Avoneer
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| posted on 9/4/04 at 09:06 PM |
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Fiat Uno Brak Bias Valve Thingy
Anyone got one lying around or know where to pick one up cheap? (apart from the scrappies).
Cheers,
Pat...
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However a large number of electrons were terribly inconvenienced.
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Brooky
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| posted on 9/4/04 at 09:13 PM |
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I know its not what you want to hear but I have only just given one to MikeR. Sorry.
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Mark Allanson
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| posted on 9/4/04 at 09:22 PM |
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GGB sell Fiat parts really cheap, they used to be in London but have relocated to Yorkshire I think, my old numbers do not work anymore!
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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craig1410
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| posted on 9/4/04 at 11:09 PM |
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Hi,
I got one from www.brakepart.co.uk for £13.95 brand new. Here are the details:
Fiat Uno adjustable rear brake compensator valve - £13.95 (P/N HRV1013)
At this price it's just not worth messing about at a scrapyard!
Cheers,
Craig.
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Mark Allanson
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| posted on 10/4/04 at 12:17 PM |
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Do they come adjustable, or do you have to adapt them? - any details?
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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craig1410
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| posted on 10/4/04 at 02:30 PM |
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Mark,
They are adjustable but you need to fabricate a bracket for the valve onto which a nut and bolt is welded. By screwing in the bolt you can increase
rear brake pressure. It does this by preventing the plunger on the valve from moving as far as it would in the absence of the bolt. Once you have set
the bolt to a suitable bias point it will need to be tack welded or held with a roll pin to comply with SVA regs.
There are a few pictures of this arrangement on the forum here and I'll try to dig them out. Watch this space.
Cheers,
Craig.
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craig1410
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| posted on 10/4/04 at 02:35 PM |
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Couldn't find the one I was after but here is a picture from "bob" 's photo archive. Hope you don't mind Bob...
 
Close up of bias and adjuster
Note that the plunger sits down when there is no pressure in the system and then rises up when pressurised until it hits the stop bolt. This is just
an evolution of the old mini type bias valve and I'm sure there will be a spring loaded valve inside which will require more pressure to close if
the bolt is pushing the plunger farther down. I understand that it requires quite "fine" adjustment but once set it is reliable and
consistent.
Cheers,
Craig.
[Edited on 10/4/2004 by craig1410]
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Avoneer
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| posted on 10/4/04 at 03:42 PM |
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£13.95 plus vat and £5 postage !!!!!!
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craig1410
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| posted on 10/4/04 at 04:53 PM |
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Still way cheaper than the £39.95+vat I was quoted by Fiat!!
I got a whole load of stuff from Brakepart at the time so the postage became insignificant.
I still wouldn't entertain any second hand braking parts from a scrapyard unless I could source a repair kit to replace all the rubber seals and
do a full rebuild.
Feel free to rub my nose in it if you can find it any cheaper.
Cheers,
Craig.
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Avoneer
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| posted on 10/4/04 at 08:24 PM |
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Cheers Craig,
Didn't mean my last post to sound ungrateful. My dad lives near the Bolton depot so will get him to pick one (and pay for it hopefully)!
Cheers,
Pat.....
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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craig1410
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| posted on 10/4/04 at 08:55 PM |
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quote:
Originally posted by Avoneer
Didn't mean my last post to sound ungrateful.
I know, I didn't mean to sound as though I thought you sounded ungrateful...
The good thing about forums is you can either take the advice or leave it! I have done equal amounts of each I'd say.
Brakepart is as cheap as any factor which I've come across although their website is a bit quirky!
Cheers,
Craig.
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Mark Allanson
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| posted on 12/4/04 at 11:12 AM |
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Craig,
Thanks for the help, there still seems to be a bit of debat if one is needed with rear drum, anybody got any commets?
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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craig1410
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| posted on 12/4/04 at 11:21 AM |
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I'm using discs myself but I'd have thought that you are better off having some way to limit rear pressure even with drums and at least
you can optimise the rear braking force if it becomes a problem during SVA.
Cheers,
Craig.
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Mark Allanson
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| posted on 12/4/04 at 04:29 PM |
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I had better get one then! Thanks
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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MikeR
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| posted on 12/4/04 at 10:01 PM |
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Mark,
IIRC if you've got the escort master cylinder, cortina front (M16?) brakes, escort 8" rear drums with crossflow engine you should be fine.
One of the guys from TOL days used to work for Girling and put the numbers through their computer.
Of course i've got 9" rears 
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Mark Allanson
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| posted on 12/4/04 at 10:07 PM |
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Iv'e got M16's at the front, but Capri axle at the back, 9" I think
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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craig1410
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| posted on 12/4/04 at 10:12 PM |
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Mark,
You don't have an Escort master cylinder either do you? I thought it was Sierra?
Cheers,
Craig.
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Mark Allanson
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| posted on 13/4/04 at 07:32 PM |
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I am not sure the master cylinder has much bearing on the pressure, as it will be the same on both circuits, but yes, I am using a sierra master
cylinder, and have just ordered a Fiat bias valve.
On the subject, where is the best place to fit it - next to the master cylinder is looking favorite at the moment
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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craig1410
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| posted on 13/4/04 at 07:54 PM |
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Mark,
Yes you're probably correct although I suppose it is possible that a tandem cylinder "could" have different bore sizes front and
back. I've never seen this though and can't think why it would be done.
As for the location question, I would agree that the front bulkhead next to the master cylinder would be favourite and is where I intend to mount
mine.
Cheers,
Craig.
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Mark Allanson
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| posted on 13/4/04 at 08:02 PM |
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I have just got to make sure there is enough room to get a lecky drill into the lock nut to fit a roll pin.
Does it have to be mounted vertically, I seem to remember from my Fiat days that that it was horizontal on the rear bulkhead?
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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craig1410
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| posted on 13/4/04 at 08:31 PM |
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Mark,
I don't know if it has to be mounted vertically or not but it seems to be the way most folk mount it. I agree it is probably not necessary
though.
Make sure you make up some rollpins the correct length so that you can drill it and fit it during the SVA. You'll probably need to fit a new
bolt at the same time.
Craig.
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Mark Allanson
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| posted on 13/4/04 at 08:46 PM |
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I will predrill the welded locknut before welding it on, hopefully set it up at SVA and drill the bolt in position through the nut.
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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Mark Allanson
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| posted on 14/4/04 at 08:56 PM |
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GGB, brilliant service, I ordered it by phone yetserday at 1:00pm, it arrived today at 9:30am in the post. It was £22 inc vat and postage.
Just a quick question, which is the inlet and outlet?
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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craig1410
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| posted on 14/4/04 at 09:26 PM |
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Mark,
If you look closely there is an arrow between the hydraulic unions. I presume this is the direction of fluid flow from master cylinder to rear
circuit.
On the price, I guess I was wrong about Brakepart being cheapest as they would have charged a whopping 27pence more at £22.27 inc vat and p&p.
Also great service and they even threw in a few bleed nipples for me at no extra charge as I forgot to order them at the time.
Cheers,
Craig.
[Edited on 14/4/2004 by craig1410]
[Edited on 14/4/2004 by craig1410]
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Mark Allanson
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| posted on 14/4/04 at 09:53 PM |
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That would be this one then!!
 
Rescued attachment BiasValve.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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