saigonij
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| posted on 1/5/05 at 12:13 PM |
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First Run but rears locking up before the fronts
We took the velocity out on its first run yesterday - just up and down a private road with me hanging on to the battery.
One thing we noticed is that the rear wheels locked up long before the fronts locked up, which is NOT good.
We are using sierra read discs and calipers, front sierra ( 260 ) discs and calipers and the two master cylinders supplied in the Gold Pedal package
from Luego.
I cant remember the sizes, but they are something like 0.7 and 0.625 or something like that.
Can anyone tell me
1) which m/c should be used for fronts and backs
2) why my backs are locking before the fronts
3) can the luego pedal box with its balance bar be set up to prevent this? There were no instructions.
Thanks,
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APR
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| posted on 1/5/05 at 01:57 PM |
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fully ajust the bias bar to the right and leave gaps between the nuts and push bars so it can pivot
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coovey
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| posted on 1/5/05 at 03:35 PM |
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All the instructions are in their build manual it tells you which is which. Not sure if it details which way to move the bias bar but it may be a case
of trial and error.
If you haven't got their build manual it's available off their website.
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Donners90
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| posted on 1/5/05 at 06:39 PM |
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Bleeding with Bias Bar
I'm having the same problem too. Just curious, but should you bleed the brakes before or after you've set up the bias bar? Does it make a
difference?
Cheers
James
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shaywez
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| posted on 1/5/05 at 07:12 PM |
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Set up the bias bar and then bleed the brakes. Also bare in mind that once the SVA inspector has satisfied himself the bias is set correctly tou will
need to drill and pin them!!
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Wadders
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| posted on 1/5/05 at 07:58 PM |
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With discs on the rear you may run out of bias bar adjustment, and still be locking the rears first.
i fitted a fiat uno bias valve in the rear line, instant cure.
Al
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Hellfire
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| posted on 1/5/05 at 11:55 PM |
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I know it is of no consequence but we have no bias valve and ours performed ( ) very adequately. We have standard XR4i disc brakes all round (with
ABS removed - obviously!)
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saigonij
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| posted on 2/5/05 at 08:47 AM |
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We have DOHC sierra brakes all round, so thats
Fronts : 260mm dicsc with 60mm piston calipers
Rears : 253mm discs with 43mm piston calipers
Im sure we have the 0.625 fitted to the front circuit, and the 0.7 fitted for the rears, but this still does not make sense to me.
As well as pressure, is there not a certain amount of fluid that has to be moved in order to apply force on the caliper piston, and hence on the
pads?
If the rears have smaller caliper pistons than the fronts, but a larger bore m/c, does this not mean that they will be "fully primed and
read" way before the 60mm pistsons on the front?
I was also wondering if it was a goot idea to run a deceleration valve from a sierra to stop the rears locking up.
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