Brakes, Handling Controls and Safety Systems

The ABS light remains on after its brief self-test during startup. What does it mean?

• There is a fault stored, but ABS will intervene during certain traction events

• The conventional braking system will have reduced functionality

• There is a fault stored, and ABS will not intervene during traction events

• The conventional braking system becomes fully disabled

A customer states that the ASR/ESC lamp flashed briefly last week on a curvy road, but there are no faults stored. What is the most likely cause?

• The ABS module is faulty because it didn't store faults

• The ESC module is faulty because it didn't store faults

• There was a traction event and the system operated normally

• There are worn brake pads that require replacement.

A customer states that when using the electro-mechanical parking brake, the light in the switch turns off after about 30 seconds when the ignition is switched off. What is the most likely cause?

• It's normal operation

• It's on terminal 30, so there has to be a short to terminal 31 on the ground side

• It's on terminal 30, so there has to be a short between terminal 75x and power

• It's on terminal 50, so this is normal

What happens when the electro-mechanical parking brake switch is operated above 7km/h?

• The electro-mechanical parking brake gradually applies to operate as an emergency brake

• Nothing. The electro-mechanical parking brake switch is deactivated above 7km/h

• The electro-mechanical parking brake applies abruptly to operate as an emergency brake

• ESC will intervene and apply hydraulic braking force until the vehicle speed decreases to 7km/h.

When AUTO HOLD first activates, the vehicle is held in place by the hydraulic brake system.

• True

• False

What happens when AUTO HOLD is active for more than 3 minutes?

• The system switches from the hydraulic brakes to the electro-mechanical brakes

• The ABS module overheats from the continuous running of the hydraulic pump (V156)

• The wheel speed sensor trigger wheels are engaged with parking pawls

• It deactivates at the 3 minute mark, be prepared!

How does an Indirect Tire Pressure Monitoring system detect a low tire?

• It can't because the it uses only wheel rotation comparisons

• There is a back-up Direct TPMS sensor that is activated after approximately 40 revolutions are not seen by the Indirect system

• Using the 3rd law of PFM

• Software in the ABS Control Module detects changes in wheel speed via the wheel speed sensors.

Which statement is true regarding Dynamic Chassis Control (DCC)?

• It uses only a complex magnetic system to make adjustments

• Dampening profiles cannot change until the vehicle is stationary

• A valve located on each strut / shock regulates fluid / gas flow between an inner and outer chamber.

• It uses an electronic worm-gear type piston

An inductive wheel speed sensor will produce which of the following waveforms?

• 
• 
• 
• 

Technician A states that a binding caliper piston can cause the vehicle to pull during braking.

Technician B states that when the brakes are applied, the vehicle will pull towards the wheel with the binding / seized caliper.

Who is correct?

• Technician A

• Technician B

• Both Technicians

• Neither Technician