ASE T4 Domain 3: Air and Hydraulic Antilock Brake Systems

A truck equipped with an ABS system shows intermittent wheel lock-up during braking. This is most likely due to:

In an ABS system, what is the primary function of the modulator?

When diagnosing an ABS fault, the technician finds that the ABS light remains on after engine start. This indicates:

During an ABS diagnosis, a technician finds a fault code indicating a problem with the "isolation valve." This valve primarily functions to:

In an ABS-equipped vehicle, a rapid pulsation in the brake pedal during heavy braking is a sign of:

A fault code in an ABS system indicating an "open circuit" most likely pertains to:

When testing an ABS system, a technician notes that the ABS activates during normal braking conditions. This could be caused by:

A heavy-duty truck with an ABS system displays uneven brake wear. The first component to inspect would be:

What symptom indicates a potential failure in the ABS hydraulic control unit?

In a vehicle with a properly functioning ABS, heavy braking on a slippery surface will result in: