CHAPTER 14 DRUM BRAKE FUNDAMENTALS EXAM

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CHAPTER 14 DRUM BRAKE FUNDAMENTALS EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -26 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Lining attachment

Answer:

Can be riveted or bonded to the table

Question 2: Hold-down springs

Answer:

Hold the shoes against the backing plate but allow them to move easily

Question 3: Support pads

Answer:

Flat spots on the backing plate to support brake shoes

Question 4: The two parts of a brake shoe

Answer:

Table and web

Question 5: Star wheel adjuster

Answer:

Used to adjust clearance between brake shoe s and drum

Question 6: Maximum diameter (discard diameter)

Answer:

Usually stamped on the drum, and given in thousandths of an inch or millimeters

Question 7: Aluminum drum

Answer:

Consist of a cast iron liner surrounded by an aluminum housing

Question 8: Concentric ground linings

Answer:

Used on large trucks and medium- to heavy-duty vehicles, brake shoe contacts drum evenly

Question 9: Brake shoe self-energizing

Answer:

As the drum rotates, friction at the point where the lining contacts the drum will pull the lining into the drum; this wedges the lining with more force than was originally applied

Question 10: Floating anchor

Answer:

The end of the brake shoe web opposite the wheel cylinder attaches to the other brake shoe web through the star adjuster mechanism, allowing the entire shoe assembly to move

Question 11: Backing plate (support plate)

Answer:

The foundation for the drum brake components, it also acts as a splash shield against water and debris

Question 12: Non-servo brakes

Answer:

Used on small vehicles, often with front-wheel drive, because the rear brakes carry only a small portion of the braking load When the vehicle is moving forward, the front shoe is self-energizing, but the rear shoe is not

Question 13: Brake shoe leverage

Answer:

The actuating force that is applied to one end of a shoe produces leverage when the other end of the shoe is solidly anchored

Question 14: Fixed anchor

Answer:

The end of of the brake shoe web opposite the wheel cylinder meets an anchor pin or plate attached to the backing plate

Question 15: Automatic star wheel adjusting devices

Answer:

Cable adjusters Link adjusters Lever adjuster

Question 16: Internal expanding brakes

Answer:

Brake components are inside a drum, and the shoes must move outward to contact the drum

Question 17: Cast iron drum

Answer:

most common type of drum, durable and withstands heat very well

Question 18: Brake drums

Answer:

Provide a cast iron braking surface for the shoes to work against, absorb and dissipate large amounts of heat

Question 19: Contour ground linings

Answer:

Brake shoe lining thicker at the center

Question 20: Servo brakes

Answer:

The primary shoe transfers force to the secondary shoe through a floating star wheel adjuster, causing the secondary shoe to jam up and out

Question 21: Keystone anchors

Answer:

Allow the shoes to slide up or down on the anchor

Question 22: Leading or primary shoe

Answer:

Brake shoe that faces the front of the vehicle

Question 23: Return springs

Answer:

Coil springs connected between the shoes and a stationary support (anchor) or from one shoe to the other

Question 24: Anchor pin (plate)

Answer:

Solid attaching point for the brake shoes and springs

Question 25: Trailing or secondary

Answer:

Brake shoe that faces the rear of the vehicle, it performs more of the braking effort and is often larger

Question 26: Brake lining groove

Answer:

Relieves stress on shoe web, reducing uneven contact pressure, and dry out wet linings by channeling water out and circulating air