Exam 99: Drum Brakes

Technician A says that drum brakes can fail to slow the vehicle if driven through deep water. Technician B says that when drum brakes get hot, the brake pedal will drop because the drum expands away from the shoes. Which technician is correct?

The dual-servo brake is more powerful than any non-servo design.

Brake shoe holddowns are used to reduce brake noise.

Cup expanders are used in some wheel cylinders to ________.

Two technicians are discussing brake lining edge codes. Technician A says that the code can identify the manufacturer. Technician B says that all friction material from the same manufacturer will have the same edge codes. Which technician is correct?

Which lining does most of the braking on a leading/trailing brake?

Trailing shoes generally wear at a faster rate than leading shoes.

Brake drum rotation de-energizes the trailing shoe.

Two technicians are discussing drum brake self-adjusters. Technician A says that some brakes self-adjust when the brakes are released when the vehicle is driven in reverse. Technician B says that some brakes self-adjust when the brakes are applied rather than when released. Which technician is correct?

The shoe support pads ________.

On the dual-servo braking system, which shoe does most of the braking during forward movement of the vehicle?

________ action uses the stopping power of one shoe to help increase the application force of the other shoe.

Identify the parking brake strut in this illustration.

A typical drum brake uses how many hold-down springs?

A typical drum brake backing-plate has how many shoe support pads (also called ledges)?

In a servo brake, the secondary shoe provides approximately what percentage of the total stopping power?

The brakes on a dual-servo drum system are designated as ________.