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Master cylinder and disc brake conversions
https://www.ausmini.com/forums/viewtopic.php?f=2&t=62630		 Page 1 of 1
Author:  harry33 [ Thu Apr 22, 2010 9:56 pm ]
Post subject:  Master cylinder and disc brake conversions
Hi all,

I'm planning to do a 7.5" Cooper S disc brake conversion on my '76 Clubman. What changes to the hydraulic system should I make? I know I need to change the rear wheel cylinders, but I've read on other websites that the master cylinder and rear bias should be changed too.. What are people's opinions on this?

Cheers,
Harry
Author:  drmini in aust [ Thu Apr 22, 2010 10:08 pm ]
Post subject: 
On a `76 just change the rear wheel cylinders to 5/8" Cooper S ones, it'll be fine then. :wink:
The stock rear limiting valve is fine.
Author:  harry33 [ Thu Apr 22, 2010 10:18 pm ]
Post subject: 
Awesome, that's what I was hoping for :)

Thanks,
Harry
Author:  drmini in aust [ Thu Apr 22, 2010 10:38 pm ]
Post subject: 
You will need to redrill the backplates for the cylinder dowels, S ones are in the other end of the cylinder.
Author:  GT mowog [ Fri Apr 23, 2010 7:26 am ]
Post subject: 
This seems to be one of personal choice, but I'd also suggest fitting a booster.
Author:  66S [ Fri Apr 23, 2010 9:02 am ]
Post subject: 
Does anybody know what diameter the original Mk1 Cooper S rear cylinders were? There are no size references in the parts list but a few different numbers.

Regards
Al
Author:  GT mowog [ Fri Apr 23, 2010 1:02 pm ]
Post subject: 
66S wrote:
Does anybody know what diameter the original Mk1 Cooper S rear cylinders were? There are no size references in the parts list but a few different numbers.

Regards
Al


5/8"
Author:  66S [ Fri Apr 23, 2010 1:19 pm ]
Post subject: 
Thanks mate, I'll see what I have.

Al
Author:  drmini in aust [ Fri Apr 23, 2010 2:02 pm ]
Post subject: 
Yep the Cooper S and GT rears were all 5/8" out here, not sure about UK though.
Author:  66S [ Fri Apr 23, 2010 2:15 pm ]
Post subject: 
Doc, under very hard braking, the tail of the car gets quite unstable and tends to wag !! I was thinking that there might be a little bit too much rear braking but any ideas? I've never really struck this before but the brakes are standard Cooper S and in ggo condition all round, factory Lockheed servo too.

Al
Author:  GT mowog [ Fri Apr 23, 2010 2:46 pm ]
Post subject: 
66S wrote:
.... under very hard braking, the tail of the car gets quite unstable and tends to wag !! I was thinking that there might be a little bit too much rear braking but any ideas? I've never really struck this before but the brakes are standard Cooper S and in ggo condition all round, factory Lockheed servo too.

Al


Sounds like the Pressure Limiting Valve in the Rear Subframe is either the wrong one or siezed. Even with the wrong rear wheel cylinders do they do this.
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