Vehicle Systems Quiz

In a multiplexed vehicle wiring system:

• a data bus carries signals to and from remote control units

• each unit uses a separate relay

• the supply voltage is very high

• more wire is required than conventional systems

Under heavy braking juddering is felt through the vehicle. The most likely cause of brake judder would be:

• excessive disc run-out

• wheel balance

• seized caliper piston

• badly worn brake linings

In relation to the legal requirements affecting companies, what is the meaning of the abbreviation 'EPA'?

• Extreme Pressure Act

• Environmental Pressure Act

• Environmental Protection Act

• Employees Protection Act

On a road test, a vehicle pulls to the left-hand side from the straight-ahead position. One possible cause is:

• incorrect nearside tyre pressures

• worn offside front damper

• worn off side wheel bearing

• offside front brake binding

If the ABS system is disabled, one possible effect of this would be:

• brakes will bind on release

• traction control is unaffected

• electro-hydraulic modulator valve will still function normally

• electro-hydraulic modulator valve is disabled

Steering wheel free play can be caused by:

• inoperative EPAS system

• worn track rod ends

• incorrect tyre combinations

• incorrect wheel alignment

Excessive vehicle dive is caused by:

• worn rear suspension dampers

• worn front suspension dampers

• worn swivel pins

• defective ABS ECU

A vehicle has excessive front wheel tyre wear. One cause of this is:

• incorrect rear wheel camber

• four wheel steering is fitted

• incorrect steering geometry

• steering torque sensor is inoperative

At high speed the steering system suffers from a vibration. The wheels have been checked for correct balance. One possible cause is:

• worn dampers

• seized track rod

• all answers shown

• incorrect tyre pressures

If the braking system suffers brake fade this will:

• give longer stopping distance

• have excessive pedal travel

• give brake judder

• reduce the fluid level