BENDIX M-21-M-22 ANTILOCK MOD ASSY Guia de Instalação descarregar pdf (Página 10)

MBS-2 Installation

ABS

Key Dates

March 1, 1997 Tractors must be equipped to provide full time power to

trailers.

March 1, 1998 Newly manufactured trailers must be equipped with ABS.

Some special use cases are exempt. (Refer to FMVSS-121

for specific details.)

April 1, 2000 ABS required on newly manufactured Canadian Vehicles

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-121, an approved ABS must automatically control the degree

of rotational wheel slip during braking by:

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.

Type of ABS Required for Trailers

ABS control is required on trailers as follows:

• 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.

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).

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BENDIX M-21-M-22 ANTILOCK MOD ASSY Guia de Instalação Página 10