chapter 5

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reapply

(BPMV stage) opens inlet valve

dump

(BPMV stage) opens outlet valve

isolation

(BPMV) first stage of operation

f

T/F The power-up self-test occurs once the vehicle is shifted into drive or reverse.

a

Technician A says that the booster pump and accumulator take the place of a power booster in an integral system. Technician B says that a non-integral system can reach pressures of up to 2700 psi. Which technician is correct?

four-channel ABS

The control module of a ________ handles all four wheels separately.

prevent wheel lock-up

The function of an ABS system is to _______.

high pressure accumulator

The pressure sensor continuously reads ________ ___________ ___________ pressure.

EBCM

The solenoid valve block is part of the ______.

the pressure sensor tells the EBCM to turn it on so it can stabilize pressure

What tells the pump to turn on ?

isolation

contains one supply valve for each driven wheel(ONE OF THESE NOT RIGHT)

booster pump

converts mechanical force to hydraulic pressure

power up self test

what applies power to the ABS pump and relays when the ignition is engaged?

dual stage solenoid valve

what combines a isolation and a dump valve?(ONE OF THESE NOT RIGHT)

electronic brake control module

what monitors brake system by receiving and sending information from and to related components and systems ?

the solenoid block

what part of the braking system is attached to a circuit board and houses many solenoids?

eccentric pump

what rotates, causing the pump elements to move in and out?

EBCM

what's monitoring the pump that is holding pressure inside the accumulator ?

electronic control module

where does input from various vehicle sensors such as the wheel speed sensor go ?

The EBCM talks to the PCM because it needs to know that the car is running so the ABS will be active. This "varying voltage" would come from the engine turning over but not starting ch ch ch ch ch ch

where would varying electrical voltage come from that would not allow the ABS system to work

pump pressure switch

which sensor monitors pressure in the accumulator? in this the EBCM will signal the pump to restore pressure.

one channel is just for the rear wheels and the ABS helps control both during slippage

which wheels would a one channel ABS braking apply

So it can provide power to the rest of the ABS, motor and solenoid valves

why would the EBCM signal the relay (relay switch) to close?

output

The ABS warning light belongs in which category? input or output

electronic brake control module

The Bosch 8.0 uses the _______ __________ _________ as the communication and monitoring system.

traction control system

allows the pressure from the wheel brake to dissipate back to the accumulator(ONE OF THESE NOT RIGHT)

solenoid block

provides the electromagnetic signal to engage each of the valves individually in this assembly

pump motor

provides the mechanical force to create hydraulic pressure

dump

returns valves to normal position, allowing hydraulic pressure to flow freely throughout the system (ONE OF THESE NOT RIGHT)

electromagnetic

solenoids operate using what type of force?

reapply

stage of operation that cuts off the pressure to the wheel brake(ONE OF THESE NOT RIGHT)

reapply

(BPMV stage) allows pressure to flow to hydraulic circuit

dump

(BPMV stage) directs pressure to accumulators

isolation

(BPMV stage) maintains pressure existing in hydraulic circuit

a four channel system

A fully independent suspension system would be installed on a vehicle with which type of ABS channel system?

REAR

Dual-stage solenoid valves are typically found on ______-wheel drive vehicles.

three

Front wheel drive and rear wheel drive might have a _________ channel ABS system

The high pressure uses a nitrogen charge. and the low pressure one contains a sealed piston

How does the low pressure and high pressure accumulator work?

The control module selects the lowest wheel speed to determine brake fluid pressure

How would a three channel brake system determine how to distribute brake fluid pressure?

solenoids

In an ABS system, the _______ rapidly open and close hydraulic valves.

three-channel ABS

On a front wheel drive vehicle, the control module of a ________ handles front wheels separately and the rear wheels as a pair.

one-channel ABS

On rear-wheel drive vehicles with a ________ system, the front wheels do not require speed sensors.

T

T/F A 3-channel ABS combines the two rear wheels under one valve set control.

T

T/F Accumulator high pressure is around 2700 psi.

F

T/F Accumulators store vacuum.

T

T/F In a low pressure system, the DC motor turns a shaft with an eccentric cam that forces pistons to pump fluid.

T

T/F Inlet valves remain open during normal operating conditions

T

T/F The Bosch 8.0 system integrates ABS, stability and traction control, and brake assist.

T

T/F The Bosch 8.0 system provides dynamic rear brake proportioning.

F

T/F The EBCM only communicates with vehicle sensors for its inputs.

F

T/F The brake modulator valve cuts off hydraulic pressure to the wheels for the duration of an ABS event.

T

T/F The electronic brake control module is considered the brain of the system.

T

T/F The motor turns on and off when it receives direction from the EBCM

F

T/F VSES and TCS use only the inlet and outlet valves in a 4-channel ABS.

b

Technician A says that the PCM provides the direction to all of the ABS outputs. Technician B says on modern vehicles the EBCM communicates with other modules and provides diagnostic information to the scan tool. Which technician is correct?

without driver control

The ABS pump creates hydraulic pressure ___________

PCM and TCM (transmission control module)

The EBCM is going to communicate with the ___ and the ___ to initialize and monitor ABS, TCS (traction) and VSES (stability)

ABS indicator

The ________ ______________ is on when a fault is detected in the system.

control module

The ________ may be called EBCM or CAB.

keep alive

The _________ _________ pump runs continuously when the ABS is functioning

The brake assist system

The _____________ _______ ____________ uses the ECBM and the vacuum power booster to increase braking force

input

The brake fluid sensor belongs in which category? input or output info?

input

The engine crank sensor belongs in which category? input or output?

yaw sensor

The lateral vehicle sway on turns is measured by the _______.

One Channel, three channel, and four channel.

The type of ABS

False

Traction control systems work best in deep snow and mud.

one channel ABS system

Type of ABS channel that control braking on rear wheels and has the wheel speed sensor on the transmission of differential Called RWAL by GM and RABS by ford

electronic brake control module

What component sends the command to the pump motor to turn on and off to create hydraulic pressure?

Fluid flows from master cylinder to the inlet valves then to the brakes. This valve control pressure to specific wheels. These valves can restrict lines if needed

What do the inlet valves do ?

The type of ABS system

What do the number of outlet valves depend on ?

Bleeds pressure from specific wheels when open so it equalize the system

What do the outlet valves do?

electronic brake control module

What does EBCM stand for ?

The type of ABS system

What does the number of inlet valves depend on ?

EBCM

What is going to monitor proper relay function and also reports its findings to other modules to ensure smooth sailing. like a short or open.

You'd find that on an older model car that's rear wheel drive ABS vehicles. It is a single solenoid that control both isolation and dump valves

When would you find a dual stage solenoid valve and what is that ?

exist really only for TCS and VSES features (Traction control and Vehicle stability). The number of valves depends on number of driven wheels. The position of the supply valves is usually closed but opens during traction control or stability type event to allow fluid into the pump

When would you find supply valves and what would the number of supply valves depend on ?

low pressure accumulator

Where does residual hydraulic pressure go when it is released from the wheel brake in a non-integral system?

accumulator

Which component of the brake pressure modulator valve stores pressurized hydraulic fluid?

isolation

Which valves in the brake pressure modulator valve are only used with the traction control system?

The outlet and supply valves ( the middle two) are normally closed until acted upon, and the inlet and isolation valves are usually open.

Which valves in the valve solenoid block are usually open and which ones are usually closed?

Exists for TCS and VSES as well. And the number of valves depends on the number of driven wheels. The position is usually in the open position and closes to maintain and build pressure in the pump.

Why do Isolation valves exist? What does the number of valves depend on?

for non integral system it would turn the pump on to make sure that enough fluid is pumped back into master cylinder. For integral system it would turn on the pump to ensure proper pressure in the accumulator.

Why would the EBCM tell the pump to turn on? why for integral system and why for non integral system ?

4-channel ABS

contains one inlet and outlet valve for each driven wheel(ONE OF THESE NOT RIGHT)

The EBCM will tell the PCM to retard the engine timing and reduce fuel injector pulse width.

during a TCS (traction control) even the EBCM will talk to the PCM why?

the EBCM figures out what needs to be opened or closed and then sends an electrical current to the coil which engages the solenoid.

how is solenoid open or closed?

four wheel speed sensors

how many wheel speed sensors does a front wheel drive vehicle have with a three channel ABS system?

the outlet valve will open

in a non integral system where does pressure come from to get to the accumulators?

A dual stage solenoid valve

in this valve you could have isolation, dump and reapply stages. (ONE OF THESE NOT RIGHT)

brake assist system

provides greater vacuum to the power booster to increase braking force

plunger pump

provides hydraulic pressure to one side of the vehicle or the other

electromagnetic device that moves a valve

provides the electromagnetic charge to move a valve(ONE OF THESE NOT RIGHT)

dual-stage solenoid valve

uses one solenoid to control both the isolation and dump valve(ONE OF THESE NOT RIGHT)

plunger pumps

what are the things that go on each side of the valve block? They send pressure to the pair of wheels associated with its side of the pump

traction control switch

what disables system on driver command for driving in deep snow or mud?

Brake pressure modulator valve

what does BPMV stand for

vehicle stability enhancement

what helps maintain vehicle contact with the road during understeer or oversteer conditions?

ABS indicator

what is an icon on the dashboard that stays illuminated when a fault is present?

EBCM

what is constantly monitoring the wheel speed sensor to detect problems or slippage? ... it's the only thing always monitoring the wheels speed sensor

the valve that the fluid flows through to get to the brakes

what is the dump valve?

it creates the hydraulic pressure for the ABS system. It's in between two pistons in the booster pump.

what is the eccentric cam?


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