7290-158 Revision Exam questions

Potential hazard of working on a leaking hydraulic power steering system?

• Power steering oil is corrosive

• Fumes from oil are toxic

• System under pressure when engine running

• System under pressure when engine not running

Answer explanation

While engine is running the hydraulic pump supplies pressure through pipes. If pipe removed with engine running fluid will escape under high pressure.

What is the best method to determine a brake fluid leak?

• Remove wheels and visual check

• Apply brakes for 10 minutes then visual check

• Strip all brakes and examine them

• Ask assistant to apply brake, visual check

Answer explanation

The best way to determine if the fluid is leaking is to have a colleague apply brake, while you inspect lines with a torch.

What is best way to test SRS wiring harness when it has been removed from vehicle?

• Volt

• Test light

• Ohms

• Amps

Answer explanation

Once harness is removed there is no supply voltage, the only way to test it electronically is for continuity, using an Ohmmeter.

The brake roller test results shown in image, what is the technician's report?

• O/S brake binding

• O/S lack of effort

• N/S brake binding

• N/S lack of effort

Answer explanation

The reading on the nearside gauge is far too low, this would indicate that the n/s brake is not applying as much friction to discs as the o/s.

One method to test a faulty ABS sensor is to?

• Use live data on a scanner

• Spin wheel and listen for noise

• Check modulator valves

• Resistance check with a voltmeter

Answer explanation

Using an OBD with live data allows you to view information in either graph or data format. Spinning wheel and listening will only indicate parts rubbing, Modulator valves are an actuator, and you do not perform resistance check with a voltmeter!

With vehicle on a flat hard standing steering vehicle slowly left to right, what component is being tested?

• Rack and pinion

• Anti-roll bar

• Wheel bearings

• Steering lock

Answer explanation

With the vehicle weight being supported as when driving, rocking the steering wheel side to side will indicate any wear in track rods or inner rack joints.

A vehicle has a severely leaking wheel cylinder, which has contaminated the brake shoes, what is best repair?

• Renew all brake cylinders, and bleed brakes.

• Renew brake cylinder, set of brake shoes, bleed brakes.

• Clean brake shoes, replace faulty cylinder

• Adjust brakes all round

Answer explanation

Once brake shoes are contaminated they have to be replaced, this must be as an axle set. The worn cylinder must also be replaced, then bleed all air from system.

What is best way for checking toe out on turns?

• Use tape measure

• Tracking gauge

• Camber gauge

• Turntables

Answer explanation

To check toe out on turns the steering needs to be operated from lock to lock, at manufacturer's specified angle. The tool required is a protractor turntable.

What setting should meter be set for V ac?

• 1

• 2

• 3

• 4

Answer explanation

the first setting on this DMM is VAC wavy line or sine wave. Then VDC straight line with dotted line. third setting setting is Ohms.

Technician notes that vehicle ride height on a passive/non active suspension is low on N/S/F, what is likely cause?

• Seized ride height senso

• Broken coil spring

  
  

• Worn rear dampers

• Wheel alignment

Answer explanation

The weight of a vehicle is suspended by springs, so a broken spring is likely to lower the height.