bodger
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| posted on 16/3/07 at 09:55 AM |
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SVA & brake proportioning valve
Any SVA issues with fitting a proportioning valve for the rear brakes. Is it OK for it to be adjustable from the driving position? I'm thinking
of fitting it on the tunnel forward of the gear lever.
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Mr Whippy
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| posted on 16/3/07 at 09:58 AM |
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from what I have been told it should not be adjustable whilst driving for the SVA
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bodger
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| posted on 16/3/07 at 10:00 AM |
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I had a feeling that might be the case.
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zxrlocost
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| posted on 16/3/07 at 10:02 AM |
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if you use sierra brakes and a sierra MC you shouldnt need one
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russbost
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| posted on 16/3/07 at 10:05 AM |
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If you fit one it needs to be PERMANENTLY locked ie split pin or similar for SVA.
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Don't forget Stainless Steel Braided brake hoses, made to your exact requirements in any of around 16 colours.
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shortie
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| posted on 16/3/07 at 10:13 AM |
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I have one but you won't need it if you use the Sierra M/C, I had it fitted for SVA but it was hidden in the tunnel, as mentioned if it is
visible then it must bet locked in position, best thing I would say is not to bother.
Rich.
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Mr Whippy
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| posted on 16/3/07 at 10:14 AM |
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sorry but what is it about the sierra m/c that is different?
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bodger
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| posted on 16/3/07 at 10:25 AM |
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I'm switching to discs at the back from a drum setup & still keeping the original master cylinder. I thought it would be a good way of
making sure the backend doesn't lock up first.
However I might bin the idea for now then & think about it again after SVA.
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zxrlocost
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| posted on 16/3/07 at 10:27 AM |
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I had sierra discs all round and a Sierra MC I passed my SVA fine
the sierra MC I believe already sends the correct pressure to front and back
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bodger
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| posted on 16/3/07 at 10:38 AM |
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thanks.
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Kev99
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| posted on 16/3/07 at 10:43 AM |
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If using discs u will need one
I used one from a fi at uno and made a bracket and screw up to adjust it,
Tried it fully open (no screw) at sva and it failed
So set adjuster up there (same test) and covered it with araldite there then. They passed it ok as it was not adjustable
Used standard Sierra MC
Hope this helps
[Edited on 16/3/07 by Kev99]
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zxrlocost
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| posted on 16/3/07 at 11:01 AM |
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I would just like to confirm I passed my save with standard xr4x4 discs all round
plus cheapo pads and a sierra MC
if you use aftermarket and calipers you may need one but
PS I also had vented discs but this wouldnt make that much of a difference
NO Brake valve needed
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nick205
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| posted on 16/3/07 at 11:59 AM |
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I fitted a valave from an Uno to my standard Sierra braking system (rear drums) during the build to save having to install one afterwards if I ended
up needing one. Mine's fitted in the engine bay above the m/c using a bracket with a screw and lock nut to provide adjustment.
I used the adjustment to tune the set-up and get the brake balance right, then tacked the locknut to the bracket with a tiny weld so it was locked.
SVA man was perfectly happy, but did comment that it would have failed without the weld or something similar in place to lock it.
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Bob C
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| posted on 16/3/07 at 01:10 PM |
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I used the wilwood valve. It had to be pop riveted to be unadjustable at SVA.
A properly designed prop valve setup will give optimum braking over a wide range of conditions unlike a bias bar which is only optimal for 1.
Here's a link to a spreadsheet I used to design my setup - you can see how the brake force distribution automatically tracks the weight
transfer.
There's no doubt that you will pass SVA with stock kit so long as it puts most brake force on the front. Equally there's no doubt in my
mind thet a system which performs better in slippery conditions will be safer!!!
cheers
Bob
http://freespace.virgin.net/bob.carter/files/brakecalc.xls
edited because I was barking optimally ;^)
[Edited on 16/3/07 by Bob C]
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JAG
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| posted on 16/3/07 at 01:22 PM |
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Another vote for the "You don't need one camp"
SVA is the best place to find out. Virtually no-one passes first time and if it fails because of this then it's a very simple fix.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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Dusty
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| posted on 16/3/07 at 03:45 PM |
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Taunton and Exeter SVA centers interpret the regs different from the above. You can have an adjustable valve but the brake test will then be done
twice, once with the valve adjusted to one extreme and again with it to the other extreme. Which means you will probably fail if the valve works!
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Bob C
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| posted on 16/3/07 at 05:15 PM |
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Definately - that's why I had to rivet the valve into position once set.
Bob
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