mackei23b
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| posted on 2/7/08 at 08:03 PM |
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Front Brake Issues
OK, I’ve got a slight issue with the balance across the front axle.
I’m using the standard sierra front brakes and master cylinder, both front brakes share the same circuit and are independent of the rear.
When I went to the SVA I noticed that the brake efficiency was greater on the nearside front when compared to the offside front on the rollers, but
within tolerances to pass the brake test.
Now I’ve been driving the car, under heavy braking this shows as the nearside front will lock first, apply a little more pressure on the brake pedal
and the offside front will then lock.
When I built the car I rebuilt the callipers using new seals and new pistons, though I did notice that one piston was tighter to move than the other
(I may be answering my own question here?). However I also checked that the piston were moving freely when removed from the disc and all appeared
fine. Also both wheel move freely with no binding of the callipers.
I’ve re-bled the brakes and as expected no air in the line and no difference to the braking. I also swapped the pads over just in case they were not
well matched, but again no real difference.
So, the question, what am I missing that is causing this. The car has not been corner weighted yet, but I would have thought that this would not
account for the variance on the rollers at the SVA?
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bigrich
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| posted on 2/7/08 at 08:09 PM |
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your sat on the offside so increaseing the weight on that side . This makes it more difficult to lock.The balance at SVA may be down to the brakes not
being fully bedded in and not brakeing on the full pad/disc area.
[Edited on 2/7/08 by bigrich]
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A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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stuart_g
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| posted on 2/7/08 at 08:11 PM |
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Is there a big difference in the lengths of brake pipe to each brake caliper from the T piece?
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whitestu
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| posted on 2/7/08 at 08:12 PM |
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Interestingly I noticed tonight that mine does exactly the same.
The N/S front locks just before the O/S.
Stu
[Edited on 2/7/08 by whitestu]
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JohnN
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| posted on 2/7/08 at 08:38 PM |
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Front corner weights equal??
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froggy
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| posted on 2/7/08 at 08:44 PM |
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first thing check your front toe .i run 1 deg toe out for sprints but run a touch toe in for road use or it wanders a bit when braking hard with any
toe out up front
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britishtrident
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| posted on 3/7/08 at 07:48 AM |
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Don't get side tracked this braking issue is only down to corner weights .
All cars have corner weight issues because there is no such thing as a perfectly symmetrical car but it is much more noticeable on light stiffly
sprung cars.
Corner weight difference will show up in roller brake testing.
Either screw the spring platform up on the affected corner or down on the diagonally opposite corner.
Once you set the corner weights you might also want to look at the front-rear brake bias it could be you need a little more brake effort on the rear
end.
[Edited on 3/7/08 by britishtrident]
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britishtrident
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| posted on 3/7/08 at 07:55 AM |
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quote:
Originally posted by whitestu
Interestingly I noticed tonight that mine does exactly the same.
The N/S front locks just before the O/S.
Stu
[Edited on 2/7/08 by whitestu]
RHD drive car --- drivers weight is always on the offside.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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mackei23b
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| posted on 4/7/08 at 06:36 AM |
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Well as suggested, I've changed the front cornerweight on the front nearside and what a difference, brakes feel so much better.
Just need to get the car properly set up now.
Cheers for the input.
Ian
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