Proflow brake proportioning valves are adjustable between 100 and 1000 PSI (depending on model) with a twist of a knob or the flip of a lever, and most can reduce pressure up to 57%. They let you adjust brake bias quickly and easily to compensate for changing track conditions, or for big and little tyre combinations.

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Proflow Proportioning Valve Bracket, Steel, Zinc Master Cylinder Mount, Frame Mount, Universal, Each

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