Back end lockup :(
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Hi this morning under harsh braking the back cossie brakes i put on my rst locked up, anybody know of any valves i can put on to make this not happen? Cheers
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I run the in line valves from a ka or fiesta,and i have removed my standard load valves ,my rear disks and calipers are from a focus so maybe slightly smaller aswell. Got the valves on my track car aswell and they work fine on that under heavy braking
Last edited by Twins; 26-07-2011 at 05:48 AM.
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do you have any pictures of those line valves? I have exact same problem with rear brakes. Front 4x4 cossie brakes and rear cossie 4x4 brakes with wilwood bias valve.
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The best setup for this is using NON ABS brake lines and compensators off an escort.
You will need a 23 rating master cly and remove all the current lines. ALL OF THEM!
The non abs compensator valves can be changed in angle to allow less or more pressue to the rears.
No mods are required to fit and the parts are available pretty easy.
You will need a 23 rating master cly and remove all the current lines. ALL OF THEM!
The non abs compensator valves can be changed in angle to allow less or more pressue to the rears.
No mods are required to fit and the parts are available pretty easy.
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I think jano is reffering to these on the left of the picture mounted on the bracket
![](http://i82.photobucket.com/albums/j280/xrmalin/rebuild%20on%20the%203i/25092010043.jpg)
These are on my 3i as i dont think turbo's have them
mark.
![](http://i82.photobucket.com/albums/j280/xrmalin/rebuild%20on%20the%203i/25092010043.jpg)
These are on my 3i as i dont think turbo's have them
mark.
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Do you have any idea why my rear brakes are 10x more powerful than fronts?
In mot station they told that rear brakes are very powerful compared to fronts. I have now wilwood bias valve limiting -59% rear brakes but still in rollers rear are more powerful. There is 4x4 cosworth calibers & 2wd discs in front and 4x4 cosworth 273mm rear discs & calibers.
My master cylinder is ABS rst standard.
In mot station they told that rear brakes are very powerful compared to fronts. I have now wilwood bias valve limiting -59% rear brakes but still in rollers rear are more powerful. There is 4x4 cosworth calibers & 2wd discs in front and 4x4 cosworth 273mm rear discs & calibers.
My master cylinder is ABS rst standard.
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Do you have any idea why my rear brakes are 10x more powerful than fronts?
In mot station they told that rear brakes are very powerful compared to fronts. I have now wilwood bias valve limiting -59% rear brakes but still in rollers rear are more powerful. There is 4x4 cosworth calibers & 2wd discs in front and 4x4 cosworth 273mm rear discs & calibers.
My master cylinder is ABS rst standard.
In mot station they told that rear brakes are very powerful compared to fronts. I have now wilwood bias valve limiting -59% rear brakes but still in rollers rear are more powerful. There is 4x4 cosworth calibers & 2wd discs in front and 4x4 cosworth 273mm rear discs & calibers.
My master cylinder is ABS rst standard.
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I am using abs master cylinder. First outlet is splitted for front brakes and second output is going rear of the car and there splitted for rear brakes. Between that line is normal wilwood bias valve. There is no more original axle bias abs system valves in use.
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Is there different size brake pistons in master cylinder?
Last edited by Antti O; 28-07-2011 at 10:03 AM.
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If you swap the chambers I can only imagine the problems you could cause.
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The front chamber is meant to work the front brakes and the rear chamber works the rear brakes. There is a spring between the 2 chambers and plungers which makes the rears come on first for a brief moment to make the car stable under braking. I think the diameter of the master cylinder chambers is the same but they could be different in terms to length and shape.
If you swap the chambers I can only imagine the problems you could cause.
If you swap the chambers I can only imagine the problems you could cause.
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Swap them round with some adapting pipes first and have a go.
Lee
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I have picture here. This is how my brake setup was before modifying it. I am not sure if master cylinder outputs are connected precise as factory built it but you get idea. So based my information and this picture i cannot understand why there is some difference between front and rear output in master cylinder.
![](http://aor.kuvat.fi/kuvat/S2%20RST/rst_abs_piping.jpg/full)
And this is my current setup, front brakes powerless and rear brakes too powerful.
![](http://aor.kuvat.fi/kuvat/S2%20RST/rst_abs_piping.jpg/full)
And this is my current setup, front brakes powerless and rear brakes too powerful.
![](http://aor.kuvat.fi/kuvat/S2%20RST/rst_brakes.jpg/full)
Last edited by Antti O; 29-07-2011 at 06:43 AM.
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Last edited by Antti O; 29-07-2011 at 10:35 AM.
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Antti ,have you also removed your standard rear load compensators ,on mine i run standard rst master cylinder ( 2 outlet) abs removed ,standard rear load valves removed and replaced with ka versions ,no lock up no matter how hard the braking on both my cars ,i dont run cossie rear brakes though ,st 150 on one and standard focus rear disks on the other
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Yes i have removed those. Look picture.
What is interesting i am currently limiting -59% rear brakes and those are still much too powerful, front brakes wont grip unless i press pedal really hard then something happens.
What is interesting i am currently limiting -59% rear brakes and those are still much too powerful, front brakes wont grip unless i press pedal really hard then something happens.
![](http://aor.kuvat.fi/kuvat/S2%20RST/rst_brakes.jpg/full)
Last edited by Antti O; 29-07-2011 at 11:36 AM.
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I think your problem is that one of your real wheels is thinner than the other and off to one side.
IMO
Both mastercylinder bores should be the same size as originally it was a diagonal split.
I would suggest that perhaps your master cylinder is defective OR you have air trapped, try a seriously good bleed. Using my new master cylinder i had to depress the brake pedal over night to release trapped air.
Im using RS turbo front callipers with with cosworth disks and standard rear drums, all compensator have been removed and replaced with new lines and a willwood bias valve.
My valve is adjusted to around the middle at the moment and all is well.
You can try swapping the MC connections over but im not convinced it will help you, if EVERY thing else fails you could always fit the inline compensator's and your willwood bias but i think you have an obvious problem somewhere.
Rob,
IMO
Both mastercylinder bores should be the same size as originally it was a diagonal split.
I would suggest that perhaps your master cylinder is defective OR you have air trapped, try a seriously good bleed. Using my new master cylinder i had to depress the brake pedal over night to release trapped air.
Im using RS turbo front callipers with with cosworth disks and standard rear drums, all compensator have been removed and replaced with new lines and a willwood bias valve.
My valve is adjusted to around the middle at the moment and all is well.
You can try swapping the MC connections over but im not convinced it will help you, if EVERY thing else fails you could always fit the inline compensator's and your willwood bias but i think you have an obvious problem somewhere.
Rob,
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