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Proportioning valves are generally between the master cylinder & the corridor of your brake lines.. designed to intercept & proportion.. fluid pressure best for what is on the front or rear of a cars braking system.
Its an engineered part when set up by the car manufacturers.
There is a number of "adjustable" proportioning valves too listed here.. that may help on factory co-ordination of front and rear to prevent lock up etc.
Consult a brake expert.
Make sure you use a PVtool shown here when bleeding a New factory replacement PV.. its not the same as local cars..
you will stuff if up if you don't do it right the VERY FIRST TIME.....its not a toy.. do it right.
