EasyJimbo
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| posted on 11/11/09 at 02:30 PM |
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Brake bias
Hi Guys
How do you manage to control the brake bias, is there some form of valve mechanism you can use to control this?
thanks
J
be gentle I am new to all this :-)
blog: http://mkjimbo-mkindybuild.blogspot.com/
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jack_t
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| posted on 11/11/09 at 02:45 PM |
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all depends on which system of master cylinder you use
1 sierra inline tandem has the standard bias built into it
2 twin master cylinders with equal bore and connected to the
pedal via a bias bar which has be be welded for iva
3 single large master cylinder or twin with fixed with a brake
bias bar and using a brake biasvalve
[Edited on 11/11/09 by jack_t]
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mistergrumpy
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| posted on 11/11/09 at 02:47 PM |
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There's a two or three of ways dependant on your set up. If you're using twin master cylinders (one for front, one for back) then you can
buy a bias bar which you can alter so that different pressure is applied to each cylinder.
If not then you can get an inline brake regulator, the Fiat Uno is mentioned a lot that restricts flow to the rear brakes or you can buy an adjustable
brake bias valve that doe the same as the last but is adjustable. The problem with this and the bias bar is that they have to be made non adjustable
for IVA so you have to make sure they are set up proprly first before they're fixed.
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MikeRJ
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| posted on 11/11/09 at 03:29 PM |
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Has anyone passed IVA with a bias bar set up? I though the IVA requirements for braking efficiency on a single circuit pretty much ruled them out?
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Canada EH!
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 posted on 11/11/09 at 03:32 PM |
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Or install the adjustable one after inspection, most competition cars have adjustable brake bias either through a pedal box with dual master
cylinders, or an inline unit to control rear braking only. The rear only one works well for race ending burnouts, or drag racing to warm the rear
tires before launch.
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r1_manx
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| posted on 11/11/09 at 04:33 PM |
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You could install the bias bar and pedal box and fit a locking kit from cbs:
http://www.cbsonline.co.uk/balance-bar-sva-locking-kit-balloc-1736-p.asp
It says they are SVA approved but not sure about IVA? It saves you having to weld the bias bar in place making it non-adjustable. I am running a
pedal box with twin cylinders (1 front/1 rear) and bias bar, and I will fit an in-line adjuster for the rear if I am struggling to ease of the rear
braking with the bias bar alone.
Ben
If im not in action, im in traction!
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MikeRJ
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| posted on 11/11/09 at 07:21 PM |
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Pinning the bias bars is not acceptable for the IVA, it has to be rendered completely incapable of being adjusted by running weld down the threads (or
as someone did on here, machining a bar with fixed bias just for the test).
[Edited on 11/11/09 by MikeRJ]
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