DaveFJ
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| posted on 24/1/05 at 05:35 PM |
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Uno brake bias valve
Just done a search and can't find the relevant thread, can anyone point me in the direction of how to plumb in and do the neccessary alterations
to my newly aquired fiat Uno brake bias valve?
cheers
Dave
"In Support of Help the Heroes" - Always
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nick205
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| posted on 24/1/05 at 06:30 PM |
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I made a steel bracket to fit the valve to the footwell bulkhead. The bracket has an adjustable bolt which limits the travel of the bias valves
plunger (it rises with pressure). The rear brake line from the master cylinder is then routed through the valve into the lower union and out of the
top union.
Hopefully the pictures will make this clearer....
 
Rescued attachment 031219-07.jpg
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nick205
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| posted on 24/1/05 at 06:30 PM |
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and another....
 
Rescued attachment 2.JPG
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Mark Allanson
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| posted on 24/1/05 at 07:07 PM |
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variation on the same theme
 
Rescued attachment BrakePedals&Cylinder.JPG
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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bob
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| posted on 24/1/05 at 07:18 PM |
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And again
 
Rescued attachment MK Indy build pics 081.jpg
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craig1410
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| posted on 24/1/05 at 10:11 PM |
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Hi,
I've done something similar as well and would like to add an important point.
For SVA remember to lock up the adjustment bolt. A split pin or lock nut is not considered suitable so you need to either tack weld it or use a roll
pin. This is explicitly permitted provided the roll pin is fitted properly.
For what it's worth I fitted my bias valve above the diff against the seat back panel.
Cheers,
Craig.
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DaveFJ
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| posted on 24/1/05 at 10:25 PM |
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thanks all, as ever a picture paints a thousand words...
Dave
"In Support of Help the Heroes" - Always
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bob
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| posted on 24/1/05 at 10:36 PM |
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As most end up taking the retest at SVA i went through with no adjuster on my valve,i thought i would set it at the test and throw a weld on it or pin
it after.
As luck would have it the brakes were fine with no adjuster (M8 bolt) the examiner and his examiner scratched there heads a bit but after a brief
meeting they decided it was ok 
for the record i have the regular sierra/granada rear calipers and the uno valve was bolted on with a 13mm gap between the push rod and the top of the
holderalso the top of the push rod is cut flat.
hope this helps.
Also just to make things worst,an indy went through SVA at Beverley with rear discs and no reduction valve according to snoopy at MK.
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Ben_Copeland
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| posted on 25/1/05 at 09:41 AM |
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Have any of you found that when you hit the brakes the bracket holding your adjuster flexs as the valve pushes against it? Had to strengthen mine,
tho seeing all the neat ones on here i might redo mine cos it's ugly!
Ben
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jps
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| posted on 28/3/19 at 10:37 AM |
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Ancient thread revival I know - but are the Uno brake bias valves in any way still useable for IVA? Or is there a current alternative? I'm
running discs all round - and a single M/c setup so already expect to have problems with rears locking first
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Charlie_Zetec
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| posted on 28/3/19 at 12:04 PM |
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Last I heard brake bias valves were still permitted for IVA - as long as they were locked/lockable and unable to come loose.
I see no reason why something like THIS wouldn't be acceptable, assuming it was fixed
with a roll pin, lock wire etc. - after all, that's what usually holds the balance bar in position on dual M/C pedal box setups....
Lets wait and see if anyone has recently passed IVA with a similar setup, or you could take a punt and call the local IVA centre and ask for their
perspective on the issue? Just remember to get a name or ideally something in writing, as I suspect you'll get different answers on different
days from different people!
Artificial intelligence is no match for natural stupidity!
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Schrodinger
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| posted on 28/3/19 at 06:29 PM |
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I passed the IVA with a twin cylinder bias setup and a sticker from CBS that says something to the effect that adjusting the bias may lead to the car
no longer meeting regulations and that was acceptable, try contacting the centre where you are taking your test and ask their view.
Keith
Aviemore
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