Brake System Knowledge Quiz

Rear brakes do less work during hard braking than the front brakes because ________.

• the rear brakes are larger

• the vehicle weight transfers forward

• the rear tires have less traction

• Both B and C are correct

Technician A says that disc brake rotor may have internal passages for cooling. Technician B says that the faster the vehicle is traveling when the brakes are applied, the greater the amount of heat created in the brake system. Which technician is correct?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

A 3000 pound vehicle is calculated to have a kinetic energy of 90,000 ft-lb at 28 mph. If the speed of the vehicle remains the same and the weight is doubled to 6000 pounds, what will happen to the calculated kinetic energy?

• It will remain the same.

• It will increase proportionally (× 2), to 180,000 ft-lb.

• It will increase by the square (× 4), to 360,000 ft-lb.

• None of these are correct.

What type of binder is used in all brake friction materials?

• Rubber scrap

• Carbon

• Phenolic resin

• Ceramic powders

Weight transfer during braking is caused by ________.

• inertia

• friction

• weight bias

• brake bias

The static friction coefficient is always higher than the kinetic friction coefficient.

• True

• False

The kinetic energy of a vehicle traveling at 60 mph is ________ when compared to the same vehicle traveling at 30 mph.

• twice as much

• three times higher

• four times as much

• ten times higher

Which Greek letter is used to represent the coefficient of friction?

• Mu (μ)

• Omega (Ω)

• Delta (∆)

• Pi (π)

Why is copper being reduced in brake friction materials?

• Because it is a health concern when it becomes airborne

• It can affect life in rivers and streams

• To help reduce the weight of the vehicle

• To help reduce the cost of the brake pads/linings

Weight has a greater effect on kinetic energy than speed.

• True

• False