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Video Brakes
Video Single-circuit System
Video Dual-circuit Brake
Video Disc Brake
Video Turning Brake-discs
Video Disc parking brake
Video Drum Brake 1
Video Drum Brake 2
Video Drum Brake 3
Video Engine Brake
Video Master Cylinder 1
Video Master Cylinder 2
Video Brake Pad
Video Brake Pad 2
Video Brake Pad 3
Video Brake Fluid 1
Video Brake Fluid 2
Video Brake Servo
Video Brake assist system
Video Electr. Brake Servo
Video ABS 1
Video ABS 2
Video ABS 3
Video ABS 4
Video ABS/ESP-Hydr. Unit
Video ESP 2
Video Wheel sensor 1
Video Wheel sensor 2
Video Parking Brake
Video Overrun Brake 1
Video Overrun Brake 2
Video Brake recuperation 1
Video Brake recuperation 2
Video Brake recuperation 3
Video Elektro-hydr. Brake 1
Video Elektro-hydr. Brake 2
Video Calliper (electr. brake)
Video Brake Test Stand 1
Video Brake Test Stand 2
Video Floating Brake
Video Sliding-calliper 1
Video Sliding-calliper 2
Video Sliding-calliper 3
Video Sliding-calliper 4
Video Brake doesn't release
Video Disc-brake Caliper
Video Disc brake failure 1
Video Disc brake failure 2
Video Fixed-calliper 1
Video Fixed-calliper 2B
Video Fixed-calliper 3
Video Parking Brake 1
Video Parking Brake 2
Video Parking Brake 3
Video Parking Brake 4
Video Carbon Brake Disc
Video Ventilated Disc 1
Video Ventilated Disc 2

Video Compressed Air Brake 1
Video Compressed Air Brake 2
Video Electr. Compr. Air Brake
Video Driving Preparation
Video Drum Brake (truck) 1
Video Drum Brake (truck) 2
Video Drum Brake (truck) 3
Video Drum Brake (truck) 4
Video Disc Brake (truck) 1
Video Disk Brake (truck) 2
Video Trailer Brake System
Video Handbrake
Video Brake-air Compressor
Video Water-drainage
Video Air Dryer
Video Pressure Regulator
Video Four-circuit Protection
Video Dual-circuit Brake
Video ALB Regulator
Video Diaphragm Cylinder 1
Video Spring-type Cylinder 1
Video Spring-type Cylinder 2

Video Force (brake)
Video Distance (brake)
Video Time (brake)
Video Brake (pedal-force)

Video Brake (general) 1
Video Brake (general) 2
Video Hydraulic brake 1
Video Pneum. Brake 1
Video Pneum. Brake 2

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Compressed Air Brake System


Before the introduction of the electrically operated braking system in the motor car there was some concern that one would lose the direct controlling influence. As far as trucks, with their compressed-air brakes are concerned, this has been the case for quite some time now. The air-pressure developed by engine power can produce very high pressure through piston- or membrane cylinders. After decades a safety standard has been achieved, whereby trucks no longer have a significantly higher brake damage than do motor cars.
Why then, is the compressed-air brake only found in mid-range- to heavy trucks? The reason is, that up to twenty times more mass has to be braked than is the case with a motor car. This cannot be achieved by increasing the force on the brake pedal. The solution is that the total operating force must be produced by the braking system, whereby, the compressed-air to the wheel-brakes is very sensitively regulated by the pedal-force from the driver. However, such an expensive and space consuming system is only possible in the truck- and bus area.


The air pressure is generated, regulated and stored by the compressor (see figure), the air dryer, the pressure regulator and the reservoir. The four-circuit protection valve is responsible for the safety in the event of a pressure drop. In contrast to the hydraulic brake, the pressure force is produced solely through compressed-air. The brake-pedal force from the driver presses against a spring in the brake-valve and can be sensitively applied through an additional control system. The transmission of the pedal-force to the friction surface occurs through a membrane- or a piston cylinder.
For the hand-brake, strong springs are found in the rear brake cylinders. They can only be released after a certain amount of pressure has been reached. Thus, is driving without sufficient air-pressure not possible. On the subject of the air-brakes, the following terms are important:
Single-circuit braking system:
All the brake-cylinders are supplied through one air pressure system.
Dual-circuit braking system:
The brake cylinders of the front axle are supplied by a different air pressure system than the cylinders of the rear axle. In the event of a breakdown of one system, the other remains intact.
Single-conduit braking system:
In the case of the single conduit brake, the trailer is supplied and controlled, through a single conduit from the tractor unit. The more the pressure falls, the stronger the braking in the trailer brake valve is. During braking, no air-pressure supply to the trailer is possible.
Dual-conduit braking system:
In the dual-conduit braking system, the trailer is supplied from the tractor-unit through a red (reservoir) conduit and controlled through a yellow (brake) conduit. Also, fresh compressed-air flows to the trailer during a braking operation.


Pneumatic brake-systems are installed in mid-range-, heavy utility vehicles and in busses.               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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