Chapter 1 Flashcards
______________ braking systems use electrical generators to help slow the vehicle during gradual stops and help recharge the electric batteries.
REGENERATIVE
The _______________ _______________ is mounted on a lever with a pivot near the top of the lever.
BRAKE PEDAL
Modern automotive _______________ _______________were developed from aircraft brakes of World War II.
BRAKE PADS
Disc _______________ _______________ are mounted in a caliper that sits above the spinning rotor.
BRAKE PADS
The _______________ _______________ is the start of the brake hydraulic system.
MASTER CYLINDER
All master cylinders for vehicles built since 1967 have _______________ _______________ and pumping chambers
2 PISTONS
There are two types of split systems: _______________ and front/rear.
DIAGONAL
The electronic function of the proportioning valve has been called “_______________ _______________ _______________” and “_______________ _______________ _______________” by various manufacturers
“DYNAMIC REAR PROPORTIONING”
“ELECTRONIC BRAKE DISTRIBUTION”
Most systems with drum brakes have a single, _______________ cylinder at each wheel.
TWO-PISTON
The ABS does the same thing as an _______________ _______________ would, only it does it faster and more precisely.
EXPERIENCED DRIVER
Technician A says all the friction components of a disc brake are exposed to the airstream. Technician B says this helps to cool the brake parts and maintain braking effectiveness during repeated hard stops from high speeds. Who is correct?
A. A only C. Both
B. B only D. Neither
BOTH
Technician A says that with a fixed caliper, hydraulic pressure is applied to pistons on both sides to force the pads against the rotor. Technician B says that with a movable caliper, pressure is applied to a piston on the outboard side only. Who is correct?
A. A only B. B only
C. Both
D. Neither
A ONLY
Technician A says drum brakes do not develop the mechanical servo action that you will learn about as you study drum brakes. Technician B says drum brakes require higher hydraulic pressure and greater force to achieve the same stopping power as a comparable disc brake. Who is correct?
D NEITHER
While discussing the brake stroke sensor, Technician A says the brake stroke sensor informs the brake controller how fast the brake pedal is being pushed down. Technician B says the stroke sensor also informs the controller how much pressure the driver is applying to the brakes.
C BOTH
Technician A says the stroke simulator is used to make hybrid brake application feel normal to the driver. Technician B says the stroke simulator is an electrical switch for the brake lamps. Who is correct?
A ONLY
Technician A says that all new vehicles have metering and proportioning valves. Technician B says that the function of these valves has been taken over by the ABS system on most vehicles. Who is correct?
B ONLY
While discussing wheel cylinders and caliper pistons, Technician A says wheel cylinders of drum brakes operate in response to the master cylinder. Technician B says the caliper pistons of disc brakes operate in response to the wheel cyl- inders. Who is correct?
A ONLY
Technician A says almost all brake systems have a power booster that increases the force of the driver’s foot on the pedal. Technician B says most cars and light trucks use a vacuum booster that uses the combined effects of engine vacuum and atmospheric pressure to increase pedal force.
C. BOTH
Technician A says some vehicles without a ready vacuum source may have a hydraulic power booster. Technician B says the hydraulic booster can be supplied with fluid by the power steering system or may be a part of the brake system and driven by an electric motor. Who is correct?
C BOTH
Technician A says automatic ride control (ARC) is an electronic braking system designed to provide a more comfortable ride. Technician B says ARC also allows betters control of the vehicle during cornering. Who is correct?
C BOTH
Name the four basic functions of the braking system
- Slow car
- stop car
- keep car in place
- allows directional control during max braking
Breifly describe the modern master cylinder
Reservoir, piston, fluid springs. Takes movement from the brake pedal with the lever and push fluid creating increasing hyraulic pressure using pascals law
Briefly describe why the split system is needed on modern vehicles
Creates stability in case of failure. If one line fails you still have stopping cabability during braking
Desribe the purpose of the brake stroke sensor on a hybrid vehicle
Tell the brake actuator how fast and how far the driver applie the brake pedal
Describe regenerative breaking
Takes kinetic energy from the wheels to turn an electric generator to recharge batteries
Describe the lines and hoses used on vehicle braking systems
Double sealed, flexible to accomodate motion, coated to protect from corrosion double walled and seamless
Why is it wrong to call the parking brake an emergency brake
Should only be used to keep the car stopped as opposed to a service brake
Describe waht is meant by negative wheel slip.
When bakes are applied with enough pressure and stop the wheels from rotating. Called lock up
Explain how the traction control system works to control wheel spin
Controls positive wheel spin - can reduce engine power via throttle control, reduce engine timing through ecm and apply brakes to the spinning wheel
- Describe the two types of split hydraulic systems.
Diagonal, Front to back
