Hi all, as you can tell from my recent posts, I am at the pedals stage! I only have the fuel tank and battery at the front of the car and am using Cortina callipers (54mm bore). At the rear I have Fiesta discs/rover callipers (30mm bore). Will a pressure reducer be needed to stop the back locking first? My instinct says 'No' -what have you all found?

Cheers

JC

No reducer will be needed with such small bore calipers on the rear.

Thanks! I've just discovered a brake math(s) excel spreadsheet that seems to indicate this! It has certainly given me lots of numbers to think about!!!!!!

Ideal brake effort split front rear for a midi is about 55 to 60% on the front hence by implication 45% to 40% on the rear.

You have exactly 75% of the effort on the front 25% on the rear. The fronts will lock prematurely.

Thanks - some meaning to the numbers and some targets! A switch to Sierra rear calipers (42.8mm) or Golf would appear to correct the balance - should still be no need for compensators/reducers. That just leaves the master cylinders to sort.........

If you use a Sierra master cylinder then you will not need to worry as it produces less pressure at the back than the front.

That is a solution - at the moment it would now appear that I actually have the opposite problem to what I originally thought i.e. not enough braking at the rear!!!!!!! Any idea of the respective diameters of the Sierra cylinders? Could I plumb it in reverse ie back to the front?

Thanks again!

JC