Hydraulic Brakes Foundations

Resistance to motion between two objects is called

braking

friction

gravity

kinetic

Correct! Wrong!

If all the brakes on a vehicle seem to drag, yet all foundation adjustments seem right, a possible cause would be:

incorrectly adjusted push rod to master cylinder

water in brake fluid

failure to install a residual check valve

plugged replenishing port

Correct! Wrong!

When a person releases the brakes on a vehicle (takes their foot off the pedal) the fluid in the brake lines returns to the master cylinder reservoir through the:

replenishing port

compensation port

primary cup check valve

action of the over center spring for the brake pedal

Correct! Wrong!

What is responsible for causing the pads to move away slightly from the rotors on a disc brake system?

return springs

returning fluid velocity

rotor parallelism

caliper piston seal

Show hint

Correct! Wrong!

Which item would be faulty if brake fluid were to leak out of the firewall side of the master cylinder?

primary cup on the secondary piston

primary cup on the primary piston

secondary cup on the secondary piston

secondary cup on the primary piston

Correct! Wrong!

If a rotor had faulty parallelism what driveability problem may be incurred?

steering pulsation

dragging brakes

squealling brakes

wheel lock up

Correct! Wrong!

What should be used to clean internal hydraulic brake parts?

brake clean solvent

carburetor cleaner

brake fluid and denatured alcohol

gasoline

Correct! Wrong!

With a floating caliper disc brake system, during brake application:

both the caliper and the piston(s) move

only the hydraulic piston(s) moves

only the brake caliper moves

the piston and caliper return to the original position

Correct! Wrong!

The purpose of the vent port in the master cylinder is to:

allow the pressure to build up gradually when brakes applied

allow the trapped fluid around to spools to return to the master cylinder reservoir when brakes are released

allow the fluid to enter into the cylinder area in fron of secondary cup

allow pressure in the system to increase as brakes are applied

Correct! Wrong!

Disc type brakes systems:

do not have residual check valve

have a residual pressure of 6 to 8 pounds

have one residual check valve

have two residual check valves

Correct! Wrong!

The purpose of the drum brake backing plate is to:

provide support for the brake drum

provide support for the axle housing

provide a support for the grease seal

provide a support for the wheel cylinder and brake shoes

Correct! Wrong!

Technician A says that dust boots on wheel cylinders and caliper pistons keep dirt and water from entering the cylinder. Technician B says that dust boots keep brake fluid from leaking from the cylinder or calipers and contamining the brake linings. Who is correct?

Technician A

Technician B

Both A and B

Neither A nor B

Correct! Wrong!

Cup expanders are used in some wheel cylinders to:

allow for wear on the cups and the cylinder walls

to protect the cups from wear from the pressure of the spreader spring

help spread the lips of the cups toward the cylinder walls

allow for the expansion of the brake fluid as its temperature increases

Correct! Wrong!

The temporary loss of braking efficiency caused by overheating is called:

sliding friction

wet friction

brake fade

coefficient loss

q14

Show hint

Correct! Wrong!

Master cylinders have an expanding diaphragm seal under the cover of the reservoir. This seal is used to:

prevent fluid evaporation, aeration or contamination

maintain pressure in the system

extends upwards to take up space left by fluid displacement due to brake pad wear

extends upwards to prevent a vacuum forming above the fluid which would prevent proper function of the master cylinder

q15

Show hint

Correct! Wrong!

Brake fluid that is bled from a brake system should be:

saved and re-used

discarded

filtered and re-used

re-used after left standing for 24 hours

q16

Show hint

Correct! Wrong!

Hydraulically actuated disc brake + caliper systems require:

frequent manual adjustment

no manual adjustment

no visual inspection

periodic lubrication

q17

Show hint

Correct! Wrong!

What type of lubricant should be used when assembling wheel cylinders or master cylinders?

lubriplate

10W motor oil

brake fluid

vaseline

Correct! Wrong!

q18

Loose asbestos dust should be removed from the foundation brake mechanism by:

compressed air

water solution spray

a small blush

all of the above

Correct! Wrong!

If a petroleum product such as oil is allowed to contaminate brake fluid in a hydraulic brake system, what would be permanently damaged?

system''s plastic parts

the aluminum cylinder pistons

the brake shoes

system''s rubber parts

Correct! Wrong!

If brake fluid containers are left open after use, what will contaminate the fluid?

absorbed air

absorbed moisture

absorbed oxygen

absorbed nitrogen

Correct! Wrong!

The process of bleeding of the hydraulic brakes systems refers to:

small amounts of fluid seen at wheel cylinders

removing excess fluid from the system

quickly pumping the brakes to test them

removing air from the system

Correct! Wrong!

When brake drums have been measured, and found at the maximum limit specified by vehicle manufacturer, the brake drum should be:

scrapped

re-used with special oversized lining

marked, re-installed and the vehicle owner should be informed

re-installed, because the limits are exaggerated in their importance

Correct! Wrong!

Brake linings that are contaminated and soaked with gear oil:

can be safely and adequately cleaned with brake cleaning solvents

can be safely and adequately cleaned with alcohol and blown dry

cannot be safely and adequately cleaned and should be discarded

cannot be cleaned except by heating the linings with a torch and burning the oil out

Correct! Wrong!

If brake fluid is splashed into a person''s eyes, the first thing to do is:

call a doctor for better information

immediately flood the eyes with water for a minimum of 10 minutes

bandage the eyes carefully with gauze

rub the eyes carefully with a tissue

Correct! Wrong!

When installing servo type brake shoes, the primary shoe should be placed on the backing plate:

to the rear of the vehicle

upwards on its anchors

down on its anchors

to the front of the vehicle

Correct! Wrong!

A vehicle with hydraulic brakes with a complaint that all four wheels seem to experience brake drag after their application. On the hoist, you find the shoe adjustment seems OK. A possible cause is:

a low level of fluid in the master cylinder

air in the hydraulic system and requires bleeding

no brake-pedal free travel

parking brake cables adjusted too tight

Correct! Wrong!

If a brake pedal rises and falls or pulsates and the steering wheel shifts slightly left and right when brakes are applied, one probable cause may be:

glazed linings

one or more caliper pistons seized

lack of brake-pedal free travel

a rotor with uneven parallelism

Correct! Wrong!

Consistant brake pedal pulsation in a drum brakes system may be caused by:

out of round drum

poor brake linings

a tire bulge

improperly inflated tires

Correct! Wrong!

Intermittant pedal pulsation may also be caused by:

wheel bearing lubrication leaking onto lining

loose or bad wheel bearings

leaking wheel cylinder

air in the system

Correct! Wrong!

air in the system

soft lining

compressing the fluid

air in the system

improper pedal clearance

Correct! Wrong!

Overheating a brake drum results in abnormal thermal expansion, which can cause:

grabbing brakes

tight, dragging brakes

brake fade

all of the above

Correct! Wrong!

A disc-brake rotor should be checked for run-out, which should not exceed limits specified in the appropriate service manual. Excessive rotor run-out will result in:

pulsating brake pedal during brake application

a vibrating steering wheel during brake application

increased brake pedal travel

all of the above

Correct! Wrong!

The normal procedure when turning drums is to start at the

outside with a coarse cut

outside with a fine cut

inside with a coarse cut

inside with a fine cut

Correct! Wrong!

The dash brake warning light in a brake system which uses a dual master cylinder, operates:

when a hard brake application is made for an emergency stop

together with the stop light switch when the brakes are applied normally

when either half of the dual system fails when the brakes are applied

when the brake lining reaches critical temperatures

Correct! Wrong!

The need for brake adjustment is generally indicated by:

the master cylinder fluid level

the stopping distance of the vehicle

the brake pedal travel

the firm of spongy brake pedal feel

Correct! Wrong!

Air trapped in the hydraulic system can be detected by:

severe brake operation

the level of the fluid in the master cylinder

a "bubbling" noise when brakes are applied

a "spongy" brake pedal

Correct! Wrong!

Serious damage, brake failure and leaks may result if the rubber seals of a hydraulic brake system owing to the presence of:

air

brake fluid

oil

water

Correct! Wrong!

A vehicle owner states that brake fluid is leaking from behind the brake pedal and dripping on the carpet. The most probable cause of this problem is a defective:

primary cup on the primary piston

secondary cup on the primary piston

primary cup on the secondary piston

secondary cup on the secondary piston

Correct! Wrong!

A customer complains that his disc brake equipped vehicle seems to pull or drift to the right after he applies and releases the brakes and tries to drive on. Which of the following might cause the problem?

seized floating caliper on the right side

seized floating caliper on the left side

a plugged vent port in the master cylinder

a plugged replenishing port in the master cylinder

Correct! Wrong!

The diameter on a driveline parking brake drum is greater at the center than at both edges of the friction surface. Which of these faults describes this description?

Bell-mouth drum

Concave brake drum

Drum out of round

Convex drum

Correct! Wrong!

A truck with hydraulic disc/drum brakes makes severe hard brake applications and experiences brake fade, but does not experience brake fade on repetitive light brake applications. Technician A says this could be caused by an improperly adjusted proportioning valve. Technician B says brake drums worn or machined beyond the maximum diameter could cause this condition. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

You are inspecting for certification, a truck equipped with hydraulic disc brakes. Technician A says you must remove the wheels, in most cases, to properly observe and measure pad thicknesses or damage. Technician B says if the brakes were applied shortly before measuring the lining or rotor thicknesses, the actual sizes will be larger than recorded on the worksheets. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

Cable-actuated parking brake systems are commonly found in:

diagonally split hydraulic brake systems

air operated brake systems

hydraulically operated systems

air-over hydraulic parking systems

q44

Show hint

Correct! Wrong!

Technician A says that it is friction built up in or on the drum/rotor that causes a vehicle''s forward motion to stop. Technician B says it is the friction of the tires to the road that actually stop a vehicle''s motion. Who is right?

A only

B only

Both A and B

Neither A nor B

q45

Show hint

Correct! Wrong!

A truck with a hydraulic braking system is being overhauled. Technician A uses a vacuum gauge to test master cylinder output. Technician B says that all the wheel cylinders must be inspected, reconditioned or replaced when an overhaul is being performed. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

Technician A says that a hydraulic disc brake caliper can have two pistons. Technician B says that a hydraulic disc brake caliper can have one, two or four pistons. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

Hydraulic single piston disc brake systems are said to have:

servo action

noncervo action

energizing action

action and reaction

Correct! Wrong!

Technician A says that on brakes with vented rotors, the inboard pad could be thicker than the outboard pad. Technician B says that on brakes with solid rotors, the inboard and outboard pads could be the same thickness. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

What is the difference between a fixed caliper and a sliding caliper?

Fixed calipers are less expensive than a sliding caliper

Sliding or floating calipers are less expensive than fixed calipers

Fixed caliper pads are smaller than sliding caliper pads

Unlike sliding calipers, a fixed caliper has pistons on both sides of a brake calipers.

Correct! Wrong!

Resistance to motion between two objects is called

If all the brakes on a vehicle seem to drag, yet all foundation adjustments seem right, a possible cause would be:

When a person releases the brakes on a vehicle (takes their foot off the pedal) the fluid in the brake lines returns to the master cylinder reservoir through the:

What is responsible for causing the pads to move away slightly from the rotors on a disc brake system?

Which item would be faulty if brake fluid were to leak out of the firewall side of the master cylinder?

If a rotor had faulty parallelism what driveability problem may be incurred?

What should be used to clean internal hydraulic brake parts?

With a floating caliper disc brake system, during brake application:

The purpose of the vent port in the master cylinder is to:

Disc type brakes systems:

The purpose of the drum brake backing plate is to:

Technician A says that dust boots on wheel cylinders and caliper pistons keep dirt and water from entering the cylinder. Technician B says that dust boots keep brake fluid from leaking from the cylinder or calipers and contamining the brake linings. Who is correct?

Cup expanders are used in some wheel cylinders to:

The temporary loss of braking efficiency caused by overheating is called:

Master cylinders have an expanding diaphragm seal under the cover of the reservoir. This seal is used to:

Brake fluid that is bled from a brake system should be:

Hydraulically actuated disc brake + caliper systems require:

What type of lubricant should be used when assembling wheel cylinders or master cylinders?

Loose asbestos dust should be removed from the foundation brake mechanism by:

If a petroleum product such as oil is allowed to contaminate brake fluid in a hydraulic brake system, what would be permanently damaged?

If brake fluid containers are left open after use, what will contaminate the fluid?

The process of bleeding of the hydraulic brakes systems refers to:

When brake drums have been measured, and found at the maximum limit specified by vehicle manufacturer, the brake drum should be:

Brake linings that are contaminated and soaked with gear oil:

If brake fluid is splashed into a person''s eyes, the first thing to do is:

When installing servo type brake shoes, the primary shoe should be placed on the backing plate:

A vehicle with hydraulic brakes with a complaint that all four wheels seem to experience brake drag after their application. On the hoist, you find the shoe adjustment seems OK. A possible cause is:

If a brake pedal rises and falls or pulsates and the steering wheel shifts slightly left and right when brakes are applied, one probable cause may be:

Consistant brake pedal pulsation in a drum brakes system may be caused by:

Intermittant pedal pulsation may also be caused by:

air in the system

Overheating a brake drum results in abnormal thermal expansion, which can cause:

A disc-brake rotor should be checked for run-out, which should not exceed limits specified in the appropriate service manual. Excessive rotor run-out will result in:

The normal procedure when turning drums is to start at the

The dash brake warning light in a brake system which uses a dual master cylinder, operates:

The need for brake adjustment is generally indicated by:

Air trapped in the hydraulic system can be detected by:

Serious damage, brake failure and leaks may result if the rubber seals of a hydraulic brake system owing to the presence of:

A vehicle owner states that brake fluid is leaking from behind the brake pedal and dripping on the carpet. The most probable cause of this problem is a defective:

A customer complains that his disc brake equipped vehicle seems to pull or drift to the right after he applies and releases the brakes and tries to drive on. Which of the following might cause the problem?

The diameter on a driveline parking brake drum is greater at the center than at both edges of the friction surface. Which of these faults describes this description?

Cable-actuated parking brake systems are commonly found in:

Technician A says that it is friction built up in or on the drum/rotor that causes a vehicle''s forward motion to stop. Technician B says it is the friction of the tires to the road that actually stop a vehicle''s motion. Who is right?

A truck with a hydraulic braking system is being overhauled. Technician A uses a vacuum gauge to test master cylinder output. Technician B says that all the wheel cylinders must be inspected, reconditioned or replaced when an overhaul is being performed. Who is right?

Technician A says that a hydraulic disc brake caliper can have two pistons. Technician B says that a hydraulic disc brake caliper can have one, two or four pistons. Who is right?

Hydraulic single piston disc brake systems are said to have:

Technician A says that on brakes with vented rotors, the inboard pad could be thicker than the outboard pad. Technician B says that on brakes with solid rotors, the inboard and outboard pads could be the same thickness. Who is right?

What is the difference between a fixed caliper and a sliding caliper?

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Heavy-Duty Mechanic - Trucks & Equipment