Air-Consuming Devices in Use

wv mm 32.01.003

Follow the procedure below to determine if a pressure drop in the rear air suspension system is within the allowable range.

Note: With the service brakes applied and the parking brake released (pressurized), pressure drop must not exceed 3 psi (21 kPa) in one minute.
  1. Park the vehicle on a level surface, place the transmission in Neutral (N), and chock the tires to prevent the vehicle from rolling.
  2. Turn off all air-consuming devices.
  3. Run the engine until the air system reaches full pressure.
    4. Note: The minimum compressor cut-out pressure is 110 psi (758 kPa).
  4. Release the parking brake.
  5. Shut down the engine, apply the brake pedal fully, and wait one minute for the air pressure to stabilize. Note the reading on the air pressure gauge.
  6. Wait one additional minute (with the brake pedal fully applied) and check the gauge reading again to see if there has been any pressure drop.
  7. Pressure drop from air leakage must be less than 3 psi (21 kPa).
Note:
Parent topic: Rear Air Suspension
Document Number: 0000119230
Manual Publication Date: 2024-05-14
Topic Publication Date: 2024-11-19