For 1990-2009 cars

### Removal Procedure

In order to repair or replace the National air suspension seat components, refer to the manufacturer's literature accompanying the vehicle at the time of purchase.

1. Drain all air reservoirs. Refer to Draining Reservoirs in Air Brakes.
2. Remove the air line from the elbow or from the tee.
3. Remove the seat belt bracket bolt.
4. Remove the bracket nut and washer, if equipped.
5. Remove the seat belt from the buckle side bolt.
6. Remove the seat belt buckle side from the buckle side of the vehicle.
7. Remove the air suspension seat bolts. DISCARD the air suspension seat bolts.
8. Remove the air suspension seat from the vehicle.
9. Remove the seat bolt sealers. DISCARD the seat bolt sealers.

### Installation Procedure

1. Install the NEW seat bolt sealers.
2. Install the air suspension seat in the vehicle.

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.

3. Install the NEW air suspension seat bolts.

Tighten
Tighten the bolts to 55 N·m (41 lb ft).

4. Install the seat belt bracket bolt.
5. Install the seat belt bracket nut and washer, if equipped.
6. Install the seat belt on the buckle side of the vehicle.
7. Install the seat belt to the buckle side bolt.

Tighten

• | Tighten the high back seat belt bracket bolt to 90 N·m (66 lb ft).

• | Tighten the low back seat belt bracket bolt to 40 N·m (30 lb ft).

8. Install the air line to the elbow or the tee.
9. Start the engine and charge the air system to the air compressor governor valve cut-out point. Refer to Filling Reservoirs in Air Brakes.