A5 Brakes (ASE Style Questions #6)

Which of the following should be used to measure the thickness of a scored rotor?

• Vernier caliper

• Outside micrometer with flat anvil and spindle

• Inside micrometer

• Outside micrometer with pointed anvil and spindle

During routine vehicle maintenance, the fluid level in the master cylinder reservoir is checked. When the reservoir cap is removed, purple colored fluid is found in the reservoir. Technician A says that this means the fluid should be topped off with DOT 4, which has a higher boiling point than regular brake fluid. Technician B says that this means that the fluid is contaminated; all rubber parts in the system must be replaced and the system flushed. Who is right?

• Technician A only

• Technician B only

• Both A and B

• Neither A nor B

A complete front brake service has just been performed on a vehicle with disc brakes: rotors turned, calipers rebuilt, new brake pads, bearings repacked and adjusted. However, when the vehicle is road tested, a pulsation can be felt through the pedal. Which of the following is the MOST LIKELY cause of the pulsation?

• Non-directional finish not applied to rotors

• Wrong lining compound chosen

• Over-torqued lug nuts

• Incorrect bleeding sequence

Brake fluid leaking from a cracked brake line causes the brake light on the dashboard to come on in response to the loss of hydraulic pressure. Which of the following valves in the hydraulic system switched on the light?

• Metering valve

• Pressure differential valve

• Proportioning valve

• Residual check valve

Technician A says a vehicle equipped with ECBA operates under higher pressure than a conventional hydraulic system. Technician B says an ECBA system may go into a self-check and pressurize the wheel calipers during service if a door is opened. Who is correct?

• Technician A only

• Technician B only

• Both A and B

• Neither A nor B

The diameter of drums mounted on the same axle should measure within how many thousandths of an inch of one another?

• 0.001

• 0.005

• 0.010

• 0.020

Absorption of 3% moisture can reduce the boiling point of DOT 3 brake fluid by what percentage?

• 10 percent

• 20 percent

• 25 percent

• 50 percent

All of the following are procedures for removing air from a hydraulic system EXCEPT:

• Bench bleeding

• Power bleeding

• Manual bleeding

• Vacuum bleeding

All of the following can be used to apply a non-directional finish to a disc brake rotor EXCEPT:

• Sanding block

• Fine file

• Lathe attachment

• Sanding disc

All of the following can cause a problem in the Hydro-Boost system EXCEPT:

• Loose power steering pump belt

• Leaking power steering hoses

• Low power steering pump pressure

• Leaking check valve