Collection: In Stock (10959)

The governor valve, which is usually compressor mounted, operates in conjunction with the compressor and maintains reservoir air pressure between a predetermined maximum and minimum pressure. The unloader valve allows the air compressor to operate in an unloaded state, where the compressor piston continues to reciprocate, but does not build additional air pressure in the vehicles compressed air system.

The trailer control valve in the towing vehicle causes the brake system of a trailer to be supplied with compressed air. It also controls the trailer brake system via the service brake system of the towing vehicle and via the parking and auxiliary brake valve.

Hand brake valves are used to activate & release the parking brake. In the control position, the pneumatic brake in the trailer can be released so that the effectiveness of the spring brake in the towing vehicle can be checked. Variants with an emergency release device prevent automatic braking of the spring brake in the event of a defective parking brake circuit.

Hand brake valves are used to activate & release the parking brake. In the control position, the pneumatic brake in the trailer can be released so that the effectiveness of the spring brake in the towing vehicle can be checked. Variants with an emergency release device prevent automatic braking of the spring brake in the event of a defective parking brake circuit.

On some trucks & trailers, the distance from the brake chambers to the foot valve is too far to cause immediate application of the brake when the foot valve is depressed. This is called brake lag. To correct this situation, a relay valve is installed near the rear brake chambers. A large diameter pipe is connected between the service reservoir and relay valve. The air line from the foot valve to the relay valve now becomes a control line that signals to the relay valve the amount of air to be drawn from the service reservoir for faster application of the brakes.

The clutch servo is a pneumatically-assisted clutch-actuation device, an essential component of the clutch system on heavy goods vehicles. Having the function to "amplify" the clutch pedal force by using air from the vehicle's compressed air system during the clutch disengagement process. The clutch servo is controlled hydraulically by the clutch master cylinder and operates the clutch mechanically via a lever system.

The compressor builds up & maintains air pressure required to operate air brakes & are either gear driven directly from the engine or belt driven. Most compressors use the truck’s lubrication & cooling systems, some are self-lubricated & some are air cooled. All compressors run continuously while the engine is running, but air compression is controlled and limited by a governor which loads or unloads the compressor. In the loaded stage, air is pumped into reservoirs. In the unloaded stage (with two cylinder compressors), the compressor pumps air back and forth between the two cylinders without supplying the reservoirs.

Foot control valves are foot-operated & applies air to operate the brakes on all wheels. The amount of air delivered to the brakes is regulated by the driver according to the distance the treadle or brake pedal is depressed. Releasing it exhausts air in the service brakes through its exhaust port. These valves are made in overhead styles with a foot pedal hanging down, or a floor-mounted version with a foot treadle.

The multi-circuit safety valve is responsible for the distribution of the compressed air into the brake circuits independent of each other. In the case of a failure, one or more circuits protect the functional circuits against drops in pressure.

The compressor builds up & maintains air pressure required to operate air brakes & are either gear driven directly from the engine or belt driven. Most compressors use the truck’s lubrication & cooling systems, some are self-lubricated & some are air cooled. All compressors run continuously while the engine is running, but air compression is controlled and limited by a governor which loads or unloads the compressor. In the loaded stage, air is pumped into reservoirs. In the unloaded stage (with two cylinder compressors), the compressor pumps air back and forth between the two cylinders without supplying the reservoirs.

The trailer control valve in the towing vehicle causes the brake system of a trailer to be supplied with compressed air. It also controls the trailer brake system via the service brake system of the towing vehicle and via the parking and auxiliary brake valve.

The trailer control valve in the towing vehicle causes the brake system of a trailer to be supplied with compressed air. It also controls the trailer brake system via the service brake system of the towing vehicle and via the parking and auxiliary brake valve.

The brake Caliper plays a central role in a disc-brake system and has two functions. First, it acts either as a bracket to support the brake pads on either side of the brake disc. The second, it uses pistons to convert pressure exerted when the foot brake is applied and clamps the brake pads against the brake disc to slow the wheels speed and bring the vehicle to a stop.

The function of a quick-release valve is to rapidly exhaust air from the controlled device. It is normally located adjacent to the controlled device, rather than requiring exhaust air to return and exhaust through the control valve. This decreases release time. A check valve is a device that only allows the flow of air in one direction and are commonly referred to as non return valves or one way valves.

The function of a quick-release valve is to rapidly exhaust air from the controlled device. It is normally located adjacent to the controlled device, rather than requiring exhaust air to return and exhaust through the control valve. This decreases release time. A check valve is a device that only allows the flow of air in one direction and are commonly referred to as non return valves or one way valves.

The function of a quick-release valve is to rapidly exhaust air from the controlled device. It is normally located adjacent to the controlled device, rather than requiring exhaust air to return and exhaust through the control valve. This decreases release time. A check valve is a device that only allows the flow of air in one direction and are commonly referred to as non return valves or one way valves.