Ase A5 Flashcards

Front 1

The brake pedal is low and spongy; all brake adjustments have been completed according to specifications. The cause of the problem could be:

A)Binding pedal linkage.

B)Dented brake line.

C)Plugged compensating port.

D)A weak hydraulic hose.

Back 1

A) A weak hydraulic brake hose could cause a spongy pedal. As the pressure builds in the system, the hose may expand and not relay the pressure to the brake units.

Front 2

A vehicle has no brake pedal free play. This problem may cause:

Back 2

Without some free play, the brakes may not fully unapply and may cause brake dragging.

Hint 2

Vaccum

Front 3

There are signs of paint removal and peeling on the power brake booster right below the master cylinder. The cause of this could be:

Back 3

A leaking secondary cup on the primary piston could cause an external leak at the master cylinder. Because brake fluid tends to destroy paint, the peeling paint could be a good indication of a brake fluid leak.

Hint 3

Piston

Front 4

If the ABS light is on, does that mean your brakes won't work?

Back 4

No, It means something is wrong with the ABS system and it has been disabled.

Front 5

When removing the master cylinder, all of the following steps must be performed EXCEPT:

A)Relieve any vacuum boost B)pressure (if equipped with power brakes).

C)Plug the ends of the brake lines to prevent fluid loss.

D)Disconnect the float level sensor. Drain the master cylinder

Back 5

Answer D is correct! All of the answer choices need to be completed prior to removing the master cylinder. Draining the master cylinder of fluid is not something that must be done. If it is done the fluid is removed only after the lines have been disconnected and capped. Fluid should not run out of the master cylinder while it’s being removed so it is easier to empty the cylinder on a bench.

Front 6

A vehicle pulls to the left during a brake application. The cause of the problem could be:

A)The right front brake linings are contaminated with grease.

B)The piston is seized in the right front brake caliper.

C)The master cylinder pistons are swollen from contaminated fluid.

D)The secondary compensating port is plugged in the master cylinder.

Back 6

Answer B is correct! The direction a vehicle pulls toward during the application of brakes is the side of the vehicle that has less braking power. If something on the right side were causing the brakes to drag or grab, the vehicle would tend to pull to the side with less braking power on the left side.

Front 7

Brake systems contain all of the following components EXCEPT:

double wall copper tubing.

high pressure rubber tubing.

double wall steel tubing.

flare nuts.

Back 7

Answer A is correct! Copper tubing should never be used in brake systems. Copper corrodes easily and can expand due to high pressures.

Front 8

Metering valve delays pressure to which set of brakes under which braking condition?

The rear brakes under light braking

The rear brakes under heavy braking

The front brakes under light braking

The front brakes under heavy braking

Back 8

Answer C is correct! A metering valve is used on systems with front disc and rear drum brakes. During brake application, the fluid pressure must overcome the force of the brake shoe return springs and force the shoes outward.

Front 9

How should you test the brake warning light circuit?

Back 9

An easy way to check the operation of the brake warning light circuit is to disconnect the wire to the switch and temporarily ground it. If the circuit is fine, the lamp will light when grounded. This is what the switch should do when it is working normally.

Front 10

During a surge bleeding procedure: The end of the bleeder hose must be kept above the level of the fluid in the container.

Pump the pedal quickly several times with the bleeder screw closed.

Pump the pedal quickly several times while opening the bleeder screw.

Decrease the pressure bleeder chamber pressure to 10 psi (69 kPa)

Back 10

In order to move the air that may be trapped in the brake system, pressure must be built up to force the air out when the system is opened.

Front 11

A vehicle experiences brake squeal during brake application. Technician A says the drums may be distorted. Technician B says the backing plates may be bent. Who is right?

Back 11

Both technicians are right. Brake squeal may be caused by bent backing plates, distorted drums, loose linings, improper position of the linings on the shoes, weak or broken hold down springs, or loose wheel bearings.

Front 12

All of the following statements are true about brake drum inside diameter measurements with a brake drum micrometer EXCEPT:A) The drum should be cleaned before measuring the diameter.

B)If the drum diameter is less than specified, replace the drum.

C)The diameter should be measured at two locations around the drum.

D)The drum diameter variation should not exceed 0.035 in (0.009 mm).

Back 12

Answer B is correct! In this except-type question, all of the statements are true except B. If the inside diameter of a drum is less than specifications, it should not be replaced. IN fact it is fine providing the shoes fit inside the diameter.

Front 13

A hydro boost brake system has reduced braking performance. Tech A says to check the power steering system. Tech B says to check the vacuum check valve. Who is correct?

Back 13

Tech A is correct, the power steering pump produces pressure for the hydo boost unit.

Front 14

A vehicle with power assisted brakes has a hard brake pedal. Which of the following is least likely to cause this condition?

Master cylinder

Vaccum check valve

Brake booster

Low manifold vaccum

Back 14

Faulty master cylinders do not typically result in a hard pedal. Actually it's more common for a faulty master cylinder to cause a low brake pedal that fades to the floor as it is applied.

Front 15

A vehicle pulls to the left only when the brakes are applied. This condition is most likely caused by what?

Back 15

A frozen right caliper will cause the vehicle to pull to the left when braking.

Front 16

Leaking master cylinder cup seals result in an internal leak causing what?

Back 16

A loss in pressure and the pedal to fade to the floor when braking.

Front 17

A restriction in the left front brake line will cause what?

Back 17

The left front brake to drag after the brakes are released. This is because after the pedal is released, hydraulic pressure remains on the caliper side of the restriction leaving the left brake unit partially engaged.

Front 18

If a metering valve is stuck open what condition occurs?

Back 18

If the valve sticks, the vehicle will suffer from a lack of stopping power. This is because the front brakes are not receiving full pressure.

Front 19

The front brakes of a vehicle with a front disc rear drum brake system skid when the brakes are first applied. Which of these is causing this skid condition. A. Proportioning valve. B. Metering valve. C. Pressure differential switch. D. Contaminated brake fluid.

Back 19

Answer B is correct. The metering valve delays hydraulic pressure to the front brakes and gives the system a chance to overcome rear drum spring tension. The metering valve helps achieve balanced braking.

Front 20

A height sensing proportioning valve controls pressure to the rear brakes. It is used to prevent

Back 20

Rear wheel lock up

Front 21

What does a pressure differential switch warns the driver of?

Back 21

A possible hydraulic leak in the system.

Front 22

Contaminated brake fluid would affect,

Back 22

Both front and rear brakes.

Front 23

All of the following indicate that wheel bearings need service.

Back 23

1)A growling sound that increases with cornering loads2)A body vibration that occurs when the brakes are applied3)Roughness, grease seal leakage, and excessive axial play.

Front 24

When first testing a car equipped with ABS, it is important to

Back 24

Note the status of the ABS warning light.

Front 25

Proportioning or equalizer valves are mounted

Back 25

Between master cylinder and wheels

Front 26

Proportioning or metering valves serve what purpose?

Back 26

To reduce pressure to the rear brakes, so that the wheels dont lock up.

Front 27

What is a split diagonal brake system

Back 27

Left front and right rear brakes are on one hydraulic line. Left rear and right front are on another brake line.

Front 28

Brake fade is what?

Back 28

Brake fade is the loss of stopping power that occurs when excessive heat reduces friction between brake shoe linings and drum.