Technical information

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Technician Guidelines for Antilock Braking Systems

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V. GLOSSARY OF ABS TERMS

The following terms are used by one or more manufacturers to

describe different aspects of ABSs:

Antilock Braking System (ABS) A system that monitors and controls wheel speed during brak-

ing so as to minimize wheel lockup while maximizing vehicle

lateral stability. Plural form—ABSs.

ABS Configuration The arrangement of antilock braking system components,

which varies by the number of sensors and modulator valves

used. The following configurations for tractors are common-

place: 4S/4M, 6S/4M, and 6S/6M. For trailers, 2S/1M.,

2S/2M, 4S/2M and 4S/3M. (S=sensor. M=modulator.)

ABS Inline Valve A modulator valve located in the service brake delivery line

near the wheel’s brake chamber which modifies brake pressure

during an ABS event. Also see ABS Modulator Valve or ABS

Relay Valve.

ABS Modulator Valve An electro-pneumatic control valve that contains the solenoids

used to precisely modulate brake air pressure during an ABS

event. Also see ABS Inline Valve or ABS Relay Valve.

ABS Relay Valve A valve that performs the service relay function as well as the

ABS modulator valve function to modify brake air pressure

during an ABS event. Also see ABS Modulator Valve or ABS

Inline Valve.

Anti-Spin Regulation (ASR) See Traction Control.

Automatic Traction Control (ATC) See Traction Control.

Axle Control That mode of ABS control whereby one modulator controls the

air pressure to the brake chambers on both ends of a given

axle. Also referred to as axle-by-axle control.

Bracket Mounting The means of installing the ABS modulator-controller on the

host vehicle by using a supplied, pre-formed bracket.