MAINTENANCE - What is the Air System? valve to allow air to flow into the brake chambers. Contamination of the air supply system is the major cause of problems in air-operated components such as brake valves, and suspension height control valves. To keep contaminants to the lowest possible level, follow these maintenance procedures. WARNING compliance to FMVSS 121 could cause loss of vehicle control and may lead to death or serious personal in- jury. Completely bypassing a Bendix® ADIS air dryer will bypass the system’s pressure protection valves. This could lead to loss of air pressure or damage to the vehicle’s air system, which could cause an accident involving death or personal injury.
Always adhere to the manufacturer’s procedure if it is nec- essary in an emergency to temporarily bypass an ADIS series air dryer. Fail- ure to comply may result in death, per- sonal injury, equipment or property damage. WARNING 3 If the supply and service air tanks are not drained at the recommended fre- quency, water could enter the air lines and valves. This could cause corrosion or blockage, which could compromise the brake system safety and potential- ly cause an accident. Failure to comply may result in death, personal injury, equipment or property damage. Daily Checks Drain moisture from the supply and service air tanks. Operate air devices to circulate lubricants within the unit.
Periodically Clean filter screens ahead of the valves by removing the screens and soaking them in solvent. Blow them dry with pressurized air before reinstalling them. WARNING Your vehicle’s compressor takes outside air and compresses it, usually to 100-120 psi (689-827 kPa). The compressed air then goes to the reservoirs to be stored until needed. When you operate your air brakes, the stored compressed air flows into the chambers where it is used to apply your truck and trailer brakes. That is why, when you push down on your brake pedal, you don’t feel the same amount of pressure on the pedal that you do when you apply the brakes on your car.
All you are doing on your truck is opening an air If a different air dryer brand or model is installed on the vehicle other than what was originally installed, it could cause the air system to not perform correctly unless the full air system de- sign is reviewed and modifications made to comply with Federal Motor Vehicle Safety Standards (FMVSS) 121 AirBrake Systems. Failure to abide by this warning and maintain Twice a Year Maintain the air compressor to prevent excessive oil by-pass. See your maintenance manual for details. Replace worn seals in valves and air motors as they are needed. Y53-1272-1B1 (08/17) 31