BENDIX TCH-013-017 User's Manual
Contents
1. Bulletin No TCH 013 017 Effective Date 7 30 08 Technical Bulletin i n Page 1 of 2 Cancels N A Subject Protect Your Bendix ATR 1 ATR 2 and R 14 Relay Valves from De icing Chemicals Vehicles exposed to harsh winters de icing and or other chemical sprays often experience excessive corrosion and contamination As a result these vehicles typically need maintenance more often and vehicle parts exposed to de icing chemicals tend to require replacement sooner For air system components one potential result of exposure to corrosion and contamination can be restricted or blocked exhaust ports which can reduce air system performance Regular maintenance routines typically include in spections for corrosion and contamination Air control valves with smaller secondary exhaust ports such as the Bendix ATR 1 or ATR 2 traction control valves and R 14 relay valves See Figure 1 are especially important to check These valves are often situated in difficult to reach locations on the vehicle however by following the steps outlined in this Bulletin the technician can verify that the valves are functioning correctly Bendix recommends that potentially affected vehicles e Use the specific test s below to determine if the valves are functioning properly e Install air system components in areas protected from direct splash and road spray and install splash guards where necessary e Have2. present on the relay valve in cases where the cover is missing replace the entire valve with a new valve During installation confirm that the exhaust cover is firmly attached If the cover is present verify that the R 14 relay valve used is functioning properly by fully charging the air system and block and hold vehicle by means other than the air brakes Then make several brake applications and check for prompt application and release of each wheel s brakes with no perceptible lag lf the brakes are slow to release replace the relay valve and repeat the above test If the brakes continue to exhibit slow release refer to the troubleshooting section in your vehicle manufacturer s service manual Bulletin No TCH 013 017 Effective Date 7 30 08 Cancels N A Page 2 of 2 Subject Protect Your Bendix ATR 1 ATR 2 and R 14 Relay Valves from De icing Chemicals WARNING Please READ and follow these instructions to avoid personal injury or death When working on or around a vehicle the following general precautions should be observed at all times 1 Park the vehicle on a level surface apply the parking brakes and always block the wheels Always wear safety glasses Stop the engine and remove ignition key when working under or around the vehicle When working in the engine compartment the engine should be shut off and the ignition key should be removed Where circumstances require that the engine be in ope
3. ed Printed in U S A
4. more frequent inspection and maintenance schedules in regions that have greater exposure to de icing chemicals Early indications that maintenance is required include reports of brake drag that service brakes appear to be slow to release following a braking or traction control event When conducting the following Tests follow all industry standard safety guidelines including but not limited to those shown on page two of this Bulletin In all cases consult your vehicle manufacturer s service manual for details of any further tests that they recommend To Test ATR 1 and ATR 2 Traction Relay Valves The antilock traction control ATC system is tested by connecting the vehicle to a PC with the Bendix R 14 Relay Valve Cover for Balance Quick Exhaust Port Used for Anti Compound Functions Relay Valve Exhaust Port Secondary Exhaust Ports With Cover are Relay Valve Exhaust Port FIGURE 1 EXAMPLES OF R 14 RELAY VALVE AND ATR 1 AND ATR 2 TRACTION RELAY VALVES ACom diagnostics program loaded ACom software is available as a free download from www bendix com Run the ATC Valve Test provided in ACom diagnostics and verify that the brakes are fully releasing after the ATC event If the brakes are slow to release replace the traction relay valve and repeat the above check To Test R 14 Relay Valves Visually inspect where possible that the balance exhaust port cover is
5. ration EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving rotating leaking heated or electrically charged componenis Do not attempt to install remove disassemble or assemble a component until you have read and thoroughly understand the recommended procedures Use only the proper tools and observe all precautions pertaining to use of those tools If the work is being performed on the vehicle s air brake system or any auxiliary pressurized air systems make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle If the vehicle is equipped with an AD IS air dryer system or a dryer reservoir module be sure to drain the purge reservoir Reference Service Data Sheets ATR 1 Antilock Traction Relay Valve ATR 2 Antilock Traction Relay Valve R 14 Relay Valve Following the vehicle manufacturer s recommended procedures deactivate the electrical system in a manner that safely removes all electrical power from the vehicle Never exceed manufacturer s recommended pressures Never connect or disconnect a hose or line containing pressure it may whip Never remove a component or plug unless you are certain all system pressure has been depleted Use only genuine Bendix replacement parts components and kits Replacement hardware tubing hose fittings etc must be of equivalent size type and strength as original equipmen
6. t and be designed specifically for such applications and systems Components with stripped threads or damaged parts should be replaced rather than repaired Do not attempt repairs requiring machining or welding unless specifically stated and approved by the vehicle and component manufacturer Prior to returning the vehicle to service make certain all components and systems are restored to their proper operating condition For vehicles with Antilock Traction Control ATC the ATC function must be disabled ATC indicator lamp should be ON prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving ana ehen SD 13 4811 BW1794 oe SD 13 4812 BW1791 ee meek SD 03 1064 BW1431 ACom Diagnostics PC Software 2 00004 BW2329 Free downloads available on www bendix com ABS Repair and Diagnostics DVD BW2538 Visit the Literature Center on www bendix com for free downloads of Service Data Sheets or to order copies For more information contact your local Bendix representative or the Bendix Technical Assistance Team at 1 800 AIR BRAKE 1 800 247 2725 Monday through Friday 8 00 A M to 6 00 P M EST and follow the instructions in the recorded message Or you may e mail the Bendix technical assistance team at techteam bendix com Bendix 2008 Bendix Commercial Vehicle Systems LLC 7 08 All Rights Reserv
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