RST With rear disc conversion pulls badly when braking hard
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RST With rear disc conversion pulls badly when braking hard
Hi!
I have sierra cosworth rear disc conversion completed wit all new parts.
Only old part is std brake bias valves. Brake bias (front/rear) itself is spot on but car pulls right badly when i brake fast / hard, in slow and easy braking there is no problems. Ive got 290mm sierra cosworth front discs too and braided hoses. Car was in brake dyno and there brake balance in rear was also good and there was no any problems.
I know car is very dangerous now. Do i have to change rear bias valves?
My koni adjustables are now all set to same so the problem is not in shocks.
Sorry my bad english.
I have sierra cosworth rear disc conversion completed wit all new parts.
Only old part is std brake bias valves. Brake bias (front/rear) itself is spot on but car pulls right badly when i brake fast / hard, in slow and easy braking there is no problems. Ive got 290mm sierra cosworth front discs too and braided hoses. Car was in brake dyno and there brake balance in rear was also good and there was no any problems.
I know car is very dangerous now. Do i have to change rear bias valves?
My koni adjustables are now all set to same so the problem is not in shocks.
Sorry my bad english.
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loose the standard bias valves, thats causing your problem!its unloading the the power from the back so the front is working harder so the back end goes light, u want more braking power to the rear wehn u have discs
IMO, loose the rear discs, there dangerous full stop!
IMO, loose the rear discs, there dangerous full stop!
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loose the standard bias valves, thats causing your problem!its unloading the the power from the back so the front is working harder so the back end goes light, u want more braking power to the rear wehn u have discs
IMO, loose the rear discs, there dangerous full stop!
IMO, loose the rear discs, there dangerous full stop!
But if i buy some proper rear bias valves and adjust them in same position? There is some valves in sale which have for example 7 different settings so i can adjust both sides in same.
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I have to check that
#9
focus rs 1672
loose the standard bias valves, thats causing your problem!its unloading the the power from the back so the front is working harder so the back end goes light, u want more braking power to the rear wehn u have discs
IMO, loose the rear discs, there dangerous full stop!
IMO, loose the rear discs, there dangerous full stop!
its badly set up brakes that are dangerous,rear discs will out perform any brake drum set up if set up proper,that includes master cylinder which most people forget about
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rear discs are dangerous???so why does every performance car come with rear discs and perform well??
its badly set up brakes that are dangerous,rear discs will out perform any brake drum set up if set up proper,that includes master cylinder which most people forget about
its badly set up brakes that are dangerous,rear discs will out perform any brake drum set up if set up proper,that includes master cylinder which most people forget about
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rear discs are dangerous???so why does every performance car come with rear discs and perform well??
its badly set up brakes that are dangerous,rear discs will out perform any brake drum set up if set up proper,that includes master cylinder which most people forget about
its badly set up brakes that are dangerous,rear discs will out perform any brake drum set up if set up proper,that includes master cylinder which most people forget about
a rear light RST no abs,no, how can u set the rear discs up for every road type?
theres enuff storys on here of people crashing after converting to rear brakes, yeah, they might of needed setting up, but, it still happens!
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when i had my escort on the road with my 6 pots and cossie rear discs i tested the brakes at around 130mph (emergancy stop) to see how good they were) mine stopped perfect with them with no skidding, admittedly the rear did start to get light eventually but braking hard at that speed id expect it lol
#17
focus rs 1672
nothing as std,its when its being asked to shift more fluid with 4 pots and rear discs that they cant cope
the fact u cant even talk proper leads me to dismiss anythin u say,rear discs are not dangerous,FACT,numnuts that put rear discs then dont get them set up,either using bias valve or compensators are dangerous,im included in this as i done the slame,so through my mistake i learnt,thgats called experience in my book,u can set a bias valve up for wet and dry conditions or as most do compromise in between,but thats not proper set up as ur not gettin the most out them in wet/dry conditions
check this thread a while back,more to setting up brakes than what u think
https://passionford.com/forum/ford-e...al-set-up.html
from factory,yeah,abs set rear brakes,fine.
a rear light RST no abs,no, how can u set the rear discs up for every road type?
theres enuff storys on here of people crashing after converting to rear brakes, yeah, they might of needed setting up, but, it still happens!
a rear light RST no abs,no, how can u set the rear discs up for every road type?
theres enuff storys on here of people crashing after converting to rear brakes, yeah, they might of needed setting up, but, it still happens!
check this thread a while back,more to setting up brakes than what u think
https://passionford.com/forum/ford-e...al-set-up.html
#20
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Hi, I’m looking to do a rear brake disc conversion soon I’ve almost bought everything needed but my question is will my rear brake compensator valves which were fitted last year so are near enough brand new be ok to adjust the rears?
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nothing as std,its when its being asked to shift more fluid with 4 pots and rear discs that they cant cope
the fact u cant even talk proper leads me to dismiss anythin u say,rear discs are not dangerous,FACT,numnuts that put rear discs then dont get them set up,either using bias valve or compensators are dangerous,im included in this as i done the slame,so through my mistake i learnt,thgats called experience in my book,u can set a bias valve up for wet and dry conditions or as most do compromise in between,but thats not proper set up as ur not gettin the most out them in wet/dry conditions
check this thread a while back,more to setting up brakes than what u think
https://passionford.com/forum/ford-e...al-set-up.html
the fact u cant even talk proper leads me to dismiss anythin u say,rear discs are not dangerous,FACT,numnuts that put rear discs then dont get them set up,either using bias valve or compensators are dangerous,im included in this as i done the slame,so through my mistake i learnt,thgats called experience in my book,u can set a bias valve up for wet and dry conditions or as most do compromise in between,but thats not proper set up as ur not gettin the most out them in wet/dry conditions
check this thread a while back,more to setting up brakes than what u think
https://passionford.com/forum/ford-e...al-set-up.html
numb nuts is 2 words!its compensator's
anything has a G on the end, dont should be spelt like don't , so dont say i cant write proper dude
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So i have to rebuilt brake lines because those are original diagonal. So i will buy one brake bias adjuster and set of new brake lines.
I comment when i have done that.
I comment when i have done that.
#23
focus rs 1672
did i say write???i says talk
so no follow up to the dribble u wrote,thats ur best,carry on
Last edited by JamboRS; 11-08-2009 at 11:07 AM.
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I cant see why you would need to go down the route of changing master cylinders to get the braking on the back right? that just doesn't make sense, when there are other easier methods!
#27
focus rs 1672
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv vvvvvv
Originally Posted by Antti O
So whats problem with rs turbo master cylinder & disc brakes?
nothing as std,its when its being asked to shift more fluid with 4 pots and rear discs that they cant cope
the std master cylinder is shit with 4pots AND rear discs
out of interest what master cylinder does a 2wd cossie have in comparison to an rst ?????
Last edited by JamboRS; 11-08-2009 at 10:32 PM.
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So whats problem with rs turbo master cylinder & disc brakes?
nothing as std,its when its being asked to shift more fluid with 4 pots and rear discs that they cant cope
the std master cylinder is shit with 4pots AND rear discs
out of interest what master cylinder does a 2wd cossie have in comparison to an rst ?????
nothing as std,its when its being asked to shift more fluid with 4 pots and rear discs that they cant cope
the std master cylinder is shit with 4pots AND rear discs
out of interest what master cylinder does a 2wd cossie have in comparison to an rst ?????
so what are you advising everyone to run?
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The plan for mine was, if this will help, was to fit cossie stuff front and back. Losing the ABS and the rear compensators. And then to control and balance of the flow to the rears, use a bias valve on the rears, so effectively just having a permanent fixed pressure to the rears, rather then using weight varying compensators.
The secret to good braking with the rear disc conversion is balance. In my opinion the best way of achieving the balance on the rears is by means of a bias valve. As its a quick solution, although would recommend improved breaks up the front.
I think initial problems occur with the rear disk conversation if no attention is made to the fronts. As just fitting rears dicks without improving the fronts, will instantly increase the breaking percentage more then required before youve even started.
As for your problem of it pulling when breaking, check the calipers, just to make sure one aint sticking or some thing.
Good luck mate, and dont be put off by the haters, they fear what they dont understand.
Cheers
The secret to good braking with the rear disc conversion is balance. In my opinion the best way of achieving the balance on the rears is by means of a bias valve. As its a quick solution, although would recommend improved breaks up the front.
I think initial problems occur with the rear disk conversation if no attention is made to the fronts. As just fitting rears dicks without improving the fronts, will instantly increase the breaking percentage more then required before youve even started.
As for your problem of it pulling when breaking, check the calipers, just to make sure one aint sticking or some thing.
Good luck mate, and dont be put off by the haters, they fear what they dont understand.
Cheers
#33
focus rs 1672
im not advising anything,im merely stating that a master cyl designed to run single pots fronts and rear drums is shit when running 4 pots and discs,a completely new braking system which the std master cyl was made for
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Adjusted original bias valves in rear axle. Last night i drive it lot and it is fine&safe now but there is no so much braking power as earlier so i may next spring buy proper bias valve and make new brake lines to correct that.
#39
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Well first you need to define stiffer!Does it mean you have to press the pedal harder/with more force to stop the car, or does it mean that the pedal requires more force to move it a certain travel?!
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Another year and same problem. I wish i never got into rear discs.
Now i have one brake circuit for fronts and one for rears and in the rear circuit there is wilwood valve with 59% max reducing going.
I have been thinking to replace stock rs turbo front cylinders with sierra cosworth 4 pot if that can help. I know those calibers are not cheap and not so easy to find.. but that rear brakes overpower drives me crazy and car is dangerous.
Now i have couple of questions:
1) Where i can get some cad pictures about those front brackets or who sells brackets?
2) Or is it better option to reduce rear brake disc size 273mm-> 253mm
ps.
If you read this and still plan to do rear disc conversion instead of working drums, DONT DO THAT.
Now i have one brake circuit for fronts and one for rears and in the rear circuit there is wilwood valve with 59% max reducing going.
I have been thinking to replace stock rs turbo front cylinders with sierra cosworth 4 pot if that can help. I know those calibers are not cheap and not so easy to find.. but that rear brakes overpower drives me crazy and car is dangerous.
Now i have couple of questions:
1) Where i can get some cad pictures about those front brackets or who sells brackets?
2) Or is it better option to reduce rear brake disc size 273mm-> 253mm
ps.
If you read this and still plan to do rear disc conversion instead of working drums, DONT DO THAT.
Last edited by Antti O; 11-08-2010 at 11:31 AM.