My cortina has regular ford m16 calipers at the front and mk3 escort discs at the Rear, has a single circuit 0.7mm master cyl. Ive bled it many times and am certain there's no air. Still I have a poor pedal and little stopping power. If I clamp off the rears I get a good pedal and pretty good(front only) brakes.
I can't understand what's happening, would fitting a proportioning valve or a 2lb residual pressure valve help or do I need a bigger master?