Podcast
Questions and Answers
The _____________ _______ ____________ uses the ECBM and the vacuum power booster to increase braking force.
The _____________ _______ ____________ uses the ECBM and the vacuum power booster to increase braking force.
brake assist system
The ________ ______________ is on when a fault is detected in the system.
The ________ ______________ is on when a fault is detected in the system.
ABS indicator
The Bosch 8.0 uses the _______ __________ _________ as the communication and monitoring system.
The Bosch 8.0 uses the _______ __________ _________ as the communication and monitoring system.
electronic brake control module
Traction control systems work best in deep snow and mud.
Traction control systems work best in deep snow and mud.
What helps maintain vehicle contact with the road during understeer or oversteer conditions?
What helps maintain vehicle contact with the road during understeer or oversteer conditions?
What disables the system on driver command for driving in deep snow or mud?
What disables the system on driver command for driving in deep snow or mud?
What is an icon on the dashboard that stays illuminated when a fault is present?
What is an icon on the dashboard that stays illuminated when a fault is present?
Provides greater vacuum to the power booster to increase braking force.
Provides greater vacuum to the power booster to increase braking force.
What applies power to the ABS pump and relays when the ignition is engaged?
What applies power to the ABS pump and relays when the ignition is engaged?
What monitors the brake system by receiving and sending information from and to related components and systems?
What monitors the brake system by receiving and sending information from and to related components and systems?
The electronic brake control module is considered the brain of the system.
The electronic brake control module is considered the brain of the system.
The power-up self-test occurs once the vehicle is shifted into drive or reverse.
The power-up self-test occurs once the vehicle is shifted into drive or reverse.
The Bosch 8.0 system integrates ABS, stability and traction control, and brake assist.
The Bosch 8.0 system integrates ABS, stability and traction control, and brake assist.
The Bosch 8.0 system provides dynamic rear brake proportioning.
The Bosch 8.0 system provides dynamic rear brake proportioning.
The brake modulator valve cuts off hydraulic pressure to the wheels for the duration of an ABS event.
The brake modulator valve cuts off hydraulic pressure to the wheels for the duration of an ABS event.
The motor turns on and off when it receives direction from the EBCM.
The motor turns on and off when it receives direction from the EBCM.
Inlet valves remain open during normal operating conditions.
Inlet valves remain open during normal operating conditions.
(BPMV) first stage of operation.
(BPMV) first stage of operation.
What does BPMV stand for?
What does BPMV stand for?
(BPMV stage) directs pressure to accumulators.
(BPMV stage) directs pressure to accumulators.
(BPMV stage) allows pressure to flow to hydraulic circuit.
(BPMV stage) allows pressure to flow to hydraulic circuit.
(BPMV stage) maintains pressure existing in hydraulic circuit.
(BPMV stage) maintains pressure existing in hydraulic circuit.
(BPMV stage) opens outlet valve.
(BPMV stage) opens outlet valve.
(BPMV stage) opens inlet valve.
(BPMV stage) opens inlet valve.
Which valves in the brake pressure modulator valve are only used with the traction control system?
Which valves in the brake pressure modulator valve are only used with the traction control system?
What component sends the command to the pump motor to turn on and off to create hydraulic pressure?
What component sends the command to the pump motor to turn on and off to create hydraulic pressure?
Which component of the brake pressure modulator valve stores pressurized hydraulic fluid?
Which component of the brake pressure modulator valve stores pressurized hydraulic fluid?
Type of ABS channel that controls braking on rear wheels and has the wheel speed sensor on the transmission of differential. Called RWAL by GM and RABS by Ford.
Type of ABS channel that controls braking on rear wheels and has the wheel speed sensor on the transmission of differential. Called RWAL by GM and RABS by Ford.
What are the types of ABS?
What are the types of ABS?
Which wheels would a one channel ABS braking apply?
Which wheels would a one channel ABS braking apply?
Front wheel drive and rear wheel drive might have a _________ channel ABS system.
Front wheel drive and rear wheel drive might have a _________ channel ABS system.
How would a three channel brake system determine how to distribute brake fluid pressure?
How would a three channel brake system determine how to distribute brake fluid pressure?
Where does input from various vehicle sensors such as the wheel speed sensor go?
Where does input from various vehicle sensors such as the wheel speed sensor go?
How many wheel speed sensors does a front wheel drive vehicle have with a three channel ABS system?
How many wheel speed sensors does a front wheel drive vehicle have with a three channel ABS system?
A fully independent suspension system would be installed on a vehicle with which type of ABS channel system?
A fully independent suspension system would be installed on a vehicle with which type of ABS channel system?
The function of an ABS system is to _______.
The function of an ABS system is to _______.
In an ABS system, the _______ rapidly open and close hydraulic valves.
In an ABS system, the _______ rapidly open and close hydraulic valves.
On rear-wheel drive vehicles with a ________ system, the front wheels do not require speed sensors.
On rear-wheel drive vehicles with a ________ system, the front wheels do not require speed sensors.
On a front wheel drive vehicle, the control module of a ________ handles front wheels separately and the rear wheels as a pair.
On a front wheel drive vehicle, the control module of a ________ handles front wheels separately and the rear wheels as a pair.
The control module of a ________ handles all four wheels separately.
The control module of a ________ handles all four wheels separately.
The lateral vehicle sway on turns is measured by the _______.
The lateral vehicle sway on turns is measured by the _______.
The ________ may be called EBCM or CAB.
The ________ may be called EBCM or CAB.
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.
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.
What part of the braking system is attached to a circuit board and houses many solenoids?
What part of the braking system is attached to a circuit board and houses many solenoids?
Which sensor monitors pressure in the accumulator? In this, the EBCM will signal the pump to restore pressure.
Which sensor monitors pressure in the accumulator? In this, the EBCM will signal the pump to restore pressure.
How does the low pressure and high pressure accumulator work?
How does the low pressure and high pressure accumulator work?
What tells the pump to turn on?
What tells the pump to turn on?
What provides hydraulic pressure to one side of the vehicle or the other?
What provides hydraulic pressure to one side of the vehicle or the other?
What provides the electromagnetic signal to engage each of the valves individually in this assembly?
What provides the electromagnetic signal to engage each of the valves individually in this assembly?
What provides the mechanical force to create hydraulic pressure?
What provides the mechanical force to create hydraulic pressure?
Accumulator high pressure is around 2700 psi.
Accumulator high pressure is around 2700 psi.
The EBCM only communicates with vehicle sensors for its inputs.
The EBCM only communicates with vehicle sensors for its inputs.
Accumulators store vacuum.
Accumulators store vacuum.
VSES and TCS use only the inlet and outlet valves in a 4-channel ABS.
VSES and TCS use only the inlet and outlet valves in a 4-channel ABS.
In a low pressure system, the DC motor turns a shaft with an eccentric cam that forces pistons to pump fluid.
In a low pressure system, the DC motor turns a shaft with an eccentric cam that forces pistons to pump fluid.
A 3-channel ABS combines the two rear wheels under one valve set control.
A 3-channel ABS combines the two rear wheels under one valve set control.
The pressure sensor continuously reads ________ ___________ ___________ pressure.
The pressure sensor continuously reads ________ ___________ ___________ pressure.
The ABS pump creates hydraulic pressure __________.
The ABS pump creates hydraulic pressure __________.
Which valves in the valve solenoid block are usually open and which ones are usually closed?
Which valves in the valve solenoid block are usually open and which ones are usually closed?
What does the number of inlet valves depend on?
What does the number of inlet valves depend on?
What do the inlet valves do?
What do the inlet valves do?
What does the number of outlet valves depend on?
What does the number of outlet valves depend on?
What do the outlet valves do?
What do the outlet valves do?
When would you find supply valves and what would the number of supply valves depend on?
When would you find supply valves and what would the number of supply valves depend on?
Why do isolation valves exist? What does the number of valves depend on?
Why do isolation valves exist? What does the number of valves depend on?
Solenoids operate using what type of force?
Solenoids operate using what type of force?
When would you find a dual stage solenoid valve and what is that?
When would you find a dual stage solenoid valve and what is that?
What is the dump valve?
What is the dump valve?
What combines an isolation and a dump valve?
What combines an isolation and a dump valve?
In this valve, you could have isolation, dump and reapply stages.
In this valve, you could have isolation, dump and reapply stages.
Contains one supply valve for each driven wheel.
Contains one supply valve for each driven wheel.
Contains one inlet and outlet valve for each driven wheel.
Contains one inlet and outlet valve for each driven wheel.
Uses one solenoid to control both the isolation and dump valve.
Uses one solenoid to control both the isolation and dump valve.
Provides the electromagnetic charge to move a valve.
Provides the electromagnetic charge to move a valve.
Stage of operation that cuts off the pressure to the wheel brake.
Stage of operation that cuts off the pressure to the wheel brake.
Allows the pressure from the wheel brake to dissipate back to the accumulator.
Allows the pressure from the wheel brake to dissipate back to the accumulator.
Returns valves to normal position, allowing hydraulic pressure to flow freely throughout the system.
Returns valves to normal position, allowing hydraulic pressure to flow freely throughout the system.
The solenoid valve block is part of the ______.
The solenoid valve block is part of the ______.
Dual-stage solenoid valves are typically found on ______-wheel drive vehicles.
Dual-stage solenoid valves are typically found on ______-wheel drive vehicles.
In a non-integral system, where does pressure come from to get to the accumulators?
In a non-integral system, where does pressure come from to get to the accumulators?
Where does residual hydraulic pressure go when it is released from the wheel brake in a non-integral system?
Where does residual hydraulic pressure go when it is released from the wheel brake in a non-integral system?
What is the eccentric cam?
What is the eccentric cam?
What rotates, causing the pump elements to move in and out?
What rotates, causing the pump elements to move in and out?
What converts mechanical force to hydraulic pressure?
What converts mechanical force to hydraulic pressure?
Which technician is correct? 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? 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.
What is constantly monitoring the wheel speed sensor to detect problems or slippage?
What is constantly monitoring the wheel speed sensor to detect problems or slippage?
Where would varying electrical voltage come from that would not allow the ABS system to work?
Where would varying electrical voltage come from that would not allow the ABS system to work?
What is monitoring the pump that is holding pressure inside the accumulator?
What is monitoring the pump that is holding pressure inside the accumulator?
What is going to monitor proper relay function and also reports its findings to other modules?
What is going to monitor proper relay function and also reports its findings to other modules?
The EBCM is going to communicate with the ___ and the ___ to initialize and monitor ABS, TCS (traction) and VSES (stability).
The EBCM is going to communicate with the ___ and the ___ to initialize and monitor ABS, TCS (traction) and VSES (stability).
How is solenoid open or closed?
How is solenoid open or closed?
During a TCS (traction control) event, the EBCM will talk to the PCM why?
During a TCS (traction control) event, the EBCM will talk to the PCM why?
Why would the EBCM signal the relay (relay switch) to close?
Why would the EBCM signal the relay (relay switch) to close?
For a non-integral system, it would turn the pump on to make sure that enough fluid is pumped back into the master cylinder. For an integral system, it would turn on the pump to ensure proper pressure in the accumulator.
For a non-integral system, it would turn the pump on to make sure that enough fluid is pumped back into the master cylinder. For an integral system, it would turn on the pump to ensure proper pressure in the accumulator.
The _________ _________ pump runs continuously when the ABS is functioning.
The _________ _________ pump runs continuously when the ABS is functioning.
Which technician is correct? 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? 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.
The brake fluid sensor belongs in which category? Input or output info?
The brake fluid sensor belongs in which category? Input or output info?
The engine crank sensor belongs in which category? Input or output?
The engine crank sensor belongs in which category? Input or output?
The ABS warning light belongs in which category? Input or output?
The ABS warning light belongs in which category? Input or output?
Study Notes
Brake Systems Overview
- Brake Assist System: Utilizes the Electronic Control Brake Module (ECBM) and vacuum power booster to enhance braking force.
- ABS Indicator: Illuminates on the dashboard when there is a fault detected in the ABS system.
- Electronic Brake Control Module (EBCM): Central communication hub in Bosch 8.0 ABS systems, monitoring brake system components and functionality.
- Traction Control System (TCS): Functions less effectively in deep snow and mud, contrary to common belief.
- Vehicle Stability Enhancement System (VSES): Maintains vehicle contact with the road under conditions of understeer or oversteer.
ABS Functionality and Components
- Power-Up Self Test: Engages ABS pump and relays upon ignition, ensuring system readiness.
- Brake Pressure Modulator Valve (BPMV): Manages hydraulic pressure during ABS events with stages including isolation, dump, and reapply.
- Accumulator: Stores pressurized hydraulic fluid in the braking system, with high-pressure accumulator readings around 2700 psi.
Types of ABS Systems
- One Channel ABS: Controls braking on rear wheels, utilizing wheel speed sensor on the transmission/differential (known as RWAL by GM, RABS by Ford).
- Three Channel ABS: Common in front-wheel and rear-wheel drive vehicles, distributes brake fluid pressure based on the lowest wheel speed.
- Four Channel ABS: Features independent control of each wheel, often found in fully independent suspension systems.
Valve Operation and Structure
- Solenoids: Rapidly open and close hydraulic valves, crucial for ABS operations; electromagnetically operated.
- Inlet and Outlet Valves: Typically found in the valve assembly; inlet opens during fluid intake to brakes while outlet bleeds pressure from specific wheels.
- Dual-Stage Solenoid Valve: Integrates isolation and dump functions within a single solenoid, often used in rear-wheel drive ABS systems.
EBCM and System Communication
- EBCM: Acts as the brain of the ABS, monitoring wheel speed sensors for slippage and communicating with the Powertrain Control Module (PCM) and Transmission Control Module (TCM) for system coordination.
- Relay Switch: Used by the EBCM to turn the pump on or off, maintaining proper hydraulic pressure in various system configurations.
Important Notes on Operation
- Prevent Wheel Lock-Up: Key function of ABS systems, ensuring continuous traction during braking.
- Pressure Management: EBCM regulates hydraulic pressure, with the pump creating this pressure without direct driver input.
- Keep Alive Pump: Operates continuously during ABS functionality, assisting in maintaining hydraulic pressure.
Diagnostic and Control Functions
- Diagnostic Communication: EBCM provides crucial diagnostic information to scan tools, enhancing vehicle maintenance and troubleshooting.
- Input/Output Categories: Brake fluid and engine crank sensors are classified as input components, while the ABS warning light serves as an output indicator.
These notes encompass the critical aspects of braking systems, particularly focusing on ABS functionality, components, and operations for effective understanding and application.
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Test your knowledge on key terms from Automotive Systems Chapter 5. This quiz features flashcards that define crucial concepts such as brake assist systems and the electronic brake control module. Perfect for students looking to reinforce their understanding of automotive technology.
