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 brake pedal assembly for bent or misaligned components.

Are the brake pedal components bent or misaligned?

--

Go to Step 3

Go to Step 4

3

  1. Disassemble and realign components as necessary.
  2. Replace the brake pedal assembly. Refer to Brake Pedal Replacement .

Is the repair complete?

--

Go to Step 9

--

4

Inspect the vacuum brake booster for a bent input rod.

Is the input rod bent?

--

Go to Step 5

Go to Step 6

5

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

Is the repair complete?

--

Go to Step 9

--

6

Inspect the master cylinder for swollen or elongated primary piston seals. Refer to Master Cylinder Diagnosis .

Are the master cylinder seals swollen or elongated?

--

Go to Step 7

Go to Step 8

7

Overhaul the master cylinder. Refer to Master Cylinder Overhaul .

Is the repair complete?

--

Go to Step 9

--

8

Verify that the brake pedal is slow to return.

Is the brake pedal slow to return?

--

Go to Step 5

Go to Step 9

9

Verify proper brake system operation.

Does the brake system operate properly?

--

System OK

Go to Hydraulic Brake Diagnostic System Check