For 1990-2009 cars

### Air Brake Chamber

Rear air brake chambers must be free to breathe through the pushrod opening and 4 equally spaced holes near the clamping flange. Make sure these openings are clear.

#### Leakage Test

1. Block the wheels.
2. Start the engine.
3. Charge the air system to the air compressor governor valve cut-out point.
4. Stop the engine.
5. Have an assistant apply and hold the brake pedal.
6. Apply a soap solution around the air brake chamber clamp and the breather holes.
7. Verify that no bubbles appear.

• | Lightly tap on the clamp and tighten the clamp bolts if bubbles appear.

• | Overhaul or replace the rear air brake chamber if the bubbles continue. Refer to Front Air Brake Chamber Overhaul or Rear Air Brake Chamber Overhaul .

8. Set the parking brake.
9. Remove the wheel blocks.