Allstar brake proportioning valve which reduces pressure to allow the adjustment of brake bias via the adjuster knob. It is adjustable within its range of zero to maximum 57% pressure reduction. The valve has 1/8 NPT inlet and outlet ports and is supplied complete with two 1/8 NPT male to 3/8 UNF inverted flare female adaptors. The valve body as two mounting holes suitable for 1/4" or M6 bolts on a spacing of 1" (25.4mm).