ken555
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| posted on 17/4/18 at 02:46 PM |
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Brake Calcs
This is my current brake set-up
Front = Girling D12R = Piston Diameter = 42.8mm (1.68" ) Twin pot
Rear = Golf GTi Mk2 = Piston Diameter = 36mm (1.41" ) Single pot, sliding carrier
Pedal is a standard mini set-up so ratio is 6:1 I believe
Car is mid engine, about 60% of weight at rear.
I have a brake balance bar, and can change master cylinders if needed to adjust the balance/feel a bit.
But the Maths is beyond me to work out a suitable master cylinder size, at the
moment it's 0.81" and 0.625"
What would be a better size?
[Edited on 17-4-18 by ken555]
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dinosaurjuice
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| posted on 17/4/18 at 03:51 PM |
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cant comment on the front/back ratio required. But on a twin piston caliper where the pistons are opposing you only count the area of ONE of the
pistons 
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ken555
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| posted on 17/4/18 at 06:17 PM |
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I have just read that the master cylinders should be between 12 to 14% of the brake area.
Girling Cyl = 0.81 dia = 0.52 area
Willwood Cyl = 0.625 dia = 0.3 area
Front Girling = 1.68 dia = 5.64 area
Rear VW = 1.41 dia = 1.54 area
14 % front = 0.784
14 % rear = 0.215
Looks like the front could do with bigger.
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