I installed a Master Power Brakes front disk kit on my 72 Duster and I am having disproblems getting the brake light to keep from coming on from resonable braking. The brake failure light comes on everytime the brakes are pressed. We have bled these brakes a million times and can't get the light to stop coming on. Here is some background: the master cylinder they shipped with the kit leaked, so got a rebuilt one for a 73. The piston size from the kit is a 1" the replacement one is a 1-1/32" the original drums in the rear were 9" and the 8-3/4 rear end on there now has 11x2.5's with 15/16" wheel cylinders were the originals were 13/16". Is it possible the mismatch is causing the problem and is there a solution?

bwhitejr

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'72 Duster (Performance 360)
'83 Ramcharger (Performance 318)
'80 TrailDuster (360)
'80 D-150 Truck (See Below)
CompCams 252S, Holley 390cfm, Offy manifold
Ported, Polished and Gasket Matched
P4286813 Springs,0.040 Overbore,
0.090 Shaved Head