Brakes 5

A solid brake disc has two frictional surfaces, if excessive braking applied they suffer

• Overheating

• Fade

• Warping

• All of the answers

Ventilated discs are better than solid discs because:

• They are cheaper to produce

• They are lighter than solid discs as they are aluminium

• They have an air space to cool brakes

• They can turn in both directions

co-efficient of friction is described as:

• Friction reduces as temperature increases

• Friction increases as temperature increases

• Friction must remain constant

• Temperature must remain constant

How many pistons are there in a sliding caliper?

• Four

• Two each side

• One

• More pistons on high performance calipers

Why are drilled brake discs used on cars?

• They decrease the friction coefficient between pad & disc

• They allow more air into solid disc

• They increase the friction coefficient between pad & disc

• They remove water from brakes

As kinetic energy is converted into heat by the surfaces of the brakes causing friction. this can cause brake fluid to boil this is known as:

• Efficiency

• Imbalance

• Fade

• Lag

What is the material used in brake pads?

• Very strong rubber blocks

• Asbestos Compound

• Compound inc. Fibres of Wood, Steel, Ceramic, Carbon and Glass

• Compound Rayon, Nylon and Plastic

When the leading shoe is dragged onto the drum this is known as:

• Trailing shoe

• Slip shoe

• Self-servo action

• Brake servo action

Handbrake linkage operates:

• one wheel at a time

• equally on both wheels on same axle

• 70/30 split between front and rear wheels

• 50/50 between front wheels

Leading and trailing shoe arrangement is important on drum brakes, why is this?

• It allows self-servo action in both directions.

• The shoes know their place.

• Otherwise handbrake could not work.

• Because servo does not work on rear brakes.