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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

Electronic Pneumatic-brakes

Electronic components
Control device1
Proportional-relay-valve front axle regulation3
Proportional-relay valve rear axle regulation4
Proportional-relay valve trailer regulation2


Should the pneumatic brake be fitted with an electronic control system, it's character is changed, but it still looks, at least from the outside, very much the same, because the operation is still carried out pneumatically. Thus, the air-pressure production,- the filtering. and -the drying are still preserved. The air reservoirs, brake circuit and with it, the four-circuit protection valve are still necessary. However, behind the two-circuit brake valve, it's a different story all together. In this case, the automatic load-dependent brake valve (ALB) is missing, and there are proportional valves (in 4 and 5) which, in any event, block the path between the brake valve and the wheel cylinders, also when the brake is electronically intact.


The best thing to do, is to use the explaination for the regulation of the wheel sensors, which earlier, were used only for the ABS-function. This way, the control device can determine the amount of delay or the slip of each wheel. the signal can be so finely broken down that, even when braking very lightly, any difference, eg., between the axles is registered. The control device now has the job to transfer the driver's wishes when braking, registered through the distance sensor on the brake valve to all the wheels and the trailer evenly. Through a proportional relay-valve, the respective pressure in the wheel cylinder is regulated and constantly checked to ensure that the braking values are correctly maintained. All specific features like eg., advanced response (approx. 1 bar) can now be called up from the identity fields in the control device. This brake not only regulates differently, it can also do more than the solely pneumatic regulated brake. Thus, it also maintains the once-initiated braking operation, even when travelling downhill. A stronger operation of the brake valve is not necessary. Longer periods of operation can also somewhat compensate for varying brake-pad wear. Through a button on the dashboard, it's even possible to activate a hill-holder to safely pull-off on an uphill.

Why is the pneumatic part of the brake valve still necessary? For one thing, the 'pedal feeling' must naturally, through counter pressure be present. Added to this, the safety aspect with trucks, is, of course, very important. In a situation where no electricity exists, the proportional valves (in 3 and 4) open, so that the brakes function once again pneumatically, however, only without taking disturbance variables like ,eg., the loading, into consideration.
Parts of the electrics/electronics have been simplified or left out so that the diagram does not appear overloaded. The warning lights and dials on the dashboard are not shown, neither are the sensors for the brake-pad wear indication. The Can-Bus is also not mentioned in the diagram. It is indispensable as a connection to the engine, the retarder and the gearbox. Almost more important still, is the communication between the tractor control device and the EBS-trailer brake-valve. The data connection and the remaining electrics have their own trailer interface.               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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