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Servo brakes

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#1 marc


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Posted 24 January 2005 - 08:53 PM

I have non servo drum brakes on my 1980 clubman, i was wondering wether later model servo/master cylinders assembilies can be made to fit my clubby?

I'm a mechanic by trade and experianced in fabricating/welding so any modifications could be done by myself, is it a straightforward swap or does the bulkhead need modifying?

I want to do this now as a disc conversion and more power should be coming my way in the future

Thanx marc

#2 Jordie


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Posted 24 January 2005 - 09:12 PM

I have a 1980 mini saloon and dont see the need for a servo (having just changed from drums to 8.4" discs myself).

#3 siggy


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Posted 24 January 2005 - 09:19 PM

Don't run drum brakes and a servo. they will be far too sharp and grab.


#4 Dan


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Posted 24 January 2005 - 09:21 PM

Yes it can as the bulkhead is basically unchanged. You need to use the additional pedal box which supports the servo and its bellcrank, and you need the late brake pedal as pre servo one isn't compatible.
You also need to fabricate a mounting on the bulkhead for the top of the secondary pedal box, this is just a 3/8" ish screw through the panel needing a nut but the late bulkhead does have some stiffening in this area for the mounting so a load spreading plate might be a good idea. You might also need to slightly reshape the bulkhead below this mounting to get the servo and MC to sit at a nice angle, but it won't need much more than a small dent.
Don't do this 'till you are fitting the discs though as the new MC will provide far to much fluid for drums and your pressure distribution will be screwed up.

#5 joe90gt


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Posted 25 January 2005 - 06:26 AM

I'd do the disc conversion first then you wouldnt need the servo (for 8.4 discs), otherwise an easier way is to fit a remote servo (about £130) a la 7.5 disc versions

#6 Dan


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Posted 25 January 2005 - 01:41 PM

DO NOT fit a single line remote servo to a dual circuit brake system. They were fitted as standard to single circuit braked cars only, you really don't want servo assistance on the front wheels only. Fitting the direct servo MC is easy, and very worthwhile. Use flexible lines to connect it to the bulkhead valve though rather than the solid lines as it makes servicing a great deal easier. Specially designed sets are available from HEL or Minispares.

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