Cosworth 4wd brake conversion, which master cylinder?
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So i now have 4x4 cosworth calibers in front / 2wd discs. Rear i have full 4x4 cosworth brake setup. Front brakes dont have power.. rear brakes are too powerful. I already have wilwood bias valve between rear line but it would not help. I think rst standard master cylinder cant supply enough brake fluid for large calibers in front.
How you guys are solved this.
Thanks
How you guys are solved this.
Thanks
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One output is splitted for front brakes, and other is splitted for rear brakes. There is bias valve (wilwood) between rear brake line. Original rear axle bias valves are no more there.
Tomorrow i will change pads, i dont expect wonder but i have to try.
Tomorrow i will change pads, i dont expect wonder but i have to try.
Last edited by Antti O; 11-07-2011 at 08:08 PM.
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Cool, now i found out that i have wrong type of caliber piston in right caliber because it would not go deep enough to fit new pads. There is different number for escort cosworth piston and sierra 4x4 cosworth pistons so i have to take some measurements i think.
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Okay so it was my fault, 1 of calibers was non-original replacement caliber and its piston was different size than original caliber. So i have to swap pistons between 2 calibers and now front brakes are fine but i have to push brake pedal almost in floor until car really stops. I think master cylinder is not powerful enough to supply full set of 4x4 cosworth brakes.
Now it would be nice if someone can recommend some upgrade master cylinder + servo package.
Now it would be nice if someone can recommend some upgrade master cylinder + servo package.
Last edited by Antti O; 12-07-2011 at 05:32 PM.
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Maybe escort mk5?
master cylinder Escort 91- 1.6 ř25
* 1,6/1,8i 93->94 ř25,4 (no ABS) [1993-1994]
So if i can find 93-94 1.6/1.8 with no abs from scrapyard maybe servo+master cylinder will do the job?
master cylinder Escort 91- 1.6 ř25
* 1,6/1,8i 93->94 ř25,4 (no ABS) [1993-1994]
So if i can find 93-94 1.6/1.8 with no abs from scrapyard maybe servo+master cylinder will do the job?
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The RST master is also 25mm and also the RST caliper pistons are exactly the same 60mm as the Escort Cosworth caliper pistons, so you should have not seen any change actually.
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I was always under the impression that cars using proper abs with a pump has slightly larger calliper pistons, but i've never measured any so that could be hearsay.
BTW, if your brakes are very spongy after a good bleed, try wedging the brake pedal down over night, i had to do this, i think it helps with trapped air in the system.
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I dont know if i have original rs turbo master cylinder or not.
But one important question:
Is there any difference which output i use in my rs turbo master cylinder for front brakes?
But one important question:
Is there any difference which output i use in my rs turbo master cylinder for front brakes?
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The size typically reads on the side of the master cylinder as in "25" or "22".
I'm still using the 22mm cylinder as I haven't needed the increased volume and it gives a lighter pedal feel. The pedal never goes below teh first quarter.
I also have a Cossie servo package with an adapter to fit the RST just waiting installation...
I'm still using the 22mm cylinder as I haven't needed the increased volume and it gives a lighter pedal feel. The pedal never goes below teh first quarter.
I also have a Cossie servo package with an adapter to fit the RST just waiting installation...
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