BENDIX TCH-008-021 System Leakage, Reservoir Draining System without an Air Dryer, Air Dryers

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Bulletin No.: TCH-008-021

Effective Date: 3/5/2010

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System Leakage

Check the air brake system for excessive air leakage using the Bendix “Dual System Air Brake Test and Check List” (BW1279). Excessive system leakage causes the compressor to “pump” more air and also reduce the life of the air dryer desiccant cartridge.

Reservoir Draining (System without an Air Dryer)

Routine reservoir draining is the most basic step in reducing the possibility of freeze-up. All reservoirs in a brake system can accumulate water and other contamination and must be drained! The best practice is to drain all reservoirs daily if the air brake system does not include an air dryer. When draining reservoirs; turn the ENGINE OFF and drain ALL AIR from the reservoir, better still, open the drain cocks on all reservoirs and leave them open over night to assure all contamination is drained (reference Service Data Sheet SD-04-400 for Bendix Reservoirs). If automatic drain valves are installed, check their operation before the weather turns cold (reference Service Data Sheet SD-03-2501 for Bendix® DV-2™Automatic Drain Valves). It should be noted that, while the need for daily reservoir draining is eliminated through the use of an automatic drain valve, periodic manual draining is still required.

Reservoir Draining (System with an Air Dryer)

Daily reservoir draining should not be performed on systems with an air dryer. This practice will cause the dryer to do excessive work (i.e. build pressure from 0 -130 psi instead of the normal 110-130 psi).

Alcohol Evaporator or Injector Systems

Bendix Commercial Vehicle Systems LLC discourages the use of alcohol in the air brake system as a means of preventing system freeze-up in cold temperatures. Studies indicate that using alcohol and alcohol based products sold for this purpose removes the lubrication from the components of the air braking system. In addition, the materials used for the internal seals of the air system components may be adversely impacted by the residue that some anti-freeze additives leave behind. Both are detrimental to air system component life expectancy, causing premature wear. Because of this, Bendix® air system components warranty will be void if analysis shows that alcohol was added to the air brake system.

Alcohol is not an acceptable substitute for having adequate air drying capacity. If the air dryer is maintained in accordance with the manufacturer’s recommended practices and moisture is found to be present in the system reservoirs, more drying capacity is required. Bendix has several viable options including extended purge air dryers, extended purge tandem dryers in parallel with common control, and air dryers arranged to provide continuous flow as with the Bendix® EverFlow® continuous flow air dryer module. To address concerns with contaminants in trailer air brake systems, the Bendix® Cyclone DuraDrain™ water separator and the Bendix® System-Guard®trailer air dryer are available. Refer to Bendix Technical Bulletin TCH-008-042 “Alcohol in the Air Brake System” for additional information.

Air Dryers

Make certain air brake system leakage is within the limits stated in BW1279. Check the operation and function of the air dryer using the appropriate Service Data Sheet for the air dryer.

Air Dryer

Service Data Sheet

 

 

 

 

AD-2®air dryer

SD-08-2403

Bendix literature is

AD-4®air dryer

SD-08-2407

AD-9®air dryer

SD-08-2412

available to order or

AD-IP®air dryer

SD-08-2414

download on Bendix.com

AD-IS®air dryer

SD-08-2418

 

AD-IS®EverFlow® air dryer

SD-08-2417

 

AD-SP®air dryer

SD-08-2415

 

Cyclone DuraDrain™ water separator

SD-08-2402

 

PuraGuard® QC system filter

SD-08-187B

 

Trailer System-Guard®air dryer

SD-08-2416

 

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Contents Discharge Lines Dryer Inlet TemperatureEngine Idling Compressor Line SizeReservoir Draining System without an Air Dryer Air Dryer Service Data SheetSystem Leakage Reservoir Draining System with an Air Dryer

TCH-008-021 specifications

The BENDIX TCH-008-021 is a prominent component in the realm of heavy-duty braking systems, specifically designed for commercial vehicles and trailers. This advanced trailer control valve plays a critical role in managing the braking aspect in vehicles equipped with air brake systems, ensuring safety, reliability, and optimal performance during various driving conditions.

One of the main features of the BENDIX TCH-008-021 is its dual-function design that incorporates both a spring brake control and a trailer brake control feature. This dual functionality allows for effective engagement of the trailer's braking system, making it an essential component for fleet operators and truck drivers who frequently handle heavy loads. The control valve is designed to offer enhanced responsiveness, which translates into improved braking performance, especially during sudden stops or emergency situations.

The technology behind the BENDIX TCH-008-021 is rooted in precision engineering. The valve is constructed from high-quality materials to withstand the rigors of harsh operating environments. It features a robust housing that is resistant to corrosion, ensuring a long operational life. Additionally, the valve utilizes advanced sealing technologies to prevent leaks and maintain optimal pressure within the braking system, thereby enhancing overall safety.

Another characteristic worth noting is the ease of installation and maintenance of the BENDIX TCH-008-021. This feature simplifies the process for technicians performing repairs or routine inspections, leading to reduced downtime and improved vehicle availability. The valve is compatible with a range of braking systems, making it a versatile choice for various vehicle models and configurations.

In conclusion, the BENDIX TCH-008-021 is a reliable and efficient trailer control valve that embodies the cutting-edge technologies and engineering standards synonymous with the BENDIX brand. With its dual-functionality, high-quality construction, and ease of maintenance, it stands out as a preferred choice for professionals seeking to enhance the safety and efficiency of their braking systems in heavy-duty applications. The commitment to excellence in design and performance makes the BENDIX TCH-008-021 a key component for those who demand the best in their commercial vehicles.
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