Brake Pads

[AndyH]

Hi,

My Billet 4 are the same piston size front and rear, but the front master cylinder is a smaller bore than the rear.

Andrew

[ChrisCar6]

This was Martin's comment on my setup.

With 57mm floating calipers your front piston area is 5103 mm^2 per caliper and with 4 x 36mm pistons the rear piston area is 4071 mm^2 per caliper.

With equal sized master cylinders this gives a brake balance of 56% front and 44% rear.

This depends a bit on your front/rear weight split, but using figures from other Strats, for the front and rears to lock at the same time at 0.9G negative acceleration the ideal ratio should be 52% front and 48% rear. By a small adjustment of the bias bar for more rear bias you can get 53.3% front and 46.7% rear which will mean the fronts lock up just before the fronts .

I use Alfa 24v front discs front and rear. Would no doubt gain a weight advantage from swapping to 4-pot fronts.
Currently using Greenstuff all round.

[strat24v]

Hi,

My Billet 4 are the same piston size front and rear, but the front master cylinder is a smaller bore than the rear.

Andrew

Martin had said my similar setup would be ok, same calipers and discs front and rear, one size smaller master cylinder on the front.

[NoCorseChris]

Another vote of confidence for Martin's calcs. Eventually(!) followed his advice properly on my car when I had it and the braking was excellent. For a long time I had it with way too much front brake compared to rear. Was a bit of a mish-mash of bits, but it worked great in the end. Can't recall the numbers I used now but it was what Martin told me to use. You certainly do need a good dose of rear brake capacity.

[Bernard]

Another vote of confidence for Martin's calcs. Eventually(!) followed his advice properly on my car when I had it and the braking was excellent. For a long time I had it with way too much front brake compared to rear. Was a bit of a mish-mash of bits, but it worked great in the end. Can't recall the numbers I used now but it was what Martin told me to use. You certainly do need a good dose of rear brake capacity.

Also Chris you have more rubber contact patch on the Rear (Grp4) even with the weight transfer moving to the front