zxrlocost
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| posted on 25/4/06 at 01:27 PM |
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brake problem rears locking first
hi
I have the sierra cigar cylinder brand new
2 to the front 1 to rear
only prob is rear locks up first
anyone shed any light
I thought it worked straight out the box
all calipers are new sierra ones etc
ta chris
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greggors84
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| posted on 25/4/06 at 01:37 PM |
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Have you got discs on the rear?
Problem is the sierra has a lot more weight over the back end than a 7.
You will probably have to fit an adjustable brake bias valve, or you can get one from a fiesta that screws into the master cylinder, these are meant
to work well.
Chris
The Magnificent 7!
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jos
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| posted on 25/4/06 at 01:41 PM |
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The sierra uses a bias valve to ensure the rears dont lock up first
.: Motorsport / motor racing circuit / track wall art Apex Traxs :.
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zxrlocost
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| posted on 25/4/06 at 01:42 PM |
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so what shall I get
I have a tillet racing bar thingy will that do
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zxrlocost
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| posted on 25/4/06 at 01:45 PM |
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yes I have discs all round
we bled the system all worked perfect but now wev'e took it for a good run there was no air when we bled it but the brakes have just gone shite
now after a long run
all fluids are ok etc so I think ill rebleed them
ta chris
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greggors84
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| posted on 25/4/06 at 01:47 PM |
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Tillet racing bar? Is that an adjustable bias bar before the m/cs? if so you will need 2 m/cs one for the front one for the back.
Its prbobably easiest just to fit the fiesta bias valve, im tempted to take off my willwood bias valve and fit one as i have no way of easily pinning
it for SVA. Although someone told me the other day that is the bias valve is out of reach it doesnt need to be pinned. Mine is next to the diff so
should be fine.
Can anyone confirm this.
Chris
The Magnificent 7!
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zxrlocost
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| posted on 25/4/06 at 01:52 PM |
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yes its just an adjustable bar 1 in 1 out didnt realise I needed to have 2 M/C's
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James
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| posted on 25/4/06 at 02:44 PM |
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Fiat Uno bias valve.
Easy, light, 20 quid- sorted!
HTH,
James
------------------------------------------------------------------------------------------------------------
"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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zxrlocost
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| posted on 25/4/06 at 02:54 PM |
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ok cheers mate
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greggors84
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| posted on 25/4/06 at 03:20 PM |
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quote:
Originally posted by zxrlocost
yes its just an adjustable bar 1 in 1 out didnt realise I needed to have 2 M/C's
1 in 1 out? The ones ive seen are 1 in 2 out and you adjust the bar, this then distributes the pressure between the m/cs depending how you have
adjusted it.
Chris
The Magnificent 7!
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rayward
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| posted on 25/4/06 at 03:37 PM |
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one on ebay
link
thingy
Ray
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britishtrident
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| posted on 25/4/06 at 03:47 PM |
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Even simpler a Mondeo bias valve screwed into the master cylinder outlet --- easy to get off a scrapper --- cut the pipe and unscrew -- remember to
cut the pipe as you need the tube nut off it -- different thread.
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britishtrident
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| posted on 25/4/06 at 03:49 PM |
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quote:
Originally posted by rayward
one on ebay
link
thingy
Ray
no good for sva cause you can't lock it --
NTP thread fittings ?
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OX
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| posted on 25/4/06 at 04:44 PM |
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i didnt have to lock mine becouse he said it was out of the way.mine is above and to the right of the diff.
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Hellfire
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| posted on 25/4/06 at 05:07 PM |
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Are the brakes bedded in yet? Surely first questions first...
We have no brake bias valve, we never on our previous one either. No problem with rear lock-up's once bedded in.
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Jonte
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| posted on 25/4/06 at 07:33 PM |
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Gotta say the same. I have no brake bias on my Indy, but I got drums on the rear.
I do have a valve to the back brakes, but it´s fully open and have never been used.
Click it
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zxrlocost
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| posted on 25/4/06 at 08:41 PM |
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drove 70 miles today no change but will rebleed the brakes first as they got softer on the way back
ta for help
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OX
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| posted on 25/4/06 at 09:12 PM |
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i didnt use a bias valve in my first one but had to on this one when i changed to willwoods on the front.
chris,bleeding it should sort it out and you could also check that you back brakes arnt binding a little
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zxrlocost
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| posted on 26/4/06 at 10:17 AM |
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ok cheers
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Hellfire
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| posted on 26/4/06 at 11:42 AM |
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quote:
Originally posted by OX
i didnt use a bias valve in my first one but had to on this one when i changed to willwoods on the front.
OX, are you saying that with the Wilwood calipers on your rears locked up first, or was there just too much braking on the front?
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OX
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| posted on 26/4/06 at 04:43 PM |
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yip with the willwoods on the rears locked up first,if you use willwoods your best off going the twin master cylinder route.
the bias valve works but its just masked the problem,the brakes stop me but theres no feel to them.i have to put a lot of pressure on the pedal.
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zetec
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| posted on 26/4/06 at 09:43 PM |
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Just a thought as my rear disc set up does not need a bias valve...Is the Sierra M/cyl new or new old stock? If new old stock could be fitted with
20yr old seals.
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