AUMT1410SEC4
A vehicle has no brake boost until the engine has run for a few seconds: Technician A says that the vacuum check valve is leaking. Technician B says that the engine is just worn out and cannot hold a vacuum during shutdown. Who is correct?
A only
Power brake boosters are being discussed: Technician A says power brake boosters do not alter the basic brake system. Technician B says all boosters have a power reserve to provide at least one power-assisted stop if power is lost. Who is correct?
A only
Technician A says that if a vacuum booster is in good condition, starting the engine after the vacuum is exhausted should cause the brake pedal to drop slightly under foot pressure. Technician B says that the pedal should pulsate lightly after it drops. Who is correct?
A only
Technician A says that some electric parking brakes use a special feature called auto-hold. Technician B says that some electric parking brakes may be applied by moving the vehicle Who is correct?
A only
Technician A says that the shoes and linings of auxiliary (drum in hat) drum Parking brakes usually outlive the vehicle on which they are installed. Technician B says that the small drum for the auxiliary parking brakes can be machined just like a regular brake drum. Who is correct?
A only
Technician A says that when the brakes are released, vacuum is on both sides of the booster diaphragm. Technician B says that when the brakes are released, atmospheric pressure may be on one side of the booster diaphragm. Who is correct?
A only
Technician A says that whenever a hydro- boost is serviced the power steering system must be bled. Technician B says that power steering fluid and brake fluid are interchangeable in the hydro- boost system in small amounts. Who is correct?
A only
Technician A says the amount of braking power from a vacuum booster is directly related to the area of the diaphragm. Technician B says a booster with a small diaphragm would provide more power assist. Who is correct?
A only
Technician A the accumulator of a hydro- boost system holds more than 1 , 000 psi of hydraulic pressure. Technician B says before removing the hydro- boost, discharge the accumulator by firmly applying the brake pedal twice with the engine off. Who is correct?
A only
Servicing a system with EHB is being discussed. Technician A says servicing these systems is no different from servicing conventional systems. Technician B says some EHB systems have no vacuum booster. Who is correct?
B only
Tandem brake boosters are being discussed: Technician A says tandem diaphragm boosters use one large diaphragm. Technician B says that a tandem diaphragm can provide more brake boosting power in a smaller housing. Who is correct?
B only
Technician A says a vacuum brake booster needs at least 10 in. Hg of vacuum for proper operation. Technician B says modern vacuum boosters are vacuum- suspended units. Who is correct?
B only
Technician A says if the EHB should fail completely, the vehicle will have to be towed to the nearest shop. Technician B says the driver can stop the vehicle but may have to press on the pedal harder than normal. Who is correct?
B only
Technician A says that a vehicle with hydro- boost may have a hard pedal if the pressure switch is open. Technician B says that a hydro- boost system may lose boost if the drive belt is slick or loose. Who is correct?
B only
Technician A says that the EHB system is a direct power booster. Technician B says the EHB and the BA units share information with the ABS, TCS, and electronic suspension. Who is correct?
B only
Technician A says that the check valve in the booster is used to keep atmospheric air pressure from leaking from the booster when the brakes are applied. Technician B says that the check valve is used to keep vacuum from being lost from the booster when the engine is turned off. Who is correct?
B only
Technician A says that the parking brakes are provided with equal cable tension by the cable adjusters. Technician B says that the parking brakes are provided with equal cable tension by the equalizer. Who is correct?
B only
Technician A says that the tandem- diaphragm booster will have no loss of boost even if one diaphragm is leaking. Technician B says tandem boosters allow more surface area for booster operation. Who is correct?
B only
Technician A says that vacuum is exhausted through the check valve from the booster as soon as the engine is turned off. Technician B says that vacuum is on both sides of the booster diaphragm when the engine is turned off. Who is correct?
B only
While discussing a Chrysler vehicle equipped with ESP: Technician A says testing a vacuum booster on these vehicles requires a scan tool and a vacuum gauge. Technician B says care must be taken to prevent damage to the stoplamp switch on these vehicles. Who is correct?
B only
While discussing the adjustment of the master cylinder pushrod on a Honda: Technician A says never remove the master cylinder from the vehicle to install the special tool. Technician B says a feeler gage is used to measure the gap between the adjusting nut and the gauge body. Who is correct?
B only
While lubricating the parking brake system: Technician A applies graphite to the contact areas of plastic-coated cables. Technician B applies a quality grease to metal cables. Who is correct?
B only
Replacement of a hydraulic brake actuator is being discussed: Technician A says the brake actuator replacement procedure is much like a conventional vacuum booster. Technician B says to check brake pedal height and free play on installing a new actuator. Who is correct?
Both A and B
Technician A says a vacuum booster can have an internal vacuum leak. Technician B says an internal vacuum leak may cause the engine to stumble when the brake is applied, along with a hissing sound around the pedal pushrod area. Who is correct?
Both A and B
Technician A says hybrid vehicles can use an electric brake booster pump used to pressurize brake fluid for use in a hydraulic booster system. Technician B says whenever a hydraulic power unit is replaced the pressure sensors must be recalibrated. Who is correct?
Both A and B
Technician A says that a screw forces the disc pads against the rotor in a rear disc parking brake system. Technician B says that a ball-and-ramp assembly forces the disc pads against the rotor in a rear disc parking brake system. Who is correct?
Both A and B
Technician A says that another name for a rear disc-drum (drum-in-hat) parking brake is auxiliary drum brake. Technician B says that another name for a rear disc-drum parking brake is integral brake. Who is correct?
Both A and B
Technician A says that it is important to remember that the parking brake is not part of the vehicle hydraulic brake system. Technician B says that it is important to remember that the parking brake is applied mechanically. Who is correct?
Both A and B
Technician A says that sometimes vacuum is on both sides of the diaphragm in a vacuum booster. Technician B says that sometimes vacuum is on one side of the diaphragm in a vacuum booster. Who is correct?
Both A and B
Technician A says that the effort of the driver when activating the foot pedal or hand lever is multiplied and is transferred on to the rear cables by the front cable. Technician B says that the effort of the driver when activating the foot pedal or hand lever is multiplied and is transferred on to the rear cables by the equalizer lever. Who is correct?
Both A and B
Technician A says that the parking brakes are usually applied through a set of cables. Technician B says that parking brakes are set by depressing the parking brake foot pedal. Who is correct?
Both A and B
Technician A says we should use an ohmmeter or continuity tester to check the brake warning lamp switch. The switch should be open, with no continuity, with the pedal or lever released. Technician B says the parking brake warning lamp switch should be closed and continuity should exist with the pedal or lever applied. Who is correct?
Both A and B
The BA system is being discussed: Technician A says that the BA system can build pressure in the brake system rapidly in case of a panic stop. Technician B says that the BA system can make a difference between vehicle control and a possible accident. Who is correct?
Both A and B
The brake pedal of a high- mileage car is sluggish and moderately hard to apply: Technician A says that vacuum leaks or restrictions may exist between the engine and the booster. Technician B says that mechanical wear or damage to the engine may have reduced the available vacuum. Who is correct?
Both A and B
All of the following statements about rear drum parking brakes are true EXCEPT: a. they make use of the rear drum brake components. b. a lever inside the drum is moved by the brake cable. c. the lever forces the wheel cylinder pistons out to force the brake shoes against the drum. d. the brake cable runs through a metal conduit that enters the drum assembly through the backing plate.
C
Technician A says that a hydro-boost system uses brake fluid for the booster. Technician B says the hydro-boost system uses power steering fluid for the brakes. Who is correct?
Neither A nor B
While discussing checking the hydro- boost operation: Technician A says to start the engine and pump the brake pedal repeatedly to bleed off the residual pressure in the accumulator to begin testing. Technician B says the brake pedal should fall away under firm pressure on the pedal. Who is correct?
Neither A nor B
