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MBS-1P Installation
ABS
Key Dates
March 1, 1997 Tractors must be equipped to provide full time power
March 1, 1998 Newly manufactured trailers must be equipped with ABS.
April 1, 2000
March 1, 2001 Trailer malfunction lamp is required in the tractor cab.
March 1, 2008 Trailer mounted malfunction lamp no longer required.
ABS Design Requirements
Under FMVSS-1221, an approved ABS must automatically control the degree
of rotational wheel slip during braking by:
Type of ABS Required for Trailers
ABS control is required on trailers as follows:
Direct Control refers to an axle that is equipped with wheel speed sensors
and is controlled by a modulator valve or valves in response to the wheel
speed sensor signals. If this valve(s) also controls the brakes of another
axle(s) that does not have sensors, the axle(s) is referred to as an indirectly
controlled axle(s).
6
to trailers.
Some special use cases are exempt. (Refer to FMVSS-121
for specific details.)
ABS required on newly manufactured Canadian Vehicles.
1. Sensing the rate of angular rotation of the wheels.
2. Transmitting signals regarding the rate of wheel angular rotation to one or
more controlling devices which interpret those signals and generate
responsive controlling output signals.
3. Transmitting those controlling signals to one or more modulators which
adjust brake actuating forces in response to those signals.
• Full Trailers – Direct ABS Control is required on at least one front and
one rear axle.
• Semi Trailers and Dollies – Direct ABS Control is required on at least
one axle.
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