GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 GMC C-Series Medium Duty Truck B7 🢒 Brakes 🢒 Air Brakes 🢒 Automatic Level Control Air Dryer Replacement

Removal Procedure
  1. Apply the parking brake.
  2. Block the wheels.
  3. Drain the reservoirs. Refer to Draining Reservoirs .
  4. Remove the air lines.

    5. Object Number: 201587 Size: SH
  5. Remove the wiring harness connector.

    6. Object Number: 201592 Size: SH
  6. Remove the following components:
    7. • The nuts
    • The washers
    • The bolts
  7. Remove the air dryer.

Installation Procedure
  1. Install the air brake dryer.

    2. Object Number: 201592 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2. Install the following components:
    3. • The bolts
    • The washers
    • The nuts

    Tighten
    Tighten the air dryer nuts to 45 N·m (33 lb ft).

  3. Install the air lines.
  4. Install the air dryer pipe nuts and the pipes.
  5. Install the wiring harness connector.
  6. Start the engine.
  7. Charge the system air pressure to the governor cut-out point.
  8. Check for air leaks with a soap solution.
  9. Check for the proper brake operation.
  10. Remove the wheel blocks.