Aumt Brake Final Exam |Complete Questions with Graded A+ Answers

Aumt Brake Final Exam |Complete Questions with Graded A+ Answers Tech A says that parking brakes on drum brake vehicles use separate brake shoes for backup in an emergency. Tech B says that parking brakes on drum brake vehicles mechanically operate the standard drum brake shoes. Who iscorrect? Tech B Which of these drum brake systems uses servo action in both directions? Duo-servo drum brake systems Tech A says that brake shoe linings saturated with brake fluid from a leaky wheel cylinder can be cleaned with brake cleaner and reused as long as they aren't worn out. Tech B says that brake shoes should be replaced in axle sets. Who is correct? Tech B Tech A says that a metal-on-metal grinding noise in drum brakes generally requires replacing the brake shoes and resurfacing or replacing the drums. Tech B says that one way to help identify whether a problem is coming from the front or rear brakes is to test-drive the vehicle in a safe place at a relatively low speed and lightly apply the parking brake. Who is correct? both A and B Tech A says that most brake drums are designed to be machined if minor surface issues are present. Tech B says that brake drums can be reused if they are machined larger than specifications, as long as the surface is smooth. Who is correct? Tech A All of the following statements with respect to a wheel cylinder and piston are true EXCEPT: It is standard practice to hone out deep pits in the wheel cylinder bore. The component of the drum brake system attached to the backing plate is the: wheel cylinder Tech A says to use an air hose to clean the backing plate of dust and contamination. Tech B says to use a water-based cleaning solution to clean the backing plate of dust and contamination. Who is correct? Tech B Among the tools used to diagnose and repair drum brake systems, the wheel cylinder piston clamp is used to: hold the pistons in the wheel cylinder while the brake shoes are removed. Choose the correct statement: The backing plate has holes stamped in it. Tech A says that duo-servo brake shoes are only anchored on the top. Tech B says that duo-servo brakes typically use single-piston wheel cylinders. Who is correct? Tech A Tech A says that both secondary shoes should be installed on the passenger side of the vehicle. Tech B says that the lining on the primary shoe is typically shorter in length than the lining on the secondary shoe. Who is correct? Tech B When the driver releases the brake pedal, the brake shoes are withdrawn by the: return spring Which of the following brake tools is used to adjust brake shoes when the drum is installed? brake spoon Tech A says that when performing a brake job on the rear axle of an older vehicle, inspection finds brake fluid under the dust boot; the wheel cylinder should be replaced. Tech B says that when a drum brake return spring has failed, springs on both rear wheels need to be replaced. Who is correct? both A and B Tech A says that riveted lining is usually for heavy-duty or high-performance vehicles. Tech B says that bonded lining is glued to the metal brake shoe. Who is correct? Both A and B Choose the correct statement: Riveted linings are used on heavier duty or high-performance vehicles. All of the following statements with respect to brake systems are true EXCEPT: trailing shoes are self-energizing. Tech A says that a cleaned-up self-adjuster can be installed on either side of the vehicle. Tech B says that grease seals are meant to be reusable. Who is correct? Neither A nor B The component that prevents a direct path for water spray and dirt to enter the brake drum is the: Labyrinth seal. Tech A says that an antilock brake system (ABS) allows the front wheels to be steered during a panic stop. Tech B says that ABS sensors apply or release hydraulic pressure to the wheel brake units during ABS brake events. Who is correct? Tech A If we triple the speed of an object, the kinetic energy will: increase by nine times. All of the below statements are true EXCEPT: Service brakes consist of drum and/or disc brakes and are operated by hand. Tech A says that tire pressure does not affect braking. Tech B says that heavy vehicle loads increase stopping distance. Who is correct? Tech B Tech A says that the heavier the vehicle, the more stopping power is needed. Tech B says that the faster a vehicle is moving, the more braking power is needed. Who is correct? Both A and B Tech A says that water soaked brake shoes can be a cause of brake fade. Tech B says that disc brakes dissipate heat faster than drum brakes. Who is correct? Both A and B Tech A says that kinetic energy is created during braking to stop the vehicle. Tech B says that kinetic energy is converted to heat energy during braking. Who is correct? Tech B Tech A says that the brake pedal uses leverage to multiply foot pressure. Tech B says that when braking hard while moving forward, the vehicle's weight transfers to the rear wheels, increasing their traction. Who is correct? Tech A Which of these is a simple mechanical system that uses leverage to force a friction block against one or more wheels? Scrub brake Vehicles equipped with disc brakes incorporate a mechanically operated drum-style parking brake in the center of the rear disc brake rotors, commonly called a: top hat parking brake. Which of these is a simple mechanical system that uses leverage to force a friction block against one or more wheels? Scrub brake The cycle of energy transformation in a typical vehicle is: Chemical energy→Heat energy→Mechanical energy→Kinetic energy Tech A says that a disc brake operates by clamping friction materials to the outside of a disc. Tech B says that a drum brake operates by clamping friction materials to the outside of a drum. Who is correct? Tech A The kind of brake fade caused by the brake fluid becoming so hot that it boils is: hydraulic fade. Which of the following is used on heavy vehicles and is commonly called air brake? Air operated braking system Tech A says that light-duty service brakes are typically applied hydraulically. Tech B says that light-duty parking brakes are typically applied hydraulically. Who is correct? Tech A The brake pedal uses leverage: to multiply the force applied to the master cylinder. Disc brake systems that are equipped with low-drag brake calipers use: quick take-up master cylinders. The port that connects the reservoir to the cylinder, just barely ahead of the primary cup is the: compensating port. If 100 psi of working pressure is applied to a 2 square inch output piston, how much force will be created? 200 lb A wheel's braking ability depends most on: the load it is carrying. Tech A says that the low level brake fluid switch on a master cylinder turns on the brake warning light when the system is low on fluid. Tech B says that the low level switch also monitors the condition of the fluid and activates the warning light when the brake fluid needs to be replaced. Who is correct? Tech A All of the statements are true EXCEPT: the smaller brake caliper pistons on the front wheels give greater mechanical force and braking power to the front wheels. Different lever designs can be engineered to alter the brake pedal effort required of the driver by using different levels of: mechanical advantage. Which of the following brake fluids has the highest wet boiling point? DOT 5 Which of the following is used to hold off the application of the front brakes on vehicles with disc brakes on the front wheels and drum brakes on the rear wheels? Metering valve Tech A says that DOT 5 brake fluid should be used in all vehicles today because it is silicone based and will not absorb water. Tech B says that DOT 4 and DOT 3 are not recommended for use in ABS systems. Who is correct? Neither A nor B Tech A says that hydraulic pressure is applied equally in all directions throughout a closed system. Tech B says that air in the hydraulic system will cause the brake pedal to be spongy. Who is correct? Both A and B Tech A says that brake fluid should periodically be checked for excessive moisture content. Tech B says that brake fluid should be replaced every 12,000 miles. Who is correct? Tech A The valve that reduces rear brake pressure when the vehicle is lightly loaded and allows higher pressure when it is heavily loaded is: load-sensitive proportioning valve. Which of the following flares is created by first flaring the end of the tube outward in a Y shape? Inverted double flare Tech A says that a brake pedal that does not return all the way causes the brake warning light on the instrument panel to stay on. Tech B says that a brake pedal that does not return causes the brake lights to stay on. Who is correct? Tech B Tech A says that the metering valve controls pressure to the rear brakes. Tech B says that the proportioning valve controls pressure to the front brakes. Who is correct? Neither A nor B Tech A says that quick take-up master cylinders use two additional pistons to move brake fluid faster. Tech B says that banjo fittings are commonly used to connect brake hoses to wheel brake units. Who is correct? Tech B Tech A says that the secondary piston in a master cylinder is operated by hydraulic force. Tech B says that the brake pedal return spring returns the master cylinder pistons to their original position. Who is correct? Tech A Tech A says that input force divided by the area of the input gives working pressure. Tech B says that working pressure multiplied by the surface area of the output piston gives output force. Who is correct? Both A and B All of the following statements with respect to replacing brake lines, brake hoses, fittings, and supports are true EXCEPT: reassemble the removed components using tools only.