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AMT 112 Brakes Final
A study set for the upcoming written final. All questions are from the 4 quizze.
| Question | Answer |
|---|---|
| Technician A states the time to change brake fluid is when it starts to turn dark in color. Technician B states brake fluid can absorb enough moisture in 2 years to lower the boiling point to a dangerous level. Who is correct? | Technician B |
| Technician A states some cars use electrically activated parking brakes. Technician B states there are testers that show the amount of moisture present in brake fluid. Who is correct? | Both Technician A & B |
| Technician A states a bubble flare is usually used on metric line. Technician B copper / nickel line is more corrosion resistant and bendable than steel brake lines. Who is correct? | Technician B |
| Technician A states that you can use a single flare on brake lines but not on fuel lines. Technician B states the three types of power brake systems are vacuum, hydraulic, and cable. Who is correct? | Technician B |
| Technician A states DOT 4 fluid is better than DOT 3 fluid. Technician B states the purpose of a quick take-up master cylinders is to use a small than normal piston to move a larger volume of fluid on initial application of the brake pedal. Who is correct | Technician A |
| Technician A states that since water does not compress a brake system with excess moisture will create a harder than normal brake pedal feel. Technician B states that a master cylinder uses cup seals to create pressure. Who is correct? | Technician B |
| Technician A states the DOT 5 can be mixed with both DOT 3 & 4. Technician B states DOT 5.1 is a silicone based and is not compatible with DOT 3 or 4. Who is correct? | Neither Technician A or B |
| Technician A states a proportioning valve keeps rear drum brakes from locking up by shifting more pressure to the fronts as heavy braking occurs. Technician B states a metering valve is found on a front disc rear drum vehicles. Who is correct? | Both Technician A & B |
| Technician A state the brake fade occurs when the brake pads are really cold and goes away once they warm up. Technician B states vented rotors help clear the off-gassing from the brake pads during a heavy stop. Who is correct? | Technician B |
| Technician A states that drilled rotors are to allow gasses to escape when the brake pads get too hot. Technician B states slots in brake pads help with vibration as well as allows brake dust to escape. Who is correct? | Both Technician A & B |
| Technician A states the lower coefficient of friction on a brake pad the easier the car will stop. Technician B states there is only one coefficient of friction available for each car which is decided by the engineers. Who is correct? | Neither Technician A or B |
| Technician A states vacuum boosters use engine vacuum to assist in braking. Technician B states vacuum boosters use atmospheric pressure to assist in braking. Who is correct? | Both Technician A & B |
| Technician A states air in the line will cause a spongy brake pedal. Technician B states loss of hydraulic pressure in one channel of the brake system could cause the pressure differential switch to move to one side. Who is correct? | Both Technician A & B |
| Technician A states a metering valve allows the rear drum brakes to apply before allowing pressure to the front disc brakes. Technician B states a pressure differential switch may turn on the red brake light. Who is correct? | Technician B |
| Technician A states a fair amount of wetness outside a wheel cylinder is normal as long as it's not dripping on the shoes. Technician B states you need to pull back the wheel cylinder dust boot to properly check for leakage. Who is Correct? | Technician B |
| Technician A states the wedging action of Duo-Servo drum brakes is called self-energizing. Technician B states a leading trailing system has a bigger secondary shoe. Who is correct? | Technician A |
| Technician A states cleaning of drum brake dust can be done with low pressure shop air. Technician B states drum taper that is out of spec may be able to be refinished. Who is correct? | Technician B |
| Technician A states the backing plate supports the brake shoes and other brake hardware. Technician B states the shoe support pads on the backing plate need to be cleaned but NOT lubricated. Who is correct? | Technician A |
| Technician A states incorrectly adjusted brake shoes can result in further than normal pedal travel. Technician B states brake shoes adjusted too tightly can cause an overheated drum. Who is correct? | Both Technician A & B |
| Technician A states when a rear drum is off, stepping on the brake pedal can blow the wheel cylinders out. Technician B states "when a caliper is off, stepping on the brake pedal can blow the caliper piston out." Who is correct? | Neither Technician A or B |
| Technician A states there are three drum measurements you need to take in order to accurately asses if the drum is safe to use. Technician B states cleaning of drum brake dust should be done with low pressure water. Who is correct? | Both Technician A & B |
| Technician A states a Duo-Servo brake system has a larger inside pad. Technician B states a Duo-Servo system has a primary and secondary shoe. Who is correct? | Technician B |
| Technician A states drum brake return springs are interchangeable. Technician B states all drums are non-vented. Who is correct? | Neither Technician A or B |
| Technician A states a correctly adjusted parking brake will allow about 12 -14 clicks. Technician B states a Duo-Servo brake system has a smaller primary shoe. Who is correct? | Technician B |
| Technician A states the brake strut is used during parking brake engagement. Technician B states the brake strut is incorporated with the star wheel adjuster on leading trailing brake systems. Who is correct? | Technician B |
| Technician A states many performance cars use fixed caliper systems. Technician B states some disc brake systems use a fixed rotor. Who is correct? | Both Technician A & B |
| Technician A states drilled rotors allow venting of gasses as well as heat dissipation. Technician B states some rotors are drilled and slotted. Who is correct? | Both Technician A & B |
| Technician A states the rotor must be rotating away from the squealer tab in order to for the tab to work. Technician B states later run out is caused by disc thickness variation. Who is correct? | Technician B |
| Technician B states in a floating caliper system the caliper moves when the brakes are applied. Technician B states in a fixed caliper system, the rotors slides back and forth when the brakes are applied. Who is correct? | Technician A |
| Technician A states air in the brake system will eventually work it's way out. Technician B states measuring for the (wobble) of the rotor is called lateral run-out. Who is correct? | Technician B |
| Technician A states disc brakes are less likely to cause pulling problems. Technician B states disc brake rotors can be vented or non-vented. Who is correct? | Both Technician A & B |
| A customer's LF pads show inside pad has heavy wear and the outside pad is like new. Technician A states the LF brake hose may be faulty. Technician B states LF brake caliper slide pins could be seized. Who is correct? | Technician B |
| Technician A states you can gently hang a caliper by the brake hose. Technician B states there is a marking along all brake hoses to ensure they are not twisted. Who is correct? | Technician B |
| Technician A states some disc brake systems use a floating rotor. Technician B states some high end cars use ceramic rotors with carbon ceramic brake pads. Who is correct? | Both Technician A & B |
| Technician A states LRO Lateral Run Out is when the rotor measures different thicknesses. Technician B states low drag calipers may have a spring type part pushing the pads away from the rotor slightly. Who is correct? | Technician B |
| A customer's left front pads show the inside pad is heavily worn the outside pad is like new. Technician A states piston could be seized. Technician B states the slide pins could be seized. Who is correct? | Technician B |
| Technician A states a benefit of slotted rotors is to keep pads wearing flat. Technician B states a square cut o-ring is responsible for retracting the piston when brakes are released. Who is correct? | Both Technician A & B |
| A customer's LF pads show heavy wear the RF pads are like new. Technician A states the RF brake hose could be faulty. Technician B states LF brake hose could be faulty. Who is correct? | Both Technician A & B |
| Technician A states we check DTV Disk Thickness Variation but measuring the thickness of 4 spots around the rotor. Technician B states measuring for the (wobble) of the rotor is called lateral run out. Who is correct? | Technician B |
| A customer's LF pads show heavy wear the RF pads are like new. Technician A states the RF caliper piston could be seized. Technician B states LF brake caliper could be seized. Who is correct? | Technician B |
| Technician A states disc brakes are more resistant to heat and water fade. Technician B states disc brake calipers automatically adjust. Who is correct? | Both Technician A & B |
| Technician A states the ABS system can pulse the brakes up to 15 times per second to prevent wheel lockup. Technician B states the ABS system uses a yaw rate sensor to detect wheel lockup . Who is correct? | Technician A |
| Technician A states during ABS braking the pedal may have rapid pulsations. Technician B states the ABS system is put into ready mode when the brake pedal is depressed. Who is correct? | Both Technician A & B |
| Technician A states the ABS targeted slip rate is around 10-30%. Technician B states the purpose is to maintain directional control. Who is correct? | Both Technician A & B |
| Technician A says a 4 wabs system uses 2 wss's, one in the front and one in the rear to detect wheel lockup. Technician B says you should refer to SI before working on an ABS system with high pressure fluid. Who is correct? | Technician B |
| Technician A states an ESC system may use the ABS hydraulic unit to apply the inside brakes during cornering. Technician B states the traction control system may apply the brakes when trying to accelerate on a slippery surface. Who is correct? | Both Technician A & B |
| Technician A states 3 channel ABS system were popular on pick up trucks. Technician B states the traction control system may de-tune the engine in order to keep the tires from spinning violently. Who is correct? | Both Technician A & B |
| Technician A states the purpose of ABS is to stop in a shorter distance. Technician B states the brake pedal may be lower than normal during ABS braking. Who is correct? | Technician B |
Created by:
ASB23
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