ah yes John I had the same issue. And at castle combe it was embarrasing locking up the front wheels every time i came up the the chicanes...!
The standard 1.6 FWD brake set up is not good enough for us with the heavier T16 engined 5EXis.
I immediately switched the rear callipers and discs for the larger rover (ZS?) set-up...which has helped a lot...but I reckon I will have to go larger again at the back to ensure better braking performance on the track (with an adjustable valve in-line).
Look at other lightweight mid-engined cars eg lotus elise...disc size at the back is the same at the front...etc...etc...MK1 Lotus Exige is a good example to follow as it has the same weight and distribution as our cars john...
HTH, John
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