NTTA questions - Braking

Sample braking questions

For maximum leverage a mechanical brake compensator should be set so that when the brake is fully applied the compensator is?
A = Extremely over center
B = Centered
C = Extremely under center
D = Causing minimum linkage movement

Vehicle braking effectiveness is directly related to?
A = The brake pads or lining shape
B = The brake pipes diameter
C = The systems being single or dual circuit
D = The brake pads or lining coefficient of friction

Excessive brake bind is most likely caused by
A = Air in a hydraulic system
B = Partially seized wheel cylinder pistons
C = A loose master cylinder
D = Fitting a non-standard extra large servo

A load sensing valve is for?
A = Providing a over-load warning to drivers
B = Controlling suspension movement to reduce brake cable wear
C = Measuring brake force on overloaded
D = Controlling maximum brake effort
The load sensing valve regulates the braking pressure passing to the brakes so that maximum pressure is only available when the vehicle is fully laden. As the vehicle's load is reduced the valve automatically lowers the braking pressure.

The amount of braking assistance provided by a servo is mainly determined by?
A = Servo diaphragm area
B = Servo diaphragm shape
C = Vehicle speed
D = The speed at which the brake is applied

Which on of the following brake efficiency ranges would a properly maintained car is expected to achieve in an emergency braking situation on a dry tarmac road?
a = 100% to 105%
b = 80% to 85%
c = 50% to 55%
d = 25% to 30%

Which one of the following is true about hydraulic brake fluid?
A = It is always a red color
B = It repels water
C = It freezes at approximately 0 degrees C
D = It absorbs water

A car is accidentally fitted with O/S/F wheel cylinders that have pistons 2.0mm GREATER in DIAMETER than the N/S/F wheel cylinders pistons. This is likely to cause?
A = excessive brake bind at the O/S
B = the brakes to pull to the O/S
C = the brakes to pull to the N/S
D = no difference in the braking

Hydraulic brake fluid?
A = compresses very easily
B = expands considerably when heated
C = is virtually incompressible
D = contracts considerably when cooled


Which one of the following is NOT a type of disc brake caliper?
A = sliding
B = swinging
C = expanding
D = twin piston

Which one of the following is true?
A = brake linings are always riveted to brake shoes
B = brake linings are always bonded to brake shoes
C = brake linings can absorb oil
D = brake linings cannot absorb oil
until now the brake linings were not only contaminated to a relatively small degree, but the fluid had massively soaked through the relatively soft brake lining material. This means undoubtedly that small amounts of oil leaking on the brake lining do not create any great problem during normal brake operation. Only if greater amounts of oil continuously leak onto the brake lining will the oil gradually soak through and finally cause a sudden brake failure

Excessive brake disc 'run-out' indicates that a brake disc is?
A = buckled
B = not circular
C = too small
D = worn thin

Which one of the following does NOT change the braking effectiveness of a car?
A = wheel cylinder piston length
B = wheel cylinder piston diameter
C = brake pedal pressure
D = brake linings or disc pads hardness


The wall thickness of steel hydraulic brakes pipes most commonly fitted on cars is approximately?
A = 3.0 mm (0.120 ins)
B = 2.5 mm (0.100 ins)
C = 1.8 mm (0.072 ins)
D = 0.7 mm (0.030 ins)
“Standard sizes of brake pipe include outer diameter size of 4.75 and 8 mm and/or a wall thickness size of 0.7 mm.” - www.freepatentsonline.com/20050031894.html

In a dual circuit hydraulic braking system one half of the system is for providing?
A = A parking brake
B = A secondary brake
C = Servo assisted braking
D = Optional ABS
“A split circuit braking system is now required by law in most countries for safety reasons; if one circuit fails, the other circuit can stop the vehicle”

An ABS system is for?
A = Preventing brakes from locking above a certain speed
B = Preventing brakes from overheating
C = Increasing brake servo action
D = Warning drivers of slipper road conditions

The terms “leading” or “trailing” in relation to brakes means?
A = A brake shoe applied with or against the rotation of a brake drum
B = Front or rear mounted disc brake calipers
C = Rear wheel inbound or outbound brakes
D = The arrangement of disc or drum brakes on a vehicle

Flexible brakes pipes are fitted because they?
A = Bend with suspension and or steering movement
B = Stretch with suspension and or steering movement
C = Do not conduct heat to brake fluid
D = Resist chaffing

Hydraulic Brake fluid has?
A = A higher boiling point than water
B = A lower boiling point than water
C = A boiling point similar to water
D = Not got a boiling point


A hydraulic brake system foot brake pedal feels hard if?
A = A wheel cylinder leaks
B = The wheel cylinders are seized
C = The brake system has the wrong fluid type
D = The brake fluid in the system is old

What half of a “split” hydraulic service braking system applies the parking brake?
A = Front half
B = Neither half
C = Rear half
D = Both front and rear halves
“A front/rear split system uses one master cylinder section to pressurize the front slave cylinders, and the other section to pressurize the rear slave cylinders. A split circuit braking system is now required by law in most countries for safety reasons; if one circuit fails, the other circuit can stop the vehicle”

The force capable of being applied by a foot brake vacuum servo is depending upon?
A = Master cylinder stroke length
B = Brake pedal travel
C = Atmospheric pressure
D = Engine temperature

A radius brake tester CANNOT be used for?
A = braking imbalance
B = parking brake performance
C = g valve action
D = full air braking system braking effort

A vehicle that can achieve 100% percent braking efficiency can?
A = stop immediately
B = stop in 100 meters
C = stop in 100 yards
D = Decelerate at a rate equal to gravity (g) i.e. approximately 9 : 1

A vehicle with hard pads on the N/S/F and soft pads on the O/S/F is likely to?
A = have excessive brake bind at the N/S/F
B = have excessive brake bind at the O/S/F
C = Pull to the N/S
D = Pull to the O/S

Excessive constant brake bind can be caused by?
A = excessively soft pads or linings
B = brake disc run-out
C = incorrectly adjusted brakes
D = Glazed brake pads or linings

An acceptable method of repairing a ruptured hydraulic metal brake pipe is?
A = Welding
B = Soldering
C = Brazing
D = None of the above

A vehicle with dual circuit brakes?
A = can stop twice as fast as a vehicle with single brakes
B = does not need a parking brake
C = always has disc brakes
D = has more than one brake fluid reservoir

Brake fade means that?
A = the hydraulic brake fluid level is too low in the reservoir
B = the brakes are loosing there effectiveness usually during sustained use
C = the brakes are too thick
D = the brake linings are too hard

Which one of the following is the ultimate factor that determines how quickly a vehicle can stop?
A = tyre pressure
B = tyre width
C = tyre type
D = tyre to road adhesion

A hand brake compensator is for?
A = equalizing brake effort
B = reducing hand brake travel
C = reducing brake rod or brake cable wear
D = releasing brakes quickly


A Braking system that is described as "air over hydraulic" is?
A = A hydraulic system that has air in it
B = A hydraulic braking system that is applied by air pressure
C = A hydraulic braking system with its reservoir open to the air
D = A "split circuit" braking system that is half hydraulic and air
And Alternative to hydraulic servo on light trucks and minibuses is compressed-air servo. The system is generally referred to as an air/hydraulic (air-over hydraulic) or Airpac system. Because compressed air is used to boost the force applied by the driver to a hydraulically operated brake.

What is most likely to cure a "spongy" brake pedal -?
A = Replacing the foot brake pedal rubber
B = Bleeding the brakes
C = Replacing worn brake shoes
D = Adjusting the brakes

Normal hydraulic brake fluid is?
A = High detergent mineral oil
B = Low Viscosity mineral oil
C = High viscosity mineral oil
D = None of the above

How would you check that a brake servo was working?
A = Listen for a change in engine speed when applying the foot brake
B = Measure the brake application time lag
C = Feel for an increase in brake pedal movement as the servo vacuum builds up after being emptied
D = Look for a change in the brake fluid reservoir level when the foot brake is applied