Final Flashcards
True or false
A dust boot seal automatically adjust caliper piston position.
False
True or false
Rear disc parking brakes have a mechanism that forces against the rotor hydraulically.
False
True or false
When hydraulic pressure is diminished, The caliper piston seal functions of a return spring to retract the piston.
True
True or false
Atypical fixed caliper housing is designed with one caliper piston.
False
True or false
During pad replacement, some caliper pistons must be rotated with a special tool to retract all the way into the caliber bore.
True
True or false
Most manufacturers recommend that the caliper mounting pins and their bushings do you replace each time the caliper is removed.
True
True or false
All manufacturers recommend holding the caliber bore when overhauling the calipers.
False
True or false
In most calipers, the dust boot is installed in the caliper bore groove before the piston is installed.
True
What are rotors typically made from?
Cast iron
Caliper housings are made from what kind of metal?
Aluminum and cast iron
How can brake pad linings be attached to the shoe?
They can be riveted or bonded
Technician a says that worn pad linings can cause rotor wear. Technician b says that hard spot and a rotor usually result from a manufacturing defect. Who is correct?
A
Technician a replaces the pad if the linings are less than 1/8 inch. Technician B says if the pad on one side of the caliper is worn more than the other side, the rotor has excess run out and must be replaced. Who is correct?
A
Electronic pad wear warning systems are being discussed. Technician a says the pad wear sensors are wired in parallel. Technician B says the wear sensors are wired in series. Who is correct?
Both
A vibration or pulsation in the brake pedal when the brakes are applied is usually caused by _____?
Warped rotors [runout]
Technician a readjusts the wheel bearings before measuring lateral run out. Technician B resurfaces or replaces rotors that have more than 0.003 inches of lateral run out. Who is correct?
A
____________ brakes cause poor fuel economy and generate distractive amounts of heat that can cause serious brake damage and brake failure.
Dragging
_____________ rotors are made of two different materials, usually cast iron and steel, to reduce weight.
Composite
Improper tightening of the wheel lug nuts could cause the rotor to _________.
Warp or twist
Air in the disc brake hydraulic system will cause a ___________ pedal.
Spongy
Brake ________are metal plates with linings riveted or bonded to them.
Pads
Name for major advantages of disc brakes as compared to drum brakes.
Resistance to heat fade, resistance to water fade, automatically adjustable, increased straight-line stopping ability.
After a road test, what items should be checked before wheels are pulled?
Tires for excessive wear or improper inflation, wheels for bent or warped rims, wheel bearings for looseness or wear, suspension components to check whether they are worn or broken, brake fluid level, master cylinder.
Identify the two items that are always replace during caliper overhauls.
Piston seals and dust boots
What are the three major parts of a disc brake assembly?
Hub and rotor assembly, caliper assembly, brake pad assembly.
What is the difference between front disc brakes and rear disc brakes?
Rear need a parking brake
Front rotors are usually vented and rear rotors are solid
Rear brakes have smaller pads and less rotor surface area
True or false
Drum brakes are still used on front wheels of any late model car and like trucks.
False
True or false
Small lightweight cars often use duo-servo drum brake designed to reduce brake lock up.
False
True or false
Duo-servo drum brake systems use an adjusting screw assembly and spring to connect the lower end of the shoes.
True
True or false
A floating drum is mounted on a hub and wheel bearing assembly.
False
True or false
A self adjuster screw mechanism or star wheel, or non-directional and can be positioned on either the left or the right side of the vehicle.
False
True or false
The self adjusters, starwheels, for the left side and the right side or interchangeable.
False
In a typical drum brake system, which component provides a foundation for the brake shoes and associated hardware?
Backing plate
In the unapplied position, drum brake shoes are held against the anchor pin by what?
Return Springs
On most vehicles, the automatic adjuster system is installed on which shoe?
Primary or secondary
Secondary
Technician a says and out of round drum can cause a pulsating brake pedal. Technician B says and out of round drum can cause the brakes to grab. Who is correct?
Both
Servicing are you drum break with hard spots that are causing chatter and brake pull is being discussed. Technician a says grinding off a hard spot is a long-term a pair. Technician B says the drum must be replaced. Who is correct?
B
Rear wheel drum brake removal is being discussed. Technician a says that on some FWD vehicles, the rear bearings must be disassembled to remove the drum. Technician B says that on some FWD vehicles, the drums are held in place by wheel lugs. Who is correct?
Both
technician a says the leading shoe in a non-servo brake does most of the work when the brakes are applied while in reverse. Technician B says the trailing shoe does most of the work when the brakes are applied while moving forward. Who is correct?
Neither
Technician a says self adjustment occurs on most duo-servo brakes whenever the foot break is applied while backing up. Technician B says self adjustment occurs on a non-servo brake whenever the foot break is applied one driving forward. Who is correct?
Neither
Technician a says on a duo-servo brake the front shoe is called the primary shoe and the rear shoe is the secondary shoe. Technician B says on a non-servo brake, the front shoe is called the leading shoe and the rear shoe is the trailing shoe.
Both
Before removing the drum on a nondriven wheel, ______.
All the above
During a break inspection, the right rear brake shoes are soaked with a liquid. Technician a says the wheel axle seal is leaking. Technician B says the wheel cylinder is leaking. Who is correct?
Both
What tool is used to adjust the brake shoes before the drum is installed?
Shoe set gauge
The effort of the parking brake pedal assembly or handgrip is multiplied and passed into the rear cables by the _______________ lever.
Equalizer
On duo-servo drum brake systems, The forward brake shoe is often called the __________ shoe.
Primary
The lever that moves the star wheel on the self adjuster is called a(n) _________.
Adjuster lever or pawl
Another term for nonservo type of brakes is __________________.
Leading trailing
List five types of wear or distortion to look for when inspecting drum brakes.
Scored, bell mouthed, concave, convex, hard spots, heat checks, cracks, threaded, and out of round conditions.
Explain the operation of an integral drum brake parking brake.
As the parking brake cable is pulled, the levers and the parking brake struts move the shoes out word against the drum.
What three checks should be made before conducting a road test for a brake problem?
Check the brake fluid level, check for adequate pedal reserve, and perform a series of low speed stops to be sure the brakes are safe for road testing.
Identify five non-break component concerned that may affect braking performance.
Low tire pressure’s, worn tires, misalignment of the front end, faulty shock absorbers and suspension components, and loose wheel bearings may affect breaking performance.
List for components of a wheel cylinder.
Cylinder housing, dust boot, pistons, cup seals, cup expander spring, bleeder screw, two seat, mounting bolts or E clip.
What is the difference between return Springs and hold down Springs?
Hold down Springs hold the shoes to the backing plate.
Return Springs hold the two pads together
