Drum Brake Systems Flashcards
What are the names given to the brake shoes in a dual-servo brake system?
a) primary
b) secondary
A brake shoe that wraps into the drum as it is applied si said to be a/an:
a) energized shoe
b) non-energized shoe
c) trailing shoe
d) bonded shoe
a) energized shoe
Which of the following components is usually mounted directly to the backing plate?
a) self-adjuster operating lever
b) drum
c) parking brake strut
d) anchor
d) anchor
The heel of a brake shoe is loacted:
a) where the lining is the thinnest
b) at the opposite end from the applying force
c) at the same end as the applying force
d) where the shoe contacts the anchor
b) at the oppostire end from the applying force
The term brake fade describes which of the following conditions?
a) a brake pedal that sinks slowly to the floor
b) brakes that lose their stopping power when wet
c) a build-up of heat that reduced friction between the drum and linings
d) a gradual reduction in braking efficiency as the linings wear.
c) a build-up of heat reduced friction between the drum and linings
Servo-action in brakes occurs when the _________ show applies the _________ shoe
primary, secondary
Four types of drum construction are:
a) dual-servo, two-leading shoe, leading-trailing and uni-servo
b) cast aluminum, bi-metal, composite and stamped steel
c) composite, spun-cast composite, bi-metal and cast iron
d) fixed, hubless, floating and hubbed
c) composite, spun-cast composite, bi-metal and cast iron
When checking the mounting pads on a backing plate, what range should they be in?
a) 0.20 mm (0.008 in)
b) 1.0 mm (0.040 in)
c) 0.10 mm (0.004 in)
d) 0.50 mm (0.020 in)
d) 0.50 mm (0.020 in)
When servicing a brake system, the brake dust:
a) is not hazardous on vehicles built after 1995
b) may be cleaned with a blow gun if a breathing mask is worn
c) is potentially bio-hazardous and must be handled accordingly
d) should only be cleaned is a HEP vacuum system is available
c) is potentially bio-hazardous and must be handled accordingly
Semi-metallic linings:
a) are less prone to brake fade than organinc linings
b) can be replaced with organic linings for quieter braking
c) are made with synthetic materials such as Kevlar and aramid fibres
d) are always riveted to the shoe
a) are less prone to brake fade than organic linings
Secondary linings are longer and thicker becasue:
a) they are softer and will wear faster
b) they are the only ones to apply when the vehicle is backing up
c) the drum concentrates more heat at the rear
d) servo-action applies them with more force than the primary
d) servo-action applies them with more force than the primary
After replacing brake linings or brake drums what should you do?
a) take the vehicle for a short test drive around the block
b) take a test drive that includes burnishing the brakes
c) test drive the vehicle on rough gravel roads or alleys
d) take the vehicle on hills during your test drive
b) take a test drive that includes burnishing the brakes
The parking brake is applied by:
a) a mechanical system, usually a cable
b) a hydraulic wheel cylinder
c) servo-action
d) self-energization
a) a mechanical system, usually a cable
The parking brake strut:
a) applies force to the anchor
b) applies force to the shoe opposite from the operating lever
c) operated the self-adjuster lever on a dual-servo brake
d) contains the self-adjuster on most dual-servo brake systems
b) applies force to the shoe opposite from the operating lever
Adjustment of the parking brake should be done only:
a) if the brakes have been relined
b) when the brakes are warm
c) after checking the adjustment of the service brake
d) if the brake pedal is getting low
c) after checking the adjustment of the service brake
