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Is my brake MC knackered?
https://www.ausmini.com/forums/viewtopic.php?f=2&t=13181		 Page 1 of 1
Author:  Si [ Tue Nov 15, 2005 10:08 pm ]
Post subject:  Is my brake MC knackered?
Hey there...

I'm in the middle of doing up my mini, and after bleeding the brakes several times, the pedal still feels spongy.

I've noticed that bubbles appear in the reservoir if i pump the pedal a couple of times. (i left it a day between noticing the bubbles and bleeding to get rid of them)
Image

Does the master cylinder need overhauling? if so, the master cylinder matches none of the pictures i've seen in books/on the web... which repair kit do i need?
Image
Author:  Harley [ Tue Nov 15, 2005 10:13 pm ]
Post subject: 
Hi Si, welcome to ausmini.

I can't tell from the photos if it is stuffed or not, but highly suggest either fitting a new
cylinder or reconditioned one. You don't want to finish the project and have
something go wrong later.
Author:  Stuwey [ Tue Nov 15, 2005 10:16 pm ]
Post subject: 
Looks like its been there a while, if the rust on the nut is any indication.

Have you checked for leaky wheel cylinders? They can let air back in, and as the master cylinder is at the top, thats where you will eventually see it. Check them, too.
Author:  Si [ Tue Nov 15, 2005 10:21 pm ]
Post subject: 
Stuwey_LS wrote:
Looks like its been there a while, if the rust on the nut is any indication.

Have you checked for leaky wheel cylinders? They can let air back in, and as the master cylinder is at the top, thats where you will eventually see it. Check them, too.


I've put a new set of wheel cylinders, hoses and a new pressure limiting valve. The rear pipes are fine, though i havent taken the front ones off to check them.


Thanks for the welcome, harley. my first post being a question feels a bit wrong, i feel i should have helped some other people first :)
Author:  Harley [ Tue Nov 15, 2005 10:25 pm ]
Post subject: 
Nah, we don't get too formal round here.
Just put a pic of your car in the gallery and you're in. :D
Author:  Stuwey [ Tue Nov 15, 2005 10:28 pm ]
Post subject: 
I'd be taking off the Master, and getting it Stainless Steel sleeved at the same time.

That way, it will never need to be rebuilt again. Well worth the hassle.

Just have 'fun' removing the pin from the MC under the dashboard :lol: One of the worst jobs on a Mini. Throw away the split pins, and put some 'R' clips back in. much easier. If you can, get a new clevice pin, too. This takes away much of the slop in the pedal-to-master. :wink:
Author:  aaron [ Wed Nov 16, 2005 4:33 am ]
Post subject: 
if you do decide to rekit the MC get a quite first and compare that with a new MC. could be cheaper.... businesses that sell are listed in the how to section :wink:

Cheers

Aaron
Author:  min13k [ Wed Nov 16, 2005 10:25 am ]
Post subject: 
Si could you also fill in your profile for the area your ie melb syd adel brisvagus
just makes it easier for us to help you
makka
Author:  cush [ Wed Nov 16, 2005 11:31 am ]
Post subject: 
Stuwey_LS wrote:
. If you can, get a new clevice pin, too. This takes away much of the slop in the pedal-to-master. :wink:


i need to do this at some point.... :cry: might just turn the car upside down so i don't need to work on my head. ;)
Author:  aaron [ Wed Nov 16, 2005 11:48 am ]
Post subject: 
clevis pins a 5 minute job. seat out long nose pliers, steady handy. done :wink:

Cheers

Aaron
Author:  gafmo [ Wed Nov 16, 2005 11:58 am ]
Post subject: 
additional to the Wheel Cylinders..that you have replaced a another place to check for leakage is on the Pedal..Some time if the the Master Cylinder is leaking it will run down the Brake pedal :wink:
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