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+--- Thread: Bias valve or not? (/showthread.php?tid=27842)
Bias valve or not? - dr_jekyll - 19-11-2014
Right looking into removing the abs.
If I run the 23mm gti-6 master cylinder (2 ports with splits in line) do I require a bias valve in line to distribute the brakes correctly? Or is this automaticaly done by the master cylinder?
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RE: Bias valve or not? - Mattcheese31 - 19-11-2014
No, use the bias valve mate
RE: Bias valve or not? - dr_jekyll - 19-11-2014
Is there a standard bias valve for 306's? Seen the 4 port master cylinders and assumed it was controlled by the master cylinder
RE: Bias valve or not? - bashbarnard - 19-11-2014
Its called rear compensator. Its on the axle
RE: Bias valve or not? - dr_jekyll - 19-11-2014
If your on about the load compensator I deleted it with parts from my other 306.
RE: Bias valve or not? - bashbarnard - 19-11-2014
Then you really need a bias valve. I'm running no compensator ATM. Need to buy one for mine
RE: Bias valve or not? - dr_jekyll - 19-11-2014
Ok fella, cheers for that.
I pressume you only run a bias to the rear lines to turn it down and tame them?
RE: Bias valve or not? - jamiek_uk2000 - 19-11-2014
The phase 1 GTi6 had the rear compensator, the phase 2/3 didn't have it as it was done by the ABS unit.
If you are taking the pipes straight to the rear (which it does sound like if you are taking the lines straight from the master cylinder) then you will have to have a bias valve somewhere. In the car allows for on the fly if your on a track and the weather get's wet. Can be under the bonnet as a fit and forget.
If you don't then you'll have 50/50 braking which will mean the back will lock up all the time
RE: Bias valve or not? - swampy - 19-11-2014
Yes you run it in the rear line.
Where you fit it is up to you, some people fit them under the bonnet others inside the car by the handbrake
I can supply willwood knob adjust ones for a good price
RE: Bias valve or not? - dr_jekyll - 19-11-2014
Thats the exact info I wanted
will be under bonnet job as its a road car
RE: Bias valve or not? - fatlapit - 25-11-2014
u dont need alot to the rear
id go to a quiet open road and play with it
RE: Bias valve or not? - dr_jekyll - 26-11-2014
Will prob stick it on a brake tester and have a play
RE: Bias valve or not? - Moonpie - 27-11-2014
Fit one. 50/50 braking can be scary. ( tho can be fun lol)
RE: Bias valve or not? - fatlapit - 27-11-2014
i run 10% to the rear on mine. sometimes 20
RE: Bias valve or not? - Stef205 - 27-11-2014
i dont run a bias valve at all in my 205, never had a issue. Just try it with out before jumping the gun.
RE: Bias valve or not? - bashbarnard - 21-01-2015
Right so today I looked round lus new car. Phase one kingfisher green that's rust free
. But has a dead axle. What I did notice is that it has no abs and no load compensator. I have full history with the car. And I mean full even headlamp bulb receipts. No rear beam change therefore its original. I thought they all had a form of compensation on them
RE: Bias valve or not? - Toms306 - 21-01-2015
Don't need a compensator with drums as far I as know. They're not efficient enough to need the brakeforce reducing lol.
RE: Bias valve or not? - bashbarnard - 21-01-2015
You sure all of mine had compenators with drums.
RE: Bias valve or not? - Toms306 - 21-01-2015
Did they have ABS though?
I'm pretty sure non-ABS drum 306s don't have them but I'm sure someone will be along to correct me lol.
RE: Bias valve or not? - bashbarnard - 21-01-2015
Some did some didn't. All had compensators. Hope someone sheds some light on this.
RE: Bias valve or not? - dr_jekyll - 22-01-2015
Intresting. So could mean i havnt got to fit a bias maybe? Ngl havnt looked into it anymore as got overwealmed with sorting other niggles
RE: Bias valve or not? - da_no1 - 22-01-2015
I have a standard Dturbo with rear drums from 1995 and it doesn't have ABS or rear compensator.
RE: Bias valve or not? - welshpug - 22-01-2015
they have inbuilt pressure limiters in the wheel cylinders, Drum ABS models have load compensators, late phase3 have EBD
drums really are as strong as a rear disc, hence the pressure limiters.
RE: Bias valve or not? - bashbarnard - 22-01-2015
Fair enough. That's new info for me. Least I know.
RE: Bias valve or not? - Mattcheese31 - 23-01-2015
I think it depends which rear drums you have, they fitted girling and bendix iirc, small and big, the big ones have a load compensator I believe
RE: Bias valve or not? - dr_jekyll - 02-02-2015
Had a brake pipe fail the other day so gotta re-do it. Gonna do the abs delete without the bias to see if it works or not. Need to bleed the whole system again no matter what as also fitting braideds
RE: Bias valve or not? - aggyj17 - 02-02-2015
If you run the brake pipes without a bias valve I would put a joiner near to where you would put the bias valve because if you need to run one it will be easier to fit it and wouldn't need to mess about as much