11 replies to this topic

[jonti1275]

Hi, I have a brake fluid leak but cannot find out whrer it is going. I had checked the front and rear brakes and all it fine and dry, I have checked all the pipes and these are fine. I have checked under the bonnet and threr are no leaks tho be found?.

I had left the car stored over the winter but went to take it out and found the fluid res bone dry?. So i checked under and around the car before moving it and there is no evidence of fluid any where.

Is it possible the master cylinder is filling up the servo? (green tag master cylinder)The servo has rust on it below the mou nting point of the master cylinder.

Has anyone else suffered the same problem? Can anyone help please? Any thoughts?

All advice greatfully received.

My car is a 2000 cooper sport mpi standard brake system

Cheers.

[cambiker71]

If there's definitely no external leaks then i'd suspect the master cylinder as you suggest, out of interest did you check the level before parking it up? My thoughts are it may have been leaking somewhere leaving the level low. Have you had the rear drums off to check inside? If not then try that before spending any money.

[jonti1275]

I have had the drums off they are fine all dry and pistons are ok.

When the car was put away it was had fluid in. but the resvoir is now totally empty. I checked it about 5 weeks ago and it had gone down a little.

I can't think it would go anywhere else. I have not removed the master cylinder yet thats where i will go next i think.

[Jay3178]

mate of mine was loosing brake fluid through the vacume pipe on the inlet manifold, the seal in the servo had deterioated and the vacum from the engine gradualy just sucked it dry. the fluid did make it smoke a tad which gave it away a little this was from a 1998 cooper, so may be worth checking the vacume pipe on the inlet manifold

[jonti1275]

I have removed the master cylinder and found a resevoir of fluid in the front of the servo!

And yes it was just about sucking it throught the pipe aswell.

Thing i brought a seal kit for the cylinder and the end seal and circlip don d'not fit as it has a three pronged round clip instead of the last seal and circlip?.

Is this right or where they changed late on in life. The seal kit i brought is the right one.even the haynes manual shows the haynes manual shows the seal and circlip?.

Has anyone else come across a different arrangment

[stevede]

Did mine last night.

I have the green tag master clyinder and used the GRK1032 kit bought from Mini Sport.

Everything fitted a treat.

I had to remove the springs & metal clips to get the seals on.

The rear most seal was a pain as you have to compress 2 springs before pushing in the 2 rear most seals before the circlip.

Not sure if we're on the same part, but mine had a plastic tabbed washer type part in between the 2 largest rear seals.

Have you a picture of the parts you have (new & old)

Let me know if I can assist

Cheers

Steve


Steve

[jonti1275]

I had a look at a new one today and it is the same as mine, so at some point rover did away with the last seal and washer and circlip.

This means the service kit is not strictly correct but i will fit the cylinder and see what happens.


This is a view of the cylinder nylon seal  IMG_2262.JPG   80.9K   9 downloads

Edited by jonti1275, 09 March 2010 - 08:20 PM.

[stevede]

Mine had a similar but lower profile plastic washer in between the 2 large seals that go at the rear. Then a metal washer and finally the circlip.

When you look at the back of mine, you just see the circlip & washer.

[rolf]

I had a look at a new one today and it is the same as mine, so at some point rover did away with the last seal and washer and circlip.

This means the service kit is not strictly correct but i will fit the cylinder and see what happens.


This is a view of the cylinder nylon seal  IMG_2262.JPG   80.9K   9 downloads

I have the same exactly.
How do I open this without making any damage to the seal?

[Ipod]

Edited by Ipod, 10 February 2013 - 10:12 PM.

[rolf]

Haha!
You may have not answered to my question, but you made me laugh.
Thats something!

[rolf]

by the way, you look good in the picture!