The brake one is good too:
http://www.pirate4x4.com/tech/billavista/Brakes/
" .. Thus, multi-piston callipers can be used to achieve greater TOTAL piston area than you could fit with a single piston. That said – a multi-piston calliper is only “more powerful” if the total area of its pistons is greater than the alternative. I.e. – if your buddy is bragging about his bling “multi-piston” callipers, but each has an area of only two square inches, and you have an old truck calliper with a single huge piston of four square inches area, you can comfortable laugh in his face! With floating callipers, effective piston area is the area of the actual piston(s), multiplied by two, because of the sliding action bringing the other side of the calliper into contact"
Posted: Wed Apr 02, 2008 11:04 am