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Fitting 8.4s Rear And Cooper S Drums In The Back


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#1 shashora

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Posted 17 March 2008 - 02:00 PM

I am reading up and searching,
some people say that they are fine without fitting a bias valve where some people say that it is needed. I know that when i fit 8.4 inch disc brakes and have rear drums on the back the weiight and power will change. There fore i need to change pressure going to the drums and fronts which must be done through a bias valve?? I think

Althoguh reading this article on minispares they say ..

" Throughout mini history there has been no less than five different wheel-cylinder bore sizes used. All of which will fit any brake back-plate with relative ease, i.e. may need to drill the locating-pin hole on the other side. GWC1101 has a 0.625"(15.88mm) bore, GWC1102 a 0.750"(19.0mm) one, GWC1126 a 0.500"(12.7mm) one, GWC1129 a 0.6875"(17.46mm) one and GWC1131 a 0.5625"(14.29mm) one. Quite a selection as stated, but confusion is added by the use of pressure regulators/distributors. Some of which don't do any regulating of the pressure at all.

There are too many variables including all-up car weight, front/rear weight split, tyre size and type, front brake choice, etc., to make an exact and correct list. As a guide to start with, working suggestions I have used with reasonable success can be generally channeled into a few groups -

*Discs with 4-pots and latest built-in servo and 7.5" discs with S-type servo, use GWC1131.

*8.4" discs with or without servo, use GWC1126.

The above is presupposing NO regulator valve is used in the rear feed line as they really complicate matters, and is irrespective of master cylinder bore size - assuming a standard Mini fitment one of some type is used. I re-iterate - it's a working start. "

So im wondering if i need to use a bias valve.

Please help me out ;)

Also if i do need to fit the bias valve is this the one i need
http://www.minispare...spx?pid=38406???

Cheers adam
;D :D :genius:

#2 [email protected]

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Posted 17 March 2008 - 03:46 PM

In order to answer this question fully, we need to know what braking system you have on the car at the moment? Asssuming drum brakes, but is it single line?

#3 shashora

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Posted 17 March 2008 - 10:27 PM

How do i tell this?
I only have one brake line and one line running from the master cylinder..
Is this how i know?
Cheers adam

#4 shashora

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Posted 18 March 2008 - 10:58 AM

Bumpity!

#5 [email protected]

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Posted 18 March 2008 - 12:23 PM

Yes, so sounds like single line, in which case on your rear subframe will/should already have a proportioning valve.
What year was the car manufactured? Again, as with the door seals this is no hard and fast rule, you might be better checking with Minisport Australia for what is fitted to you car (www.minisport.com.au) as the Aussie cars had their own production line and year change points, so the info I am able to give maybe wrong.
Basically change what is on there like for like, do not mix up bore size wheel cylinders, as this will throw the balance out. You can either measure your bore and match them, or speak to one of the specialists in Australia to see what should be fitted.

Edited by [email protected], 18 March 2008 - 12:25 PM.


#6 shashora

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Posted 18 March 2008 - 01:33 PM

ok cheers mate!




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