BENDIX TCH-002-006 User Manual

Technical Bulletin

Bulletin No: TCH-002-006 Effective Date: 11/1/2007 Cancels: N/A Page: 1 of 2

Subject: Bendix

The following procedure is for manually caging and/or un-caging (releasing) a Bendix® Air Disc Brake Spring Brake Actuator.

Service Housing

Push Rod

Figure 1a - Spring brake shown in the caged position.

Un-Caging (releasing) the Parking Brake

1) Install the spring brake actuator on the air disc brake (if not previously installed). Refer to service data sheet SD-23-7541 (BW7308). See Figure 1b.

2) Connect a regulated air line to parking brake port (12) of the actuator (if not connected previously). See Figure 1a.

3) Gradually supply 100 psi of air pressure to the parking brake port (12) of the actuator.

4) Rotate the release bolt clockwise until resistance is encountered.

5) Seat the release bolt in the un-caged position by applying a torque of 50 lb-ft. The release bolt and push rod should be in the position shown in Figure 2.

6) With hands clear of moving parts, slowly release the air pressure to the parking brake port (12). Be sure to exercise caution to prevent pinching of ﬁ ngers.

Air Disc Brake Spring Brake Actuator Caging Procedure

Spring Brake Housing

Release Bolt

Parking Brake (12)

Service Port (11)

Figure 1b - Air disc brake assembly

Spring Brake

Housing

Service

Housing

Push Rod

Parking Brake (12)Service Port (11)

Figure 2 - Spring brake shown in the un-caged (released) position.

Release Bolt

(over)

Caging the Parking Brake

1) Connect a regulated air line to parking brake port (12) of the actuator (if not connected previously).

2) Gradually supply 100 psi of air pressure to the parking brake port (12) of the actuator.

3) Rotate the release bolt counterclockwise until resistance is encountered.

4) Seat the release bolt in the caged position by applying torque of 25 lb-ft. The release bolt and push rod should be in the position shown in Figure 1a.

5) With hands clear of moving parts, slowly release the air pressure to the parking brake port (12). Be sure to exercise caution to prevent pinching of ﬁ ngers.

Notes As always, follow all recommended safety procedures when performing any service on your vehicle.

1) The release bolt cannot be removed from the parking brake.

2) The nut is permanently attached to the release bolt.

3) Unless a vehicle must be moved in an emergency situation, NEVER ATTEMPT to Cage or Un-Cage the parking brake without applying air pressure (100 psi) to the parking brake port (12). This practice may damage the caging bolt and/or the parking brake which could result in the need to replace the spring brake actuator.

4) DO NOT USE an impact wrench to rotate the caging bolt.

5) Please refer to service data sheet SD-23-7541 (BW7308) for complete service instructions for Air Disc Brakes

products from Knorr Bremse, Bendix and Bendix Spicer Foundation Brake.