Master Cylinder reassembly

Post by **martylemoo** » Tue Dec 28, 2004 11:48 pm

hi,
could anyone tell me the order of reassembly for the master cylinder. I think it is this please tell me if i am wrong:-
small black rubber washer, rubber seal(i am removing to fit discs), spring(does the spring fit with the small or the large end first?), cup type seal, small gasket/washer, piston, seal and circlip. Am i missing anything here?
cheers
Martyn

Post by **Welung666** » Wed Dec 29, 2004 8:04 am

Hi Martyn

Hope this is of some help...

Lee

Post by **newagetraveller** » Wed Dec 29, 2004 12:20 pm

In order to fit the circlip:

Rotate master cylinder body through 90 degrees anticlockwise relative to the picture and secure it in a vice.

Insert all the other bits and pieces as in the picture including the Piston and Piston Stop (washer).
(NB the Secondary cup fits in a groove in the Piston.)

Use a large Phillips screwdriver to push the Piston into the cylinder with one hand. Use the other hand to fit the circlip, ideally using the correct tool.

Post by **Multiphonikks** » Wed Dec 29, 2004 2:35 pm

Out of interest folksies, how easy is it to check the state of a M/C? - After the ongoing saga with the brakes I'm thinking it may be worth removing the M/C (And yes, I know it's a pain to remove) and check the state of the bore before going the full hog and ordering a new one... (A complete new M/C that is - if the bore is fine then I could just renovate it...)

Post by **newagetraveller** » Wed Dec 29, 2004 7:13 pm

The brake fluid absorbs water after a time. This collects along the lowest side of the master cylinder causing it to rust at that point.

If you clean the inside of the M/C it is possible to see if this has happened either by running your finger along the inside of the bore where you would expect it to rust or by shining a light down it and doing a visual inspection.

It is also possible for the seals to perish and need replacing without the need to replace the M/C body iteself.

Post by **Cam** » Thu Dec 30, 2004 1:30 am

If you are going to the hassle of removing and re-fitting the M/C then I would just order a new one (if the old one's age is unknown) as it's only about £50 (or a bit less) and it's worth the peace of mind to replace it with new.

I would not consider fitting a new seal kit to the Minor M/C either as it's just penny pinching. I did to my MG though, but that's because the bore was good (just a split seal) and a new M/C was over £250!

Post by **Multiphonikks** » Thu Dec 30, 2004 9:12 am

Thanks guys...

Am contemplating buying the whole shebang as the last time I cut corners I ended up regretting it...