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If unsure if a trailer is equipped with ABS, you can:
A.  Check under the trailer for wheel speed sensors coming from the back of the brakes.
B.  Try driving on a slippery surface and see if ABS kicks in.
C.  Assume it does have ABS.
D.  Remove a tire and look for the ABS sensor on the axle.
Trailers and converter dollies built on or after March 1, 1998 are required to have Anti-Lock Braking Systems (ABS). This will be indicated by the presence of a yellow malfunction lamp. You can determine if older trailers have ABS by checking under the trailers for ECU and wheel speed sensor wires coming from the back of the brakes.
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