Chapter 7 Flashcards
List the basic parts of a disc brake.
rotor, brake pads, caliper, hub
Explain the advantages and disadvantages of an aluminum caliper.
less weight, but more expensive
Why do manufacturers use two-piece rotors on some vehicles?
less expensive/lighter, floating rotor
In addition to keeping road splash off the brake assembly, why are splash shields used on disc brakes?
help maintain vehicles braking performance
Why is asbestos no longer used for brake pad and shoe linings?
health hazards
What are common classifications of brake pad and shoe friction materials?
organic, semi-metallic, ceramic
What is the difference between fixed and sliding calipers?
Fixed caliper is bolted to the support and doesn’t move the brakes when applied
How does a low-drag caliper operate?
separates the brake pard from the rotor so its doesn’t rub
Explain how a floating caliper applies the brake pads.
the brakes are applied evenly to all areas to ensure equal brakes performance
Explain the purpose of a drum-in-hat rotor.
bypasses the hydraulic braking system to stop the car in an emergency
Front calipers are mounted on ____ _____ or adapters that may be an integral part of the steering knuckles.
caliper supports
When any brake installation reaches its limit of heat dissipation, ______ _______ sets in.
brake fade
________ rotors are made of different materials, usually cast iron and steel, to reduce weight.
composite
_______ linings usually wear faster than do semi-metallic linings, but they have the benefit of breaking in faster.
organic
With disc brakes most of the ________ area is cooling while only a small area directly contacts the friction materials at any given time.
swept
Disc brakes do not suffer from _______ fade because the rotor does not expand away from the pads.
mechanical
Low-drag calipers require a quick take-up _______ cylinder.
master
The _____ converts hydraulic pressure from the master cylinder to mechanical force.
caliper
Many rear disc brakes have a small brake drum built into the center of the_______.
rotor
Sliding or floating calipers have a piston only on the ______ side.
inboard
The advantages and disadvantages of disc brake systems are being discussed.
Technician A says that disc brakes are more likely to develop brake fade and water fade.
Technician B says that reduction of mechanical fade and gas fade is an advantage of disc brakes.
b
The operation of disc brake systems is being discussed.
Technician A says that composite rotors were developed to save weight.
Technician B says that a fixed rotor assembly is part of the hub.
Who is correct?
c
Disc brake calipers are being discussed.
Technician A says that a single caliper may have one, two, or more pistons.
Technician B says that the piston seal is known as a square-cut seal.
Who is correct?
c
Technician A says that solid rotors can usually be machined several times before their minimum thickness limits are reached.
Technician B says that composite rotors have cast-iron hubs with steel friction surfaces.
Who is correct?
d
When discussing disc brake work,
Technician A says that organic linings are a composite material made from bonding nonmetallic fibers.
Technician B says that semi-metallic linings require higher brake pedal effort but are more fade resistant compared to organic linings.
Who is correct?
Two technicians are discussing a disc brake caliper:
Technician A says that calipers use springs to retract the seals after a brake application.
Technician B says that sliding calipers typically use one piston on each side of the rotor.
Who is correct?
d
Technician A says that a return spring is used to retract a caliper piston.
Technician B says that the piston seal retracts the caliper piston when hydraulic pressure is released.
Who is correct?
b
Technician A says that inner and outer pad friction materials may have different coefficients of friction.
Technician B says to follow the manufacturer’s recommendation for inboard and outboard pad linings when replacing brake pads.
Who is correct?
a
Technician A says that when the driver hears the audible brake pad wear indicator, he or she should immediately park the car and not use it until the brakes are replaced.
Technician B says that the wear pad indicators alert the driver to worn pads that should be replaced soon.
Who is correct?
b
