timf
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| posted on 30/5/03 at 01:16 PM |
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brake bias adjustment
I found this http://www.stockcarproducts.com/tech1k.htm
it may be useful for those with biar bars and how to roughly set them up
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Findlay234
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| posted on 31/5/03 at 12:33 PM |
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Cheers, recieved my pedal box and bias bar yesterday, so thatl be very usefull. one of the reasons for logging on now was to ask how to do it.
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fastenuff
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| posted on 31/5/03 at 05:41 PM |
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nicely copied from Wilwood, thank you very much.
Looked very familiar so had a look at wilwood, very much the same
Ingmar
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macbrew
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 posted on 3/6/03 at 07:50 PM |
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????????????
I think I know what a bias bar does but will somebody explain how, what, why and do I need one ?
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Findlay234
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| posted on 4/6/03 at 08:25 AM |
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the front brakes need more force than the rears to pass SVA. IE the fronts should lock up first in harsh braking. When you have a single master
cylinder like the one out of your donor escort or sierra you will need a valve in the rear brake line to limit the force going to the rear
drums/discs. this get fiddly to use and if you use the sierra one you have to mount it just right or it wont work. The other way is to have 2 master
cylinders. one larger than the other (smaller one for the rear) then for any minor changes you use the bias bar, which just acts as a lever between
the two MC's. you push with the pedal at a point along the the bias bar between the MC's. the closer to one of the MC's the more
force it gets. Really bad description but hey, its free.
A picture would clear things up, if you want
[Edited on 4/6/03 by Findlay234]
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Alan B
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| posted on 4/6/03 at 03:23 PM |
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I'll just add here that often the the two MC's are the same bore....in my experience....but otherwise agree with that...
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Findlay234
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| posted on 4/6/03 at 03:50 PM |
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I didnt think the bias bar gave enough of a difference between the front and the rear. Im just about to get my MC's and was gonna get .75 for
the front and .70 for the rear but now your making me wonder......
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Chazzy
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| posted on 4/6/03 at 03:56 PM |
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If you assume for the momet that all pistons are same size and the bias bar is set to give equal force then you need the smaller MC going to the front
brakes.
Smaller area = larger pressure in fluid giving more resultant force from piston(s)
(Force = Pressure X Area)
Most rear brakes have a smaller piston as well to decrease the force.
As you say the Bias bar gives fine adjustment.
The stuart taylor kit has different sizes MC's.
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Chazzy
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| posted on 4/6/03 at 03:59 PM |
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Sorry re reading that, it looks a bit ambiguous, the piston in the first sentence is the brake calliper piston.
Good luck!
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Alan B
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| posted on 4/6/03 at 05:10 PM |
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Findlay.....you should find the bar will give quite a lot of adjustment, however it is worth checking what others have done....I have seen it both
ways, just more often with 2 the same......although in lots of applications, not just Locost....
Worth asking I guess?
I could be wrong......it does happen...
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Alan B
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| posted on 4/6/03 at 05:22 PM |
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I've just read my Tilton instructions for my brake bias bar....mine is for 2.5" centres...it says 3/8" off centre will give that
side 65% and the other 35%.....IOW one can get nearly double the force of the other......
It does also say that if this isn't enough then go ahead and change sizes.
HTH
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craig1410
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| posted on 4/6/03 at 11:20 PM |
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Alan,
I like you floor mounted pedals but won't you have trouble with fluid draining back into the MC from the calipers. Are you planning to put a
light pressure non-return valve in there? I'm not being critical but I am trying to decide between floor mounted and swinging pedals and have
been waying up the pro's and con's of late.
If you had the MC's with the remote reservoir that would probably help.
Cheers,
Craig.
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craig1410
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| posted on 4/6/03 at 11:21 PM |
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sorry for my dodgy spelling...
weighing, not waying! Doh!
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Alan B
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| posted on 5/6/03 at 01:43 AM |
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Craig, yes you are correct, I'll be doing one of those things.......whichever is cheapest I'd suspect..
The master cylinders were very cheap, but I imagine remote res. replacements won't be... .....so the low pressure NR valve is the favourite..
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