Deck 97: Brake Bleeding Methods and Procedures

Question 1

The button on the ________ valve should be held when pressure bleeding the brakes.

A)Residual check
B)Metering
C)Proportioning
D)Pressure-differential

Answer 1

Metering

Question 2

The brake bleeding procedure usually specified for a rear-wheel drive vehicle with a dual split master cylinder is ________.

A)LR, RR, LF, RF
B)RF, LR, LF, RR
C)RR, LR, RF, LF
D)LF, RF, LR, RR

Answer 2

RR, LR, RF, LF

Question 3

Two technicians are discussing bench bleeding a master cylinder. Technician A says that the front (nose end) of the master cylinder should be bled first. Technician B says that rear (brake pedal end) should be bled first. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 3

Technician B only

Question 4

Two technicians are discussing how to loosen bleeder valves. Technician A says that a shock is usually necessary to break the taper at the base of the valve. Technician B says to apply steady, loosening torque to the bleeder valve using a 6-point wrench. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 5

Technician A says that the brake pedal should be depressed with as much force as possible during the normal bleeding procedure. Technician B says that the brake pedal should be pumped rapidly during this manual bleeding procedure to force the air down toward the bleeder valve(s). Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 6

Vacuum is applied where during vacuum bleeding?

A)At each wheel brake bleeder valve
B)At the master cylinder reservoir
C)At the metering valve end of the combination valve
D)At the vacuum booster check valve

Question 7

The bleeder is opened at a caliper and no brake fluid flows out. Technician A says that this is normal and that brake fluid should not flow or drip out of an open bleeder valve. Technician B says that the vent port in the master cylinder may be blocked. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 8

The usual maximum pressure that should be used when pressure bleeding a brake system is ________.

A)70 psi
B)50 psi
C)30 psi
D)20 psi

Question 9

How does a bleeder valve seal?

A)O-ring
B)Lip seal
C)By the threads
D)Tapered end

Question 10

Air in the brake hydraulic system can cause all EXCEPT ________.

A)May require the driver to "pump up" the brakes before they will stop the vehicle
B)Lower than normal brake pedal
C)Spongy brake pedal
D)Hard brake pedal

Question 11

Two technicians are discussing bleeding air from the brake hydraulic system. Technician A says to depress the brake pedal slowly and not to the floor to prevent possible seal damage inside the master cylinder. Technician B says to wait 15 seconds between strokes of the brake pedal. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 12

Technician A says that the bleeder valves must be located at the highest part of the caliper or wheel cylinder. Technician B says that the bleeder valves have a hole in the center. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 13

Why shouldn't a service technician depress a brake pedal all the way down when bleeding brakes?

A)It builds too much pressure
B)The brake pedal could bind
C)The sealing cups can be damaged
D)The sealing cups would uncover the compensating port

Question 14

While bleeding brakes, how long should you wait between strokes?

A)30 seconds
B)10 seconds
C)5 seconds
D)15 seconds

Question 15

Which of these is NOT a method of brake bleeding?

A)Vacuum
B)Pressure
C)Release
D)Manual

Question 16

Manual brake bleeding ________.

A)Is most commonly used
B)Requires two people
C)Is the least expensive method
D)All of the above

Question 17

When manually bleeding the wheel brakes, press the brake pedal rapidly to the floor.

Question 18

When bleeding wheel brakes, the bleeder screw is usually loosened one-half turn.

Question 19

Bleeding is complete when a stream of fluid free of air bubbles flows from the bleeder screw.

Question 20

Pressure bleeders are charged to approximately 300 psi (2069 kPa).

Question 21

Discharge the power brake booster before manually bleeding the brakes.

Question 22

In an overall bleeding sequence, which part should be bled first?

A)Combination valve
B)Master cylinder
C)Brake calipers
D)Wheel cylinders

Question 23

Technician A says that the wheel brake farthest from the master cylinder is generally bled first. Technician B says that the wheel brake closest to the master cylinder is generally bled first. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 24

Vacuum bleeding requires ________.

A)Metering valve override
B)A pump handle to be squeezed to create a partial vacuum in a catch bottle.
C)Both A and B
D)Neither A nor B

Question 25

Pressure bleeding requires ________.

A)A special adapter to fit the wheel cylinders
B)A special adapter to fit the master cylinder
C)Only two technicians
D)No special tools or adapters

Question 26

Technician A says that a bleeder screw wrench is needed to manually bleed brakes. Technician B says that a length of plastic hose and clear jar should be used when manually bleeding brakes. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 27

Technician A says to bleed the conventional brake system before bleeding the ABS modulator. Technician B says a scan tool may be required to bleed the ABS modulator. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 28

Why do many vehicle manufacturers recommend that brake fluid be changed regularly?

A)The boiling point of the brake fluid decreases
B)Brake fluid absorbs moisture over time
C)Old brake fluid can cause rust and corrosion of brake system components
D)All of the above