Antilock Brakes / Traction Control Systems: Description and Operation

Anti-lock Brake System (ABS) And Anti-Lock Brake System With Electronic Differential Lock (ABS/EDL) ITT Mark 20 IE
General





ABS layout (left-hand drive vehicle)
The ABS or ABS/EDL brake system is divided diagonally. Brake pedal pressure is boosted pneumatically by a vacuum brake booster.
Vehicles with ITT Mark 20 IE ABS do not have a mechanical brake pressure regulator. The control module controls the rear axle brake pressure regulation.
Malfunctions of the ABS or ABS/EDL systems do not influence conventional braking or the vacuum brake booster. The conventional braking system remains functional if the ABS is not operating.





The hydraulic part -a- and control module part -b- form one unit. They can only be separated when removed from the vehicle.
New control modules (replacement parts) are not coded and must be coded after installation.
Before working on the ABS or ABS/EDL, determine the cause of the malfunction using the On Board Diagnostic (OBD) program.

Differences between ABS ITT Mark 20 IE and ABS/EDL ITT Mark 20 IE





I-ABS - ITT Mark 20 IE
Dimension a = 100 mm (3.9 inch)

II-ALBS/EDL - ITT Mark 20 IE
Dimension a = 130 mm (5.1 inch)