9 replies to this topic

[Tomf]

Well im not going to have the space in the engine bay to keep my servo, so im going to have to convert back to the non servo system.

So i was hopeing that someone can tell me what i need to convert.

As i have the standard later servo, so i presume i have a split system, but i can always check that.

So can i get a non servo master cyliner that runs the split system? or will i need to change all the breaklines? Also im guessing i will need to change the rear wheel cylinders?

Any help on this would be greate.

[miniman andy]

im doing the same. im in the process of change it over and stick an ajustable brake biast thingy on and blead it all up see what happens.

i'll let you know the result.

[Tomf]

Cheers, what master cylinder are you using?

Also why do you need the adjustable bias?

[jayare]

You should be able to use this master cylinder. which was fitted to 1980-89 Minis - it a front/rear split like the servo one. I'm not sure if the bulkhead valve is the same and I have a feeling the brake pedal is different - check out the PDF's on the Somerford website to see if the part numbers are the same.

JR

[Asphalt]

Does you car have FAM7821 (pressure regulation valve)?
It was used from '78 'till '00 so most probably has if not removed.

So it should work with either servo or with GMC227 (split circuit master 1978->1989, pre servo) allone.
I'm not sure about the rear cylinders. Have a look what's used on 12" pre-servo cars ('84 - '89).

I had this setup runing with drums - worked fine.
Then switched to 'S' discs front and smaler rear cyls. (forgott which), still worked fine.
No I'm runing it with again smaler rear cylinders and 'S' servo to the front circuit. Very fine!

Hope this helps you

Regards,
Jan

Edited by Asphalt, 17 January 2009 - 11:21 PM.

[Tomf]

Cheers for the help from both of you, i think everything is clear now prety straight forward really, well it sounds that way, but knowing my luck something will turn out to cause me problems lol.

Yea im 99% sure i need to change the brake pedal aswell.

[Ethel]

The issue with the pedal is that the push rod is permanently attached (could be cut free) and there's no return spring as this is on the bell crank. I'm not sure that the bell crank spring isn't the same as the combined clutch 'n brake one used on the vertical cylinder setup.

[Dan]

There should be a return spring on the pedal as well as the return spring on the bell crank.

In theory all you need to do is drill the rivet out of the brake pedal to convert it into the earlier type but if you want to sell your servo, cylinder and pedal box then you'll be best off selling the pedal with it.

[Tomf]

Ah sounds good to me, so if i just drill out the rivet, i will be able to attatch the pedal to the master cylinder.

Will i have to weld any tabs to the pedal to attatch the springs?

Thanks for the advice.

[Ethel]

no, even if I'm right and there's no spring on the pedal it just fits by stripping the pedal box. Suppose you could fit a tension spring instead.