Soft brake pedal

[evilC]

Hi jakriz,

Those front calipers are way too big for the rears. You will need to up the size on the rear quite considerably to balance it out. The fronts are 4x larger than the rears but for a bug they ought to be about the same. What discs have you got on the rear - Porsche 944? If that is the case then I would swap in a set of 928S4 calipers that will balance out much better.
At the moment I think you are running out of stroke on the rear circuit before the fronts have come into play properly giving that spongey pedal feel. Even with the 944 stepped m/c (24/19) that only provides a 160% upgrade to the front if you use the 24mm bore whereas you actually need a 400% upgrade that is equivalent to 38/19 m/c - they don't make those!
An alternative solution would be to use a balance bar set up with say a 25mm (1") front m/c and a 16mm (5/8") rear m/c that would give 240% variation and then accept 2/3x1/3 pivot arrangement.
At the moment you are/will not be getting the fronts working hard enough and there is a great danger that the pads will glaze regularly.
One last thought. Which way round did you plumb the front brakes - front m/c piston to the rear?