Automobile Engineering in ME
The function of a proportioning control valve (PCV) in a brake system is to

Cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level
Ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation
Cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level
Reduce the brake fluid pressure when the brakes approach their lockup point

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Automobile Engineering in ME
The basic function of the suspension is to

Absorbs vibration and impact forces from the road surface
Automatically correct the effects of over steering
Ensure that wheel alignment is not disturbed during driving
Ensure that the steering wheel can deliver a suitable amount of steering force

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Automobile Engineering in ME
It is necessary to maintain the valve clearances as they

Increase the speed at which the valves move up and down
Reduce the resistance to sliding that occurs between the cam and the tappet
Allow for lengthening of the valves owing to the heat of combustion
Make the crankshaft turn smoothly

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