Corroded mounting bolts.

Refer to Brake Caliper Inspection in Disc Brakes.

Do any of the above conditions exist?

--

Go to Step 15

Go to Step 16

15

Replace the components. Refer to the appropriate procedure:

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

Is the repair complete?

--

Go to Step 22

--

16

Inspect the brake fluid for contamination. Refer to Brake Fluid and Brake Fluid Handling .

Is the brake fluid contaminated?

--

Go to Step 17

Go to Step 18

17

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

Is the repair complete?

--

Go to Step 20

--

18

Inspect the brake pipes and brake hoses for the following conditions:

    • Low fluid or no fluid output
    • Particles suspended in the fluid

Refer to Hydraulic Brake System Flushing .

Do any of the above conditions exist?

--

Go to Step 19

Go to Step 20

19

  1. Determine the area of 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 hose or pipe as necessary. Refer to the appropriate procedure:
  4. Flush the hydraulic brake system. Refer to Hydraulic Brake System Flushing .

Is the repair complete?

--

Go to Step 22

--

20

Verify the brakes drag or do not release at all wheels.

Do the brakes drag or not release at all wheels?

--

Go to Step 21

Go to Step 22

21

Replace the vacuum brake booster. Refer to Power Vacuum Brake Booster Replacement .

Is the repair complete?

--

Go to Step 22

--

22

Verify the brake system operation. Does the brake system operate properly?

--

System OK

Go to Hydraulic Brake Diagnostic System Check