Preventive Maintenance, Servicing and Cleaning

5.Following the vehicle manufacturer’s recom- mended procedures, deactivate the electrical sys- tem in a manner that safely removes all electrical power from the vehicle.

6.Never exceed manufacturer’s recommended pres- sures.

7.Never connect or disconnect a hose or line con- taining pressure; it may whip. Never remove a com- ponent or plug unless you are certain all system pressure has been depleted.

8.Use only genuine Bendix® replacement parts, com- ponents and kits. Replacement hardware, tubing, hose, fittings, etc. must be of equivalent size, type and strength as original equipment and be de- signed specifically for such applications and sys- tems.

9.Components with stripped threads or damaged parts should be replaced rather than repaired. Do not attempt repairs requiring machining or weld- ing unless specifically stated and approved by the vehicle and component manufacturer.

10.Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition.

PREVENTIVE MAINTENANCE

Because no two vehicles operate under identical conditions, maintenance intervals will vary. Experience is a valuable guide in determining the best maintenance interval for a vehicle. As a recommended minimum, every 12 months, 100,000 miles or 3,600 operating hours, perform the Operational and Leakage Tests noted below. Inspect the filter for unrestricted airflow and blockage from debris collection. Remove the filter assembly and clean as needed. If the unit cannot be cleaned of debris, replace the filter. There are no serviceable parts within the assembly.

SERVICING AND CLEANING

1.Identify the control line to the trailer ABS modulator or spring brake relay valve. Disconnect the control line and remove the filter from the control port.

2.With the AF-3™in-line filter removed, apply shop air to the delivery port of the filter to clean the debris from the filter screen.

NOTE: Disassembly/reassembly of the AF-3™in-line filter is not recommended. If an assembly does not meet the Operational and Leakage Tests, it should be replaced with a new AF-3™in-line filter.

3.Clean the contaminants from the control line by applying shop air to the control line at the gladhand. If the trailer is connected to the tractor, build system pressure and make a light brake application. Caution: Pressurized debris can cause bodily injury, be sure the area around the trailer is vacated before performing this operation.

ECU

CONTROL

PORT

Figure 2 - Trailer Antilock Modulator

4.Apply thread sealant (do not use Teflon tape) to the male threads of the control line and the AF-3™in-line filter.

5.Install the filter in the control port of the ABS modulator or spring brake relay valve. Torque the filter body in place to approximately 10 pound-feet.

6.Connect the control line to the supply port of the AF-3™in-line filter.

OPERATIONALAND LEAKAGE TESTS

Apply the brakes and hold 20 psi pressure to the line. Apply a soap solution to the threads to check for leakage. A one- inch bubble in 5 seconds is permitted. Repair any excessive leaks. Perform the Service Check before placing the vehicle in service.

SERVICE CHECK

Apply and release air pressure to the control line containing the filter. The AF-3™in-line filter should allow delivery and exhausting of the pressure without any noticeable delay in service brake response. A delay can be identified by making a service brake application and viewing the actuator push rods. A delay may indicate foreign material is present in the control line, preventing the proper flow of air. If a delay is found, clean or replace the AF-3™in-line filter.