21.

Answer A is wrong. The residual check valve is used on vehicles with drum brakes.

Answer B is correct. The constant low pressure, usually 6 psi to 8 psi keeps air from entering the wheel cylinders.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

Return    Learn more about master cylinder residual check valves.

22.

Answer A is wrong. High pressure gas charged accumulators are used with integral ABS systems. Low pressure spring loaded accumulators are sometimes used on non-integral ABS systems.

Answer B is correct. They typically use electric pumps to build pressure.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

Return    Learn more about ABS accumulators.

23.

Answer A is wrong. The signal is sent to the electronic controller for traction control.

Answer B is wrong. The signal is sent to the electronic controller for (ABS) anti-lock brake, (TCS) traction control system, and (ESC) electronic stability control.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

Return    Learn more about different (WSS) wheel speed sensors.

24.

Answer A is wrong. Excessive lateral rotor runout will result in a pulsating feeling in the brake pedal (front) or the drivers seat (rear).

Answer B is wrong. A warded brake drum is similar to a warped rotor and will result in a pulsating feeling in the brake pedal (front) or the drivers seat (rear).

Answer C is wrong. A worn CV- Joint will produce a clacking noise while cornering.

Answer D is correct. A worn out wheel bearing will cause a growl that increases with vehicle speed.

Return    Learn more about wheel bearing noise and diagnosis.

25.

Answer A is wrong. In most systems this is a normal response to road conditions and there is nothing for the customer to be concerned about. It indicates that the system is activated and restoring traction to the slippery road surface.

Answer B is correct. They use an electric pump and accumulator to apply the wheel brake on the wheel that has lost its traction.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

Return    Learn more about TCS traction control systems.