4290-158 ABS

The following basic vehicle, physics concepts, are important when explaining how the ABS (anti-lock brake system) operates, braking distance, force, tyre slip, coefficient of friction & Kamm circle.

• True

• False

The braking force is then transmitted to the road surface by means of the

• Driver and Brake

• Brake and Chassis

• Wheels and Tyres

• Transmission and Tyres

The circumferential speed of a free rolling wheel is equal to the vehicle speed.

• True

• False

The coefficient of friction is dependent on two forces, what are these forces?

• road material and tyre type

• Longitude and latitude

• Literal and lateral

• vertical and frictional

What is the optimum coefficient for a modern tyre?

• 10 - 30%

• 0-100%

• above 50%

• 100%

Kamm circle describes what?

• When a car turns lock to lock

• The rolling diameter of the wheels

• the longitudinal and lateral forces

• The valve opening on the engine

What item does not contribute to Braking Distance?

• Coefficient of Friction

• Brake force

• Thinking time

• Tyre slip

What is tyre slip?

• an indication of the quality of a tyre

• always the same for all four wheels of a passenger vehicle.

• marks the relationship between the speed of the tyre and the road speed of a vehicle.

• cannot be influenced by the driver.

The maximum frictional force that a tyre can transmit to the road surface during full braking is NOT dependent on?

• the road surface material

• the force exerted by the driver on the brake pedal

• The tyre material

• the prevailing type of friction

What components are typically added to a standard braking system for ABS?

• Wheel speed sensors, ECU, Hydraulic valve unit

• Disc brakes, EPB, and ESP

• TCS, EBD, Vented discs

• Engine sensor, ECU and Additional master cylinder