Answers
Tech A says that parking brakes on drum brake vehicles use separate brake shoes for backup in an
emergency. Tech B says that parking brakes on drum brake vehicles mechanically operate the standard
drum brake shoes. Who iscorrect? - ANSWER:Tech B
Which of these drum brake systems uses servo action in both directions? - ANSWER:Duo-servo drum
brake systems
Tech A says that brake shoe linings saturated with brake fluid from a leaky wheel cylinder can be cleaned
with brake cleaner and reused as long as they aren't worn out. Tech B says that brake shoes should be
replaced in axle sets. Who is correct? - ANSWER:Tech B
Tech A says that a metal-on-metal grinding noise in drum brakes generally requires replacing the brake
shoes and resurfacing or replacing the drums. Tech B says that one way to help identify whether a
problem is coming from the front or rear brakes is to test-drive the vehicle in a safe place at a relatively
low speed and lightly apply the parking brake. Who is correct? - ANSWER:both A and B
Tech A says that most brake drums are designed to be machined if minor surface issues are present. Tech
B says that brake drums can be reused if they are machined larger than specifications, as long as the
surface is smooth. Who is correct? - ANSWER:Tech A
All of the following statements with respect to a wheel cylinder and piston are true EXCEPT: - ANSWER:It
is standard practice to hone out deep pits in the wheel cylinder bore.
The component of the drum brake system attached to the backing plate is the: - ANSWER:wheel cylinder
Tech A says to use an air hose to clean the backing plate of dust and contamination. Tech B says to use a
water-based cleaning solution to clean the backing plate of dust and contamination. Who is correct? -
ANSWER:Tech B
Among the tools used to diagnose and repair drum brake systems, the wheel cylinder piston clamp is
used to: - ANSWER:hold the pistons in the wheel cylinder while the brake shoes are removed.
Choose the correct statement: - ANSWER:The backing plate has holes stamped in it.
Tech A says that duo-servo brake shoes are only anchored on the top. Tech B says that duo-servo brakes
typically use single-piston wheel cylinders. Who is correct? - ANSWER:Tech A
Tech A says that both secondary shoes should be installed on the passenger side of the vehicle. Tech B
says that the lining on the primary shoe is typically shorter in length than the lining on the secondary
shoe. Who is correct? - ANSWER:Tech B
When the driver releases the brake pedal, the brake shoes are withdrawn by the: - ANSWER:return
spring
, Which of the following brake tools is used to adjust brake shoes when the drum is installed? -
ANSWER:brake spoon
Tech A says that when performing a brake job on the rear axle of an older vehicle, inspection finds brake
fluid under the dust boot; the wheel cylinder should be replaced. Tech B says that when a drum brake
return spring has failed, springs on both rear wheels need to be replaced. Who is correct? -
ANSWER:both A and B
Tech A says that riveted lining is usually for heavy-duty or high-performance vehicles. Tech B says that
bonded lining is glued to the metal brake shoe. Who is correct? - ANSWER:Both A and B
Choose the correct statement: - ANSWER:Riveted linings are used on heavier duty or high-performance
vehicles.
All of the following statements with respect to brake systems are true EXCEPT: - ANSWER:trailing shoes
are self-energizing.
Tech A says that a cleaned-up self-adjuster can be installed on either side of the vehicle. Tech B says that
grease seals are meant to be reusable. Who is correct? - ANSWER:Neither A nor B
The component that prevents a direct path for water spray and dirt to enter the brake drum is the: -
ANSWER:Labyrinth seal.
Tech A says that an antilock brake system (ABS) allows the front wheels to be steered during a panic stop.
Tech B says that ABS sensors apply or release hydraulic pressure to the wheel brake units during ABS
brake events. Who is correct? - ANSWER:Tech A
If we triple the speed of an object, the kinetic energy will: - ANSWER:increase by nine times.
All of the below statements are true EXCEPT: - ANSWER:Service brakes consist of drum and/or disc
brakes and are operated by hand.
Tech A says that tire pressure does not affect braking. Tech B says that heavy vehicle loads increase
stopping distance. Who is correct? - ANSWER:Tech B
Tech A says that the heavier the vehicle, the more stopping power is needed. Tech B says that the faster
a vehicle is moving, the more braking power is needed. Who is correct? - ANSWER:Both A and B
Tech A says that water soaked brake shoes can be a cause of brake fade. Tech B says that disc brakes
dissipate heat faster than drum brakes. Who is correct? - ANSWER:Both A and B
Tech A says that kinetic energy is created during braking to stop the vehicle. Tech B says that kinetic
energy is converted to heat energy during braking. Who is correct? - ANSWER:Tech B
Tech A says that the brake pedal uses leverage to multiply foot pressure. Tech B says that when braking
hard while moving forward, the vehicle's weight transfers to the rear wheels, increasing their traction.
Who is correct? - ANSWER:Tech A
Which of these is a simple mechanical system that uses leverage to force a friction block against one or
more wheels? - ANSWER:Scrub brake