Exam 52: Disc Brakes

What is the difference between front disc brakes and rear disc brakes?

What prevents moisture from entering the cylinder bore?

What component in the brake caliper acts as a retracting mechanism for the piston when hydraulic pressure is released?

Technician A readjusts the wheel bearings before measuring lateral runout. Technician B resurfaces or replaces rotors that have more than 0.003 inch of lateral runout. Who is correct?

____________________ brakes cause poor fuel economy and generate destructive amounts of heat that can cause serious brake damage and brake failure.

Sliding calipers move on bolts or pins.

What is lateral runout?

A typical floating caliper housing is designed with one caliper piston.

Technician A says a fixed rotor has an integral hub inside which the wheel bearings are mounted. Technician B says a floating rotor is less expensive than a fixed rotor and can be replaced easily and economically. Who is correct?

Electrical sensors on some vehicles advise the driver when the brake pads have worn thin and need to be replaced.

Identify four disc brake rotor problems.

Technician A says that worn pad linings can cause rotor wear. Technician B says that hard spots in a rotor usually result from a manufacturing defect. Who is correct?

Why is it important to install unidirectional rotors on the correct side of the vehicle?

Technician A says floating calipers must be removed from the steering knuckle when replacing brake pads. Technician B says fixed calipers must be removed from the steering knuckle when replacing pads. Who is correct?

Rotor thickness is measured at about ____________________ inch in from the outer edge of the rotor.

Large vehicles typically use ______ rotors.

____________________ rotors are made of two different materials, usually cast iron and steel, to reduce weight.

Which of the following statements concerning the caliper assembly is NOT correct?

After new pads are installed, Technician A breaks in the new pads by making a half dozen or more hard stops from high speed to check whether the brakes will fade when hot. Technician B breaks in the new pads with several gentle to moderate stops, allowing time for the pads and rotors to cool between stops. Who is correct?

When replacing rear pads on actuating-type calipers, the piston must be kept from spinning as the C-clamp pushes the piston back into the caliper bore.