California CDL Combination Practice Test 4

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Even before antilock braking systems (ABS) were required, some vehicles already had them. How can you check if your vehicle has ABS?

Look under the vehicle for the ECU and wheel speed sensor wires coming from the back of the brakes. Look under the vehicle for the ABS test light. Brake the vehicle on a slippery road and see if the wheels lock.

Correct Answer:

Look under the vehicle for the ECU and wheel speed sensor wires coming from the back of the brakes.

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