macspeedy
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| posted on 17/5/03 at 07:01 PM |
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deceleration valve
On the sierra there is a valve/regulator thing which limits the brake preasure to try and stop the rear wheels locking, I'm reusing this and
need to know, which is the in end and out end?
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stephen_gusterson
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| posted on 17/5/03 at 08:48 PM |
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you need to know more than that.
the valve works on a little ball rolling to close the valve under decelleration. The mounting position and angle of the valve is essential to its
working.
Some people have used uno(?) and mini valves as alternatives.
some use nothing.
some use abs and a valve like me. (I mean I use both - im not a valve....)
you could look in a breakers and find the in and out....
atb
steve
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geoff shep
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| posted on 18/5/03 at 10:11 AM |
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Have you got a Haynes manual? its shown there. What age of Sierra?
Early ones have a cover plate with 3 bolts at front, later ones have a smaller diameter stepped end at the front.
Fluid goes in at the back and out at the front.
I have sierra system in a robin hood with discs front and drums rear and have removed the valve - the fronts still lock first.
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Peteff
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| posted on 18/5/03 at 10:13 AM |
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Bin it!. The valve has to be set at the angle it is in the saloon and depends on the dive in the suspension to increase the angle. Your car would be
scraping the floor at the front to make it work and the back would be six inch off it.
yours, Pete.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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macspeedy
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| posted on 18/5/03 at 11:41 AM |
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do i need the valve for the SVA?
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stephen_gusterson
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| posted on 18/5/03 at 07:23 PM |
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only if your car locks up at the back before the front.
there is no requirement for an actual valve - just that the fronts must lock before the rears.
some people dont fit one and get thro sva.
if your car has decent disks on the back it may not........
atb
steve
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macspeedy
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| posted on 18/5/03 at 08:11 PM |
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its got drums.
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Ian Pearson
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| posted on 18/5/03 at 11:37 PM |
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You can use an adjustable valve from a Fiat Uno, There is an in line pressure reducer on some Escorts. Not sure which model though.
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givemethebighammer
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| posted on 19/5/03 at 10:03 PM |
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You can buy the fiat uno item from a place in Bradford 01274 733727 (can't remember the name of the place) the cost about £15. They will do mail
order
see Bobs archive for photos. I'll take some pics of mine when it is finished.
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Danozeman
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| posted on 20/5/03 at 06:33 PM |
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Im not going to bother myself. If your rear drums are adjusted up properly they wont lock before the fronts.. Or the fit the other option of
adjustable bias type valve arrangement
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Dick Axtell
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| posted on 22/5/03 at 04:29 PM |
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quote:
Originally posted by Peteff
Bin it!.
Couldn't agree more!! I used to work on these things, & after much test work, we discovered that the valve closure point was wholly
unpredictable. If you hit the brake pedal swiftly enough, this valve can be beaten (i.e. pressure reaches the rear brakes before the valve closes).
If you really want details of this valve, check out the brake files on TOL.
LOL
Dick
Work-in-Progress: Changed to Zetec + T9. Still trying!!
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macspeedy
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| posted on 22/5/03 at 07:00 PM |
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Input
Thanks for all the input, I've decided not to fit it, but will keep it just in case.
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