Proflow Billet Aluminium Brake Proportioning Valve, Knob Adjustment, 3/8;;-24, Single Inlet/Outlet, Each

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.