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.

Is the brake pedal components bent or misaligned?

--

Go to Step 2

Go to Step 3

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 10

--

4

Inspect the following hydraulic brake booster components for damage:

    • Input rod bent
    • Piston return spring broken
    • Spool valve return spring broken
    • Swollen or elongated seals

Do any of the above conditions apply?

--

Go to Step 5

Go to Step 6

5

Overhaul or replace the hydraulic brake booster. Refer to:

Is the repair complete?

--

Go to Step 10

--

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 10

--

8

Check the power steering pump return hose for a restriction.

Is the return line restricted?

--

Go to Step 9

System OK

9

Replace the hose.

Refer to Power Brake Booster Inlet Hose Replacement or Power Brake Booster Outlet Hose Replacement in Power Steering System.

Is the repair complete?

--

Go to Step 10

--

10

Verify proper brake system operation.

Does the original condition still exist?

--

Go to Step 1

System OK