1410: Chapters 1-5
Technician A says a low fluid level in the reservoir may indicate worn brake pads or shoes. Technician B says a squirt of brake fluid from one or both master cylinder reservoir chambers when the brake pedal is applied indicates abnormal cup wear.
A
Technician A says a vehicle that has the tread wear indicators showing completely will probably hydroplane on wet roads. Technician B says the same condition should not affect braking on dry pavement.
A
Technician A says all modern vehicles have a split braking system. Technician B says that all modern vehicles use a diagonally split system.
A
Technician A says brake tubing should be double flared or ISO flared. Technician B says a special tubing seat must be used with the ISO flare.
A
Technician A says installing lowering or lift kits on trucks could affect the operation of the height-sensing proportioning valve. Technician B says the combination valve will be affected by adding a lower or lift kit to the vehicle.
A
Technician A says internal rubber parts wear with age. Technician B says internal master cylinder leaks are caused by clogged ports.
A
Technician A says that friction between the vehicles tires and the road is one factor in stopping the vehicle. Technician B says that a car with locked brakes stops in the shortest time possible.
A
Technician A says that too much torque on the lug nuts can warp a brake rotor. Technician B says that it is better to over torque the lug nuts to prevent the wheel from falling off.
A
Technician A says the assembly shown in the following figure is used to connect a flexible brake hose to a rigid steel tubing. Technician B says the clip in the following figure keeps the connection from leaking.
A
Technician A says the electrons in an electrical current are forced (pushed) through the circuit by voltage. Technician B says Ohm's Law states that one ampere is required to push one volt through one ohm of resistance.
A
Technician A says the hydraulic tubing used in the brake system is always double-wall tube, Technician B says brake tubing is coated with a tin or lead based alloy to reduce vibration.
A
Technician A says the information presented in the following figure is based on recommendations from the Rubber Manufacturers Association. Technician B says one of the two diagrams is on the vehicle's tire placard.
A
Technician A says the master cylinder changes mechanical pressure on the brake pedal to hydraulic force. Technician B says the master cylinder operates because liquids can be compressed.
A
Technician A says the proportioning valve is an integral part of the master cylinder on SOME late model vehicles. Technician B says the valve may be installed in the wheel cylinders.
A
Technician A says the stoplight switch may be on the power side of a circuit. Technician B says the stoplight switch will always be on the ground side of the circuit.
A
Technician A says a brake hose usually has a fitting that mates to a flare nut on the line. Technician B says a single flare is typical for a brake line.
A
Trailer brakes are being discussed. Technician A says that hydraulic surge brakes are typically used on RV unites. Technician B says that electric brakes are typically used on utility trailers.
B
The normal operation of a dual-piston master cylinder is being discussed. Technician A says the secondary piston is moved by the pushrod. Technician B says the primary piston produces the pressure to move the secondary piston.
B
Tire construction is being discussed. Technician A says a radial ply tire has the cords parallel to the tread. Technician B says strengthening belts are added between the radial plies and the tread.
B
Brake balance is being discussed. Technician A says this is a serious problem with small rear-wheel drive pickup trucks. Technician B says brake balance is the braking force between the front and rear brakes.
both
Brake fade is being discussed. Technician A says a layer of gas between mating friction surfaces could cause brake fading. Technician B says heat is the greatest cause of brake fade.
both
Brake systems are being discussed. Technician A says the service brakes may be drum or disc. Technician B says ABS does not slow a vehicle faster but allows for better control of the vehicle.
both
Electrical theory is being discussed. Technician A says a series-parallel circuit may have loads in parallel with each other. Technician B says a series-parallel circuit may have loads in series with parallel loads.
both
Filling a master cylinder is being discussed. Technician A says to fill the master cylinder to the fill mark on the reservoir. Technician B says some master cylinders may have markings on the inside of the reservoir.
both
Hydraulic theory is being discussed. Technician A says a small piston can more a larger piston and generate a large output force. Technician B says when output forces increase, output movement decreases.
both
Pushrod adjustment is being discussed. Technician A says a loss of braking power can result if the pushrod adjustment is too short. Technician B says a noise from the brake booster can result if the pushrod adjustment is too short.
both
Quick take-up master cylinders are being discussed. Technician A says this type of master cylinder keeps the pads away from the rotor. Technician B says they help increase fuel mileage.
both
Technician A says a bearing and race should be replaced together. Technician B says a light coat of oil on the fingers may prevent bearing damage from acid.
both
Technician A says a bias ply tire will have a more rigid sidewall than a radial ply tire. Technician B says the design of a radial ply tire may cause the sidewalls to bulge even with recommended pressure.
both
Technician A says a dial indicator should be used to check tire and wheel lateral runout. Technician B says a dial indicator should be used to check tire and wheel radial runout.
both
Technician A says a low pedal may be caused by air in the hydraulic system. Technician B says a low pedal may be caused by improperly adjusted shoes.
both
Technician A says a small ripple in the reservoirs as the brakes are being applied is normal. Technician B says a small geyser in the reservoirs as the brakes are being applied is normal.
both
Technician A says a worn ball joint may cause the wheel assembly to jerk as the brakes are applied. Technician B says a worn ball joint may cause the vehicle to pull in that direction as the brakes are applied.
both
Technician A says disc brakes are more effective than drum brakes. Technician B says disc brakes require more apply pressure than drum brakes.
both
Technician A says dragging brakes may be caused by insufficient brake pedal free play. Technician B says free play is defined as the distance the brake pedal moves before the master cylinder primary piston moves.
both
Technician A says if the fluid rises in one reservoir during brake application, then the cup on the opposite piston is leaking. Technician B says is the fluid rises in one section and drops in the other reservoir section, then one of the replenishing ports is clogged.
both
Technician A says improper toe on one rear wheel will create a steering effect from the rear axle. Technician B says setback is usually caused by an accident.
both
Technician A says inertia applies to objects in motion or at rest. Technician B says inertia creates or is part of static friction.
both
Technician A says moisture in the brake fluid will corrode metal components. Technician B says rubber components will be deteriorated by water in the fluid.
both
Technician A says one piston of a dual master cylinder may supply pressure to one front wheel and one rear wheel. Technician B says a piston may supply pressure only to the brakes on one axle.
both
Technician A says reducing the amount of force needed to move an object lowers the coefficient of friction. Technician B says coefficient of friction is the relationship of tensile force to weight.
both
Technician A says the brake warning light will remain on with the ignition in the RUN position if the parking brake is partially applied. Technician B says a low brake fluid level in the master cylinder may cause the brake warning light to come on.
both
Technician A says the master cylinder reservoir may be a one-piece unit with the cylinder body. Technician B says the master cylinder reservoir may be a separate plastic container.
both
Technician A says the switch in the following figure is a pressure differential valve. Technician B says the switch in the following figure is sometimes part of a combination valve.
both
Technician A says the thrust angle is based on the geometric centerline. Technician B says the thrust line is the direction in which the rear wheels are pointing.
both
Technician A says the wheel seal is removed with a seal puller claw. Technician B says the inner bearing is removed after the seal is removed.
both
The results of a metering valve pressure test are being discussed. Technician a says the valve is functioning properly when it closed at 25 psi. Technician B says the valve is functioning properly when it reopened at 275 psi.
both
Tire load ratings are being discussed. Technician A says bias ply tires can carry a larger load than radials. Technician B says a light vehicle may use 8-ply bias ply tires.
both
Tire pressure monitoring systems are being discussed. Technician A says pressure sensors may be part of the valve stem. Technician B says some TPM systems do not use pressure sensors.
both
Electronic braking includes which of the following systems?
both A and B
The operation of a height-sensing proportioning valve can be affected by the installation of:
both A and B
Which of the following materials is used for brake lines?
both A and B
Which of the following statements are true? A. Inertia is best described as the resistance to a change in motion. B. Momentum is the force of continuing motion.
both A and B
Toe-out on turns is:
both B and C
When would it be desirable to use a lever or gear type bender instead of a bending coil spring?
both B and C
Which of the following type of brake fade occurs when the friction material overheats to the point and which the coefficient of friction declines severely.
lining fade
The typical mechanical components of a hydraulic brake system include all of the following except:
master cylinder
If a lower tire profile is desired, then the tire's aspect ratio
must be lower (smaller)
Brake fluid flushing is being discussed. Technician A says all manufacturers require fluid to be flushed at certain intervals. Technician B says to flush the system with clean water before adding fresh brake fluid.
neither
Dual master cylinders are being discussed. Technician A says this system is so named because of the two master cylinders. Technician B says dual master cylinders use two separate bores.
neither
Rear wheel ABS systems are being discussed. Technician A says the driver may have to reduce brake pedal force slightly during a panic stop. Technician B says the driver may not be able to steer the vehicle during a panic stop.
neither
Replacing rubber brake hose is being discussed. Technician A says a longer hose may be used as a replacement. Technician B says the hose may be twisted to clear suspension parts.
neither
Technician A says metric and English fittings may be interchanged. Technician B says a double flare fitting may be used to replace an ISO fitting.
neither
Technician A says moisture found under the boot of a metering valve requires that the valve be replaced. Technician B says to test a metering valve it must be held open by a special tool.
neither
Technician A says moisture in the brake fluid will increase pressure without having to increase pedal force. Technician B says moisture (water) will improve the flow of brake fluid.
neither
Technician A says servo action is accomplished by the opposing forces of the two disc pads per wheel. Technician B says drum brakes require higher pressure because their shape is similar to that of the drum.
neither
Technician A says that flushing the brakes is the removal of air from the system and that not all the wheels are necessarily flushed. Technician B says that bleeding the system is the complete replacement of all system brake fluid with new fluid.
neither
Technician A says that mass is a measurement of gravity acting on an object. Technician B says that weight is a measurement of the number of molecules that make up an object.
neither
Technician A says the parking brake should slow the vehicle as well as the rear axle service brake. Technician B says the vehicle parked on a slight (less than 25 degrees) slope requires about 125 foot-pounds of force applied to the pedal or lever.
neither
Technician A says the same tool could be used to make ISO and double flare fittings. Technician B says ISO flares may be sized in US customary (English) measurements.
neither
Technician A says wear-indicating ball joints have a marked rule scale so the amount of wear is measureable. Technician B says most steering linkage ball-type joints have some type of a wear measuring device.
neither
Technician A says worn ball joints may cause the toe angle to change during braking. Technician B says damaged or worn strut bushings may also cause the toe angle to change during braking.
neither
DOT 5 brake fluids may be mixed with or used to replace DOT ___ brake fluids.
none of the above
Cups are installed on the master cylinder:
pistons
Part A in the illustration:
prevents the nut from loosening
The fluid flow shown in the illustration occurs when the brakes are
released
Trailer brakes do not apply when the vehicle is moving in a ___ direction.
reverse
The major hydraulic components of a typical light vehicle brake system include all of the following except:
rotors
Most brake pedal installations are an example of what is called a ___-class lever.
second
Boat trailers do not use electric braking because water ___ the expected life span of the electrical components.
shortens
Air brakes are applied by ___ pressure and released by an increase in ___ pressure.
spring, air
The quick take-up master cylinder is a kind of ___ master cylinder designed for some types of front-wheel drive cars.
step bore
All of the following may cause the brake warning light to illuminate except:
the ignition key in the on position
Which of the following statements about parking brake function is true?
the main purpose is to prevent the vehicle from moving after it is stopped
Brake pedal is increased by all of the following except:
the size of the brake rotor
An electrical circuit using 12 volts and having 10 ohms of resistance would have a current of:
1.2 amperes
A brake pedal assembly has a 9-inch lever and the master cylinder pushrod is 1.5 inches from the fulcrum. If the driver applies 50 pounds of force to the pedal, how much force will be applied to the master cylinder?
300 pounds
Bearing removal is being discussed. Technician A says blocks should be used to support the hub. Technician B says a large blunt pin punch should be used to drive the bearing out.
A
Brake friction materials are being discussed. Technician A says molding bits of metal into a brake lining produces an excellent friction material. Technician B says composite linings are made from organic fibers or materials.
A
Brake tubing is being discussed. Technician A says tubing vibration could cause metal fatigue. Technician B says copper tubing may be used as brake tubing.
A
Brake warning lights are being discussed. Technician A says a pressure differential in the brake system will switch on the light. Technician B says a typical switch for this light is tripped by vacuum.
A
Proportioning valves are being discussed. Technician A says proportioning valves are used on vehicles with rear disc brakes. Technician B says the valve is used to increase hydraulic pressure to the rear brakes.
A
A 20-gauge AWG wire is being replaced. Technician A says a 22-gauge wire may be used as a replacement. Technician B says an equivalent size metric gauge wire may be used.
B
Brake lamp bulb replacement is being discussed. Technician A says the lens assembly must be removed first. Technician B says the bulb must be twisted to remove it.
B
Brake operational theories are being discussed. Technician A says an object at rest creates kinetic energy. Technician B says kinetic friction is created when the brakes are applied.
B
Brake service is being discussed. Technician A says the first item to be removed after the wheel assembly and caliper, if equipped, is the nut lock and adjusting nut. Technician B says the thrust washer is removed with the hub.
B
Mass is being discussed. Technician A says that the mass of an object is equal to the weight of an object. Technician B says that mass is the amount of matter than an object contains.
B
Pressure bleeding is being discussed. Technician A says to pump the brake pedal several times during the bleed procedure. Technician B says to hold the metering valve open during the bleed procedure.
B
Technician A says DOT 3 and DOT 4 brake fluids have a higher boiling point than DOT 5.1. Technician B says DOT 5.1 long-life has a higher wet boiling point than DOT 5.1.
B
Technician A says a composite-type master cylinder is made of cast iron. Technician B says a composite master cylinder has a removable reservoir chamber.
B
Technician A says a dual master cylinder uses two matching primary pistons. Technician B says the pistons can create separate pressures in some instances.
B
Technician A says a typical service for double-row ball bearings is cleaning and packing. Technician B says tapered roller bearings are normally serviced during brake repairs.
B
Technician A says all pressure differential valves must be recentered after bleeding. Technician B says a centering spring is used on some pressure differential valves.
B
Technician A says an electrical circuit must have amperage in order for the voltage to perform work. Technician B says a lack of resistance in an electrical device (load) will prevent any work from being performed.
B
Technician A says force on the brake pedal is transmitted directly to the wheels by linkage. Technician B says pedal force is transmitted by hydraulic pressure generated in the master cylinder.
B
Technician A says placing a smaller-than-recommended tire on the front axle will cause RWAL problems. Technician B says placing two different size tires on the same axle may cause the ABS to think one wheel is locking.
B
Technician A says the best hydraulic connection between the vehicle frame and the wheel assembly is a soft metal tubing. Technician B says a specific type of defect in a flexible brake hose may prevent that brake from applying.
B
Technician A says the first check of the suspension should be with the vehicle supported on a lift. Technician B says the first suspension condition to be inspected should be the springs.
B
Technician A says the operation depicted in the following figure is the final step in pre-loading the wheel bearing. Technician B says the next step after the one shown uses a torque wrench.
B
Technician A says the typical wheel cylinder piston is slightly larger than a caliper piston. Technician B says some of a drum brake's force may be increased by the rotation of the drum.
B
A vehicle pulls towards the left during braking. Which of the following would be the most likely cause?
Left camber 2 degrees, right camber .25 degrees
Each of the following is part of the vehicle's gross vehicle weight except:
all fluids removed
In a sealed hydraulic system, brake fluid is compressed to:
all of the above
Oil or petroleum based solvents can cause the brake system rubber components to
all of the above
Perpetual energy is:
all of the above
The brake pedal mechanism is:
all of the above
Which of the following factors affect the coefficient of friction in a brake system?
all of the above
Factor(s) that will directly affect braking on a wheel is/are:
any of the above
All of the following statements about bench bleeding master cylinders are true except:
bench bleeding is most effective when the fluid is allowed to squirt out onto the bench
A vehicle has brakes that are dragging. Technician A says the fluid level may be too high. Technician B says the pushrod may be misadjusted.
both
Which of the following is the most effective design of drum brakes?
internal-expanding
In the following figure, which of the two items (A or B) indicates a worn ball joint?
item A
Air brake systems use ___ to control the movement of a diaphragm.
compressed air
A step bore master cylinder has two different sizes of:
cylinder bores
Which of the following materials are used for brake fluid lines?
double-walled steel
All of the following are types of brake fade except:
drum
To inspect ball joints that do not have wear indicators, the technician must:
either A or C
All of the following are types of tubing fittings except:
floating
A true statement of hydraulic principles would not include which of the following facts
fluids all have the same viscosity
The operation depicted in the following figure is:
hand packing the bearing
Trailer brakes may be one of two types; ___ or ___.
hydraulic, electric
Brake hose diameter is usually specified as the ___ diameter of the hose.
inside
Which of the following conditions is most likely to cause steering problems during braking on a factory-equipped vehicle?
tire inflation
___ braking systems apply in case the trailer disconnects from the tow vehicle.
trailer breakaway
All of the following types of wire repair are considered permanent repairs except:
using a tap connector
Active Braking refers to the braking system having the capability of applying the brakes on one or more wheels without input from the driver. This is accomplished by using ___, yaw sensors, and actuators.
wheel speed sensors