brake caliper piston sizes

[TheAngryDog]

My car has a 25mm master brake cylinder, and has 60mm single piston calipers on the front.

I am trying to work out what the equivalent sized multi piston calipers I could fit on the front.

Does anyone know how I can work this out?

Thanks

[TheAngryDog]

I'm pretty sure they won't offer me any advice as I am looking to use Brembo calipers from a Porsche, if they can use the right disc thickness

[TheAngryDog]

Its to go on my M5. I want to avoid over sizing the pistons on the caliper.

[TheAngryDog]

BritishRacinGrin said:

Just to clarify, when you say 'single piston' you mean two opposed pistons and when you say 'double piston' you mean four opposed pistons?

Anyway, surely it's not as simple as calculating the area of a 60mm piston, halving it and calculating a diameter from that figure? It depends what you're trying to achieve, more powerful caliper a or just greater pad / disc area.

The E39 M5 uses sliding calipers, so single piston.

There is a calculation that I am aware of, but I do not know what it is. Something tells me that 4 30mm pistons have the same area as a 60mm one, but I doubt that is right..

[TheAngryDog]

Thanks for that.

The StopTech kit that is used by various people use 2 34mm and 2 40mm pistons in each caliper, and they do not report any rear bias issues, or pedal travel issues, so I am now wondering if Brembo do a caliper like this.. thanks again.

[TheAngryDog]

Thanks again, every day is a school day!