Chapter 24
A _____ allows for several power-assisted brake applications after vacuum ceases when the vehicle's engine is shut off. (A) vacuum reservoir (B) tandem booster (C) master cylinder check valve (D) hydraulic power brake booster
A
All of the following are components of an anti-lock brake system (ABS), except: (A) quick take-up valve. (B) control module. (C) wheel speed sensors. (D) hydraulic modulator.
A
Brake lines must be made of _____. (A) double-walled steel (B) thin-walled brass (C) bendable plastic (D) Any of the above.
A
If a 100 lb (46 kg) force is applied to a piston with 1 in2 (6.5 mm2) of area, how much pressure would a piston with an area of 10 in2 (65 mm2) exert, if both of these pistons rested with an airtight seal on a column of oil? Assume that both cylinders or columns are connected via a pipe. (A) 10 psi (69 kPa). (B) 100 psi (689 kPa). (C) 500 psi (3447 kPa). (D) 1000 psi (6895 kPa).
A
In a servo action, self-energizing drum brake arrangement, the secondary brake shoe jamming against the ____ stops both shoes and produces a binding effect that helps both shoes apply themselves. (A) anchor pin (B) retracting spring (C) star wheel adjuster (D) caliper
A
To compensate for the transfer of weight to the front wheels due to inertia when a vehicle is stopped, the vehicle's brake system is designed with a(n) _____. (A) braking ratio (B) additional brake pad on each front wheel (C) emergency brake (D) All of the above.
A
Which of the following valves controls brake hydraulic pressure to a vehicle's rear wheels? (A) Proportioning valve. (B) Master cylinder check valve. (C) Pressure differential switch. (D) Metering valve.
A
A hydraulic brake booster uses pressure generated by the _____ system. (A) cooling (B) power steering (C) engine lubrication (D) All of the above
B
A mechanically operated switch actuated by the brake pedal is one of two methods to operate a vehicle's _____. (A) transmission clutch (B) brake lights (C) hydraulic power brake booster (D) parking brakes
B
All of the following are characteristics of high-quality brake fluid, except: (A) must not swell or deteriorate the brake system's plastic and rubber parts. (B) can safely be mixed with any other type of DOT- approved brake fluid. (C) maintains even viscosity throughout a wide temperature variation. (D) acts as a lubricant for pistons, seals, and cups to reduce internal wear and friction.
B
All of the following are parts of a wheel cylinder, except: (A) two rubber cups. (B) caliper pins. (C) cast iron housing. (D) two cylinder pistons.
B
An electric parking brake may use an electric motor to pull the conventional emergency brake cable, or it may have two computer-controlled motors attached to each _____. (A) rear wheel hub (B) rear brake caliper (C) front steering knuckle (D) front brake caliper
B
Controlling the electrical flow through a hybrid vehicle's _____ is the key operational aspect of a regenerative braking system. (A) power splitter (B) motor-generator (C) converter/inverter (D) 12-volt battery
B
In a dual brake system, the dual master cylinder _____. (A) locks up one wheel on each axle when braking (B) applies pressure to separate front and rear brake hydraulic systems (C) works the transmission clutch also (D) has two master cylinders, with one positioned on top of the other
B
The three general types of self-adjusting drum brake systems are the cable, link, and _____ adjuster designs. (A) electric sensor (B) lever (C) solenoid (D) spherical
B
To prevent potential damage to the rotor, many brake pads have a mechanical or electrical sensor-type of _____. (A) caliper piston (B) pad wear indicator (C) directional installation sleeve (D) friction lining grid
B
A hydraulic brake booster uses a(n) _____ to provide reserve pressure in case the regular hydraulic system fails. (A) engine-driven pump (B) vacuum pump (C) accumulator (D) vacuum back-up booster
C
According to Pascal's law, the original pressure placed on a confined liquid is _____ throughout the liquid. (A) transferred with increased pressure (B) transferred with decreased pressure (C) transferred undiminished (D) transferred with an increase or decrease, depending on the shape of the container
C
All of the following statements regarding the fluid reservoir for a brake system's master cylinder is true, except: (A) has a vented cover for brake fluid expansion and contraction. (B) provides extra brake fluid to compensate for lining wear and minute leaks. (C) is attached to the bottom of the master cylinder in all vehicles. (D) is often manufactured with clear plastic.
C
The _____ valve closes off pressure to the front disc brakes until the hydraulic system pressure can overcome rear brake shoe retracting spring pressure. (A) proportioning (B) variable pressure (C) disc brake metering (D) master cylinder check
C
Which of the following valves warns the driver that one side of a split hydraulic system has failed? (A) Proportioning valve. (B) Master cylinder check valve. (C) Pressure differential switch. (D) Metering valve.
C
Which of the four stages of vacuum-suspended power booster operation occurs when both the vacuum and atmospheric port are closed and the near side of the diaphragm plate is subjected to a specific and unchanging amount of atmospheric pressure? (A) Released position. (B) Applied position. (C) Holding position. (D) Releasing after application position.
C
Metal brake lines and _____ are connected together at certain points on a vehicle and are securely held with brackets or clips. (A) steering system components (B) flexible, rubber coolant hoses (C) parking brake linkage (D) flexible, rubber brake hoses
D
Reducing engine power and operating the brake system to increase vehicle acceleration and stability on wet, icy, or uneven road surfaces is the task of a _____. (A) regenerative braking system (B) hydraulic power brake booster (C) tandem brake booster (D) traction control system (TCS)
D
Synthetic and steel fibers as well as iron, ceramic, and metallic powders are the materials currently used to manufacture _____. (A) brake hoses (B) wheel cylinder dust boots (C) the brake master cylinder fluid reservoir (D) the friction linings for brake pads and shoes
D
The web designed into a _____ creates a T-shaped cross-section that adds rigidity and exerts braking pressure over the full lining width and length when applied. (A) backing plate (B) wheel cylinder (C) brake drum (D) brake shoe
D
What does a "hill holder" feature do? (A) Lightly applies the vehicle brakes when traveling up an incline. (B) Prevents a vehicle from reaching excessive speeds when rolling down an incline. (C) Disengages any power assist from the system when braking on an incline. (D) Prevents a vehicle from rolling backward when stopped on an incline.
D
True or False? Anti-lock brake systems (ABS) allow the driver to maintain directional control while providing maximum braking efficiency by locking up the wheels during emergency braking.
False
True or False? Compared to a non-floating caliper, a floating disc brake caliper uses one "U-shaped" brake pad to contact both the inner and outer sides of the brake rotor.
False
True or False? The components and operation of a vacuum power brake booster are the same for both gasoline and diesel engines.
False
True or False? Trapped air within a brake hydraulic system causes the brake system to respond faster and apply with stronger force.
False
True or False? A hybrid vehicle's regenerative braking system takes the kinetic energy that would be turned into heat by the conventional braking system and turns it into electricity to recharge the vehicle's high- voltage battery.
True
True or False? An electronic stability control (ESC) system constantly monitors steering and vehicle direction, but operates only to correct a loss of steering control.
True
True or False? In a vacuum-suspended power booster, the booster has a vacuum on both sides of the diaphragm or piston when the booster is in the released position.
True
True or False? Unlike air, liquids confined under pressure cannot be compressed
True
