chanded to a rear disc set up on my s2 cosworth front and back front work fine but rear there is hardly any flud getting there like no pressure do you have to change the master cylinder if so what to doing my head in changed pipes

 

the m/c is only pushing enough fluid through to move a set of tiddly cylinders, not enough to move a set of calipers

 

master cylinders are fine when using cosy brakes all round,

did the car hae abs before?

 

isnt there a valve on the back of RST that means you have to jack the wheels up in the air to bleed the backs? im sure there's something funny about the rear brakes on an RST, best check with someone who knows, possibly christian & becky?

 

you have to bleed rst brakes with the car ON THE GROUND and if you can load the boot up aswell then thats all the better
the load bias valves are closed with the car in the air

i had discs all round and master cylinder was more than man enough

 

thats only when you lower it
the brake proportioning valve just needs adjusting otherwise it locks the rears up as it thinks there are more people in the back than normal

 

yep .. so it allows more fluid to the rears ...hence why you do it on the ground

 

could you not just get the front higher up than the rears mate?
or does the suspensinneed to be o nthe deck to do it?

never really fooled around with this sort of thing but i do rememebr someone saying that you could open the valve and shorten the rod by a few mm to sort the problem

any views?

 

shouldnt matter, he only needs to drop the car on the ground so he can bleed the brakes, doesnt sound like he's got a problem with the rears over-braking

 

needs to be on the deck to allow the load valves to open .. the more weight in the boot the better they open ..