Automobile Engineering in ME
The problems caused by the wheel imbalance are

Steering wheel vibrations and uneven tyre wear
Hard steering and hard ride
Poor acceleration and reduced fuel efficiency
Poor acceleration and hard steering

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

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
Cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level

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