upgraded to 280mm callipers and discs off a seat cupra 20v turbo and not happy with the pedal travel. brakes have been pressure bled at least 5 times, regulator held open etc but still no go. car is a '90 16v with the original 22.2mm(?)MC. Does anybody else have this problem? Since the callipers are quite a bit bigger than the 256mm ones, I was thinking that the pistons must be bigger hence the longer pedal. always thought that 280/256 had same size piston tho...
I thought they were the same size too If you've got rubber flexy pipes go round each in turn and clamp them off one by one See if the pedal improves. If it does, you've still got air in there. Also adjust the rear bias, to see if it improves it too - it did on mine, be careful of doing it too much and the rears locking tho
make sure it's a 22 mc, if it originally had 239s on it'll on;ly be 20mm and will give a long pedal also make sure the bias valve is right open or you wont get the rears bled properly
f**k knows....i bled them like 50 times and then got p**sed off with them so just drove it like it is since. wasn't as bad when i bought the car (had o.e. pads) but wasn't that good either. changed all the pads to pagid fast road, but had to take the rear calipers off (long story) so i'm sure there's still some air in the rears but i can't get it to come out (and yes, i have held the bias valve in, or out, whatever it's supposed to be!). pretty sure fast road pads don't help tho. on my last car the pedal went long and a little squishy when i put fast road pads on, went back to o.e. and it became perfect again. was okay as they would only overheat when i really really went for it with a full car. unfortuantly i seem to be able to overheat the vr's brakes with just me in the car...but i'm still tempted to go and get some proper vw pads when these run out and hope they can take it (dunno what pads were on when i bought it...could've been cheapo's - there the ones that overheated).
I have bled these brakes loads... pressure bleeder, bias valve fully open, big mc (was on 256s originally) and no go. No leaks in the system and when I apply pressure they haul the car down brilliantly well. Pads are pagid FR. Maybe the seat uses a bigger piston? (unlikely) has anybody compared 256 and 280 callipers cos there was a huge difference in size and weight on mine. kind of wish I kept the 256 ones now... anybody know what size the seat cupra 20vt MC was? can anybody look it up on etka for me? cheers
Theres some good info on that site. I am a little confused however by the statement Slide the bolt/nut until the spring is just snug between its end points Brake bias picture Would I be right in thinking that this is referring to the coils on the spring? (i.e. the spring should appear almost compressed) In the correct position should the spring look like in the picture? I had a similar problem with my 280 set up when I first fitted them I did use the orignal 256 callipers however. I replaced the original 22.2 MC with a brand new 22.2MC and it made a notcable difference, it was around 30 however fitting it was quite akward and time consuming. Pete
MOFOs!!! Pressurised by an electric pump? WTF? Does that mean that non abs cars with 280s have smaller pistons? Did they make non abs cars with 280s?
Peter, you have to set it so the spring is just tensioned, enough to stop it wobbling about. The 288 callipers on mine have much bigger pistons, so a biiger m/c would help shift more fluid. Did all corrados with the 280 setup run abs?
oh right. never knew how abs worked before. cheers guys. so does that mean that everybody running upgrade 280s (with 280 callipers) has a longer pedal since they were all originally abs? DT ...times like this when I just reach for the bottle...
