After fitting Hispec 4 pot calipers and 280mm discs i thought i should do something about a probable leak from the master cylinder, the clue being rust and bubling paint on the servo. The trouble began when i sheared off a stud holding the m'cylinder to the servo, no problem i thought i have a Mondeo m'cylinder/servo which i have heard is used as an upgrade and a bigger m'cylinder is probably a good idea after going from 2 to 8 pistons on the front. This i now believe was an olympic standard jump to the wrong conclusion. If i have done the maths right, ( I would be grateful if someone checked my results) i need to go down in m'cylinder bore size. Now i know calculations of braking forces are really complex but this just about the "feel" of the brakes. Here are the figures i used, original calpers single 48mm piston, new calipers four 31.2 mm pistons, rear slave cylinder 17.5mm, original m,cylinder 20.6mm, mondeo m'cylinder 25.4 Which give an original set up m'cylinder/caliper ratio ~ 1:23, original m'cylinder + new calipers ~ 1:20, mondeo m'cylinder + new caliper ~ 1:13 So given Fiesta mk2 servo's are not exactly thick on the ground i thought about a set up similar to that recently used on 003, ie. landrover servo + Mk1 19mm m'cylinder which should give me a ratio ~ 1:23 I would really appreciate it if anyone can say to me " Your are talking nonsense and here's why......" or " Yes that should work but be aware of ......."
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