Automobile Engineering in ME
The function of anti-lock brake system (ABS) is that is

Prevents nose dives during braking and thereby postpones locking of the wheels
Minimizes the brake fade
Reduces the stopping distance
Maintains directional control during braking by preventing the wheels from locking

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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
Reduce the brake fluid pressure when the brakes approach their lockup point
Cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level
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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