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 front brakes than on the rear 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 rear brakes than on the front 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
When the front wheels of a vehicle are locked during braking, then

Front tyres skid across the road surface, and the vehicle spins around
Driver loses control over the steering, and the vehicle continues moving in its current direction
Rear tyres skid across the road surface, and the vehicle spins around
Stopping distance becomes extremely long

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Automobile Engineering in ME
The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

Enable the pump's fault diagnosis function to operate
Pressurise the fuel system before the engine is started
Supplies a large amount of fuel and thereby creates a choke effect
Warm up and lubricate the pump

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