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

Perform the Accumulator Leak-Down test. Refer to Accumulator Leak-Down Test .

Did the accumulator pass the leak-down test?

--

Go to Step 4

Go to Step 3

3

Replace the accumulator. Refer to Hydraulic Brake Booster Accumulator Replacement .

Is the repair complete?

--

Go to Step 7

--

4

Inspect the following power steering system components for comtamination:

    • Power steering gear
    • Power steering pump
    • Hydraulic brake booster
    • Power steering hoses

Is the power steering system fluid contaminated?

--

Go to Step 5

Go to Step 6

5

  1. Flush the power steering system. Refer to Power Steering System Flushing in Power Steering System.
  2. Replace the hydraulic brake booster. Refer to Power Brake Booster Replacement

Is the repair complete?

--

Go to Step 7

--

6

Replace the hydraulic brake booster. Refer to Power Brake Booster Replacement .

Is the repair complete?

--

Go to Step 7

--

7

Verify proper brake system operation.

Does the original condition still exist?

--

Go to Step 1

Go to Hydraulic Brake Diagnostic System Check