CDX Brakes Final

When the brake pedal is depressed, a pushrod transfers the force to a hydraulic master cylinder through the:

brake booster.

All of the following statements with respect to the disc brake system are true EXCEPT:

drum brakes require higher applied forces than disc brakes.

All of the following statements with respect to wear indicators are true EXCEPT:

electrical contacts cannot be manufactured into the pad, so they have to be clipped to the pad.

Medium and heavy duty vehicles often require increased baking in situations where friction brakes overheat and fail. This can be addressed by using an:

exhaust brake

All of the following statements referring to disc brake calipers are true EXCEPT:

fixed calipers are the most common type used in passenger vehicles.

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.

The kind of brake fade caused by the brake fluid becoming so hot that it boils is:

hydraulic fade

If we triple the speed of an object, the kinetic energy will:

increase by nine times.

A brake system metering valve:

is used to hold off the application of the front brakes on vehicles with rear drum brakes.

All of the following are properties of DOT 3 and DOT 4 brake fluid, EXCEPT:

it is not harmful to painted surfaces.

All of the following are parts of the hydraulic brake system, EXCEPT:

parking brake assembly.

Disc brake systems that are equipped with low-drag brake calipers use:

quick take-up master cylinders.

The brake pedal uses leverage:

to multiply the force applied to the master cylinder.

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.

All of the following statements with respect to brake systems are true EXCEPT:

trailing shoes are self-energizing.

The booster receives approximately _____ of vacuum from the intake manifold.

20"

If 100 psi of working pressure is applied to a 2 square inch output piston, how much force will be created?

200 lb

Vacuum boosters consist of all of the following components EXCEPT _____.

A combination valve

As a safety measure, part of the hydraulic booster system includes an _____, which assists in maintaining a reserve of system pressure.

Accumulator

If the brake pedal is squishy (soft or spongy), there is a good chance that the hydraulic braking system has _____ in it and needs to be bled.

Air

Which of the following is used on heavy vehicles and is commonly called air brake?

Air operated braking system

Brake hoses should never be?

All of the above

Brake systems not repaired properly can cause which of the following?

All of the above

Repeated exposure to _____ particles can lead to asbestosis and lung cancer.

Asbestos

When _____ is used in brake materials, small need like fibers can break off and embed themselves deep within lung tissue, causing scarring.

Asbestos

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 is 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 chrome plated pistons resist rust. Tech B says that pistons made of phenolic resin do not corrode and transmit less heat. Who is correct?

Both A and B

Tech A says that friction brakes can fade due to overheating of the brake lining. Tech B says that friction brakes can fade due to overheating of the brake fluid. Who is correct?

Both A and B

Tech A says that hydraulic braking systems use proportioning valves and metering valves. Tech B says that hydraulic braking systems use pressure differential valves, or anti-lock hydraulic control units to modify hydraulic pressure. Who is correct?

Both A and 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 rotor should be measured for thickness variation (parallelism). Tech B says that rotors should be measured for lateral runout. Who is correct?

Both A and B

Tech A says that some vehicles are equipped with a spring steel brake pad wear indicator that drags on the rotor when the lining thickness is low. Tech B says that some vehicles are equipped with an electric brake pad wear sensor that activates a warning on the dash. Who is correct?

Both A and B

Tech A says that some vehicles use fixed calipers. Tech B says that some vehicles use sliding/floating calipers. Who is correct?

Both A and B

Tech A says that technicians have been successfully sued for improper brake repairs, resulting in large cash settlements. Tech B says that to reduce liability, good technicians create processes to help ensure steps of the job are not forgotten. Who is correct?

Both A and B

Tech A says that the heavier a 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 states that improperly repaired brakes can function reasonably well under normal driving situations. Tech B states that improperly repaired brakes can fail during a panic situation.

Both A and B

Tech A states that shops and technicians have been successfully sued for improper brake repairs. Tech B states that this litigation can result in large cash settlements. Who is correct?

Both A and B

Technician A says that applying too much braking force can cause tires to lose traction. Technician B says that ABS systems have helped to reduce the number of vehicle accidents each year. Who is correct?

Both Technician A and Technician B

Technician A says that force is transmitted hydraulically through the brake fluid. Technician B says that by using cylinders of different sizes, forces can be increased or reduced, allowing designers to obtain the desired braking force for each wheel. Who is correct?

Both Technician A and Technician B

Technician A says that if a technician is determined to have acted maliciously, he or she can be found criminally negligent. Technician B says that technicians have been successfully sued for improperly repaired brakes. Who is correct?

Both Technician A and Technician B

Technician A says that the pressure differential switch may need to be re-centered after bleeding the brakes. Technician B says that there are several types of pressure differential switches, and each requires a different method of re-centering. Who is correct?

Both Technician A and Technician B

Which of the following statements is true with respect to brake repair:

Brake repair is equal with steering and suspension repair on the liability scale.

Which of the following primary components of the disc brake system uses hydraulic pressure from the master cylinder to apply the brake pads?

Caliper

The cycle of energy transformation in a typical vehicle is:

Chemical energy - heat energy - mechanical energy - kinetic energy

Which of these is an advantage of the disc brake system over drum brakes?

Disc brakes reduce the likelihood of brake fade.

The following edge code letters correspond to four different brake friction materials. Which of these has the lowest coefficient of friction?

EE

Power brake units on _____ engines use the vacuum produced in the intake manifold to power the brake booster.

Gasoline

A substantial leak in the _____ will prevent enough pressure from building to exert the necessary braking force.

Hydraulic system

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.

Which of the following statements is true with respect to parallelism?

It results when the rotor's thickness varies by as little as 0.0003".

As the vehicle is _____, the chassis squats on the rear suspension and the lever is moved, applying more force on the load-sensitive proportioning valve.

Loaded

Always follow the _____ procedures when servicing brake systems.

Manufacturer

A _____ transfers hydraulic fluid through lines and hoses to the wheel brake units.

Master cylinder

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

Tech A says that fixed calipers use one or more pistons only on one side of the rotor. Tech B says that sliding/fixed calipers use one or more pistons on both sides of the rotor. Who is correct?

Neither A nor 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

Technician A says that vacuum boosters use only single diaphragms to extract power from the atmospheric pressure and transmit force to the master cylinder. Technician B says that one-way vacuum check is used to prevent brake fluid from entering the vacuum booster. Who is correct?

Neither Technician A nor Technician B

Brake hoses include a tough, flexible _____ designed to resist abrasion and damage.

Outer housing jacket

All of the following should be researched before performing any brake tasks EXCEPT:

PCM wiring diagram

The _____ valve is in the master cylinder or in a separate unit in the rear brake circuit, while the _____ type is mounted on the body or on the axle, where it can respond to load changes.

Pressure-sensitive; load sensitive

Standard brake fluid is hygroscopic, which means it _____.

Readily absorbs water

By creating processes that help ensure that the steps of a brake repair job are not forgotten, helps _____.

Reduce liability

Choose the correct statement:

Riveted linings are used on heavier duty or high-performance vehicles.

Which of the following materials have the highest coefficient of friction?

Rubber and concrete

Which of these is a simple mechanical system that uses leverage to force a friction block against one or more wheels?

Scrub brake

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 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

Tech A says that a micrometer is used to measure rotor thickness variation. Tech B says that a micrometer is used to measure rotor lateral runout. Who is correct?

Tech A

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

Tech A says that disc brake pads require higher application force than drum brake shoes. Tech B says that disc brakes are self-energizing. Who is correct?

Tech A

Tech A says that disc brakes operate on the principle of friction. Tech B says that disc brakes operate on the principle of regeneration. Who is correct?

Tech A

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 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

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

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

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 the vacuum booster uses vacuum and atmospheric pressure to multiply the driver's foot pressure applied to the master cylinder push rod. Tech B says that the vacuum booster increases the vacuum in the brake system. Who is correct?

Tech A

Tech A states that TSBs need to be researched before performing a brake repair. Tech B states that TSBs need not be researched if the brake has been recently replaced. Who is correct?

Tech A

Tech A states that an issue that leads to liability is forgetting to properly tighten components. Tech B states that one can take shortcuts to save time while performing brake repair. Who is correct?

Tech A

Tech A states that brake repair is equal with steering and suspension repair on the liability scale. Tech B states that technicians are not liable for improper brake repair. 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

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 calipers use steel piston rings to seal each piston. Tech B says that calipers use a square section O-ring to seal each piston. Who is correct?

Tech B

Tech A says that if a technician performs a faulty brake job on a vehicle, he or she cannot be held liable. Tech B says that technicians can be held liable for improperly repaired brakes. Who is correct?

Tech 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 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 is correct?

Tech B

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 states that modern vehicles use asbestos as the brake material. Tech B states that asbestos is no longer used in brakes. Who is correct?

Tech B

Technician A states that forgetting to tighten the lug nuts on a wheel can lead to liability. Technician B states that improperly tightened lug nuts can function very well in panic situations. Who is correct?

Technician A

The primary brake circuit fails due to a leak in the lines. Technician A says that the driver will notice a lower than normal brake pedal and reduced braking power. Technician B says that the brake pedal will "grab" higher than normal. Who is correct?

Technician A

Choose the correct statement:

The backing plate has holes stamped in it.

In which type of parking brake does the rotor have a deeper offset than normal?

Top hat design parking brake

Repeated exposure to asbestos can lead to asbestosis and lung cancer.

True

Technicians can be found criminally negligent if they are determined to have acted maliciously.

True

True or False. Many brake hoses use banjo fittings to connect the hose to the wheel unit.

True

True or False. To ensure that a leak in one brake circuit will not affect the other circuit, master cylinder reservoirs have two separate chambers.

True

While asbestos has been removed from most brake and clutch materials, it is still present in some replacement and old components.

True

Banjo fittings are made up of all of the following components, EXCEPT:

banjo nut.