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4 pot sizing



Ph1 Tom

ClioSport Club Member
I remember reading a guide by Rally Design a few years ago about choosing the right piston size for 4 pots. See here http://www.rallydesign.co.uk/pdf/designing_4_pot_brakes.pdf

Now it says for working out a suitable 4 piston replacement for single piston callipers with sliders that the area of the piston should be doubled.

So even though the Clio has a single 54mm piston giving 2290 sq. mm. you have to take it as 4580 sq.mm. How does that work? There aren't 2 pistons per calliper, you're only moving 1 per side when you push the pedal.

Am I missing something....?!
 
  172 cup, Impreza P1
The slider is pulling the other side caliper for the front pad. If it didn't, you'd only wear the rear pad out.
 


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