Exam 50: Brake Systems

An aluminum master cylinder ______.

Synthetic linings are made of _____

Factors that determine a vehicle's braking power are being discussed. Technician A says the coefficient of friction between the pad and rotor or shoe and drum is a factor. Technician B says heat dissipation from brake components is a factor. Who is correct?

Technician A says when the Brake warning light is illuminated, there is a difference in pressure between the two brake hydraulic circuits. Technician B says the Brake warning light is illuminated when the fluid level in the master cylinder reservoir is low. Who is correct?

Bleeding a hydraulic system involves removing ____________________ from the system.

Since _____, all cars have been required to have two separate brake systems.

____________________ is the distance between the brake pedal and the floor after the pedal has been depressed fully.

Brake fluid must be able to flow freely at 500°Fahrenheit (260° Celsius)and at -104°Fahrenheit (-76° Celsius).

A metering valve is found only on cars and trucks with ______.

All brake fluids are hygroscopic-that is, they readily absorb water.

Vehicles use brake pedal position sensors.

Brake lines are made of ______.

What type of power-assist unit uses pressure developed by an external pump, such as a power steering pump?

The owner of a vehicle complains the car is hard to stop. The technician doing the diagnosis starts by pumping the brake pedal several times with the engine off, and then starts the engine while holding firm pressure on the brake pedal. The pedal falls away slightly and less pressure is needed to maintain the pedal in any position. What does this test prove?

Master cylinders are generally not overhauled; they are replaced with new or rebuilt master cylinders.

Explain why modern hydraulic braking systems are dual designs.

What color is clean brake fluid?

Technician A says low-drag calipers retract the pistons and pads farther from the rotor than traditional calipers. Technician B says systems that use low-drag calipers cannot use quick take-up master cylinders. Who is correct?

Technician A says power brakes are designed with vacuum-assisted units that use engine vacuum. Technician B says power brakes are designed with vacuum-assisted units that use vacuum developed by an external pump. Who is correct?

The residual pressure check valve is used in the hydraulic circuit for ____________________  brakes.