tks
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| posted on 10/5/05 at 10:24 PM |
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did anyone measure there brake performance
Hi,
i measured my brake performance on an kind of rolling road..
and i came up with 1,5Kn front and rear
and 1Kn handbrake..
i have disc's allround (front new)
are these figures normal for a 2 M/C pedal settup??
its the weight of the front that when braking hard comes up the rolling road..
TKS
The above comments are always meant to be from the above persons perspective.
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Hellfire
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| posted on 11/5/05 at 12:24 AM |
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If that is the case... transfer of weight would soon see your back tyres skidding at those front to back levels being equal.... a definate SVA fail.
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NS Dev
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| posted on 11/5/05 at 09:05 AM |
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I would also be a bit worried that the handbrake is only 50% less effective than the footbrakes!!!
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MikeR
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| posted on 11/5/05 at 12:49 PM |
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shouldn't the handbrake be something like 20 - 25% of the main brakes.
(or was that what it was when i failed?)
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NS Dev
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| posted on 11/5/05 at 12:51 PM |
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I am not really sure but I know my car handbrake passes its last MOT but if you try and slow the car with it not a lot happens!
I think 25% min sounds about right, but 50% would suggest to me that the footbrake will be very poor!!!!!!
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britishtrident
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| posted on 11/5/05 at 02:02 PM |
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MOT requirement is the handbrake should be either capable of deccelerating the vehicle at 0.16g or locking the wheels, but an efficient handbrake
should give 25% or more on a Locost with drum brakes I would expect nearer 35%.
Your car is marginal on the handbrake -- which it shouldn't be as the calipers came from a much heavier car but should improve if he pads are
bedded in, also check the self adjuster is not strangled because the cable is too tight slacken back the cable a bit and allow the self adjuster to
work before retentioning the cable -- disc brake self adjuster usuall need about 7 clicks free movement at the hand brake lever or else the self
adjuster can't function.
Raw roller brake numbers are pretty meaning less as they don't take into account weight transfer, the Locost has roughly 50/50 static weight
distribution so on rollers I would expect both front and rear brakes to lockup the wheels giving the same reading -- however in a real emmergency
stop the rear brakes only are required to contribute between 30 and 33% of the braking effort.
Your foot brake should exceed stopping requirement without problem but I suspect the rear wheels will lock prematurely unless you set the bias towards
the front, the only way to do this is by road testing working up from a low speed test on dry surface. For SVA the front must definitely lock before
the rears. Start with bias set well towards the front and work towards the rear one turn at a time, when you find the optimum setting turn the bias
back 1 turn towards the front (2 to be sure for SVA).
If you find you have to turn the bias too far towards the rear cylinder using a larger master cylnder on the rear should allow the balance bar to be
recentred.
Also look up previous post on balance bar setup to see info on setting correct side clearance.
[Edited on 11/5/05 by britishtrident]
[Edited on 11/5/05 by britishtrident]
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tks
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| posted on 14/5/05 at 01:23 PM |
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mhhh
the problem is that
when i am touching the pedal with my feet
the machine is giveing some force in contra the wheel speed soow what happens at an certain point is that the cars locks and the hole cars goes up by
the wheel of the rolling road.....
the machine then detects it and stops...
i think if i put more weight in the front, it will automatically brake harder because the machine could lift me up with the wheel locked by the roll
but will need more force.....
for rear happens the same...
the handbrakes goes the same because i have rear disc its the reason they work so good.
what i didn't mention and also the situ is is that the discs are new and the pads to at the front..soow maybe there is a piece of performance
lose..
TKS
TKS
The above comments are always meant to be from the above persons perspective.
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NS Dev
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| posted on 15/5/05 at 07:56 AM |
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I know you have rear discs! So does my XR4x4 but the handbrake is not nearly as effective as the footbrake on the back wheels! The mechanical
advantage through the brake hydraulics is vastly more than through the little lever arm on the caliper!
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givemethebighammer
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| posted on 15/5/05 at 07:33 PM |
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I have rear discs on my Tiger. The handbrake was crap (new disks and pads) until I had put 50 or so miles on the car. On the way to my SVA I made sure
I braked hard several times (60mph to 20mph) allowing the brakes to cool between each attempt. This ensured that the pads were bedded in properly and
handbrake passed the test. I also use a fiat uno brake bias valve to stop the rears locking before the fronts.
worked for me
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