Late Model(post 88) Brake Servo

Started by tmsmini, December 01, 2022, 09:04:02 AM

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Any one have a link to rebuild directions for the latest style servo?
Or hints and suggestions?

There are more parts supplied than I was expecting:

In the past I have just carefully documented everything with the direction of the seals for master cylinders, but there are diagrams to check against.
I have not found a diagram for this servo.


Are you talking about rebuilding the servo itself, or both it and the master?

Aren't complete new servos about $200?

The servo itself is pretty easy, just two halves of the can that twist apart and a big rubber diaphragm inside. Use plenty of rubber grease putting it back looks like the kit you linked has a sachet of rubber grease in it.

The master cylinder shouldn't be any big deal either, if you've done one, you've done this one.

I did the one on my Jag years ago and I don't remember it being any big deal, but the one on the Inno was badly corroded so I bought a new one. I think the hardest part will be separating the two halves of the can. It's been a long time but I think all I did was use a bar across the MC studs with the other end clamped in my vise to hold it.
Complete failure at retirement

1989 Cooper Racing Green
2009 Clubman S
2014 Audi Allroad


I replaced that type of servo on my car about 5 years ago after the check valve and/or bladder failed and the carb sucked in a lot of brake fluid.  Decided to spring for the entirely new servo (figured it was only about $100 more than a rebuild kit) for piece of mind and simplicity. 
1988 Austin Mini
2002 MINI Cooper S
1992 Toyota LiteAce (JDM)
1997 Jeep Wrangler Sahara


Looks like it is still only $100 more than the rebuild kit. I was expecting the rubber diaphragm, but there is a plunger with seals as well.
I bought a new master cylinder, should have gone for the servo as well.

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