Repair the parallel V_brakes (M739, M950)

[Angyalpor]

Hi!

I've got a pair of M950 parallel brakes, but one piece of them is so dirty inside. Means, I clean them, but it does not move smoothly. If I fix them to the bike, they are perfect, but if I move them with my hand, then I can feel the problem.
I spray a lot WD-40 on it, move them continuously 15mins, and a lot oily sand comes out from them.
So, I think, it should be a better solution to take apart them, and clean them seriously.

How an I take apart them?
Or have somebody an illustration from them?

Thanks!

 

[FluffyChicken]

Re:

Undo the grub screw behind the brake bad holder and tap the pin out.

Then using 17mm cone spanner undo the nut at the end. 6 or 8mm Allen key (i foirget) in the back to keep it still .
Clean up the bearing / buy new parts as needed.


Stock it all back together a bit like doing cup/cone hubs.

 

[Angyalpor]

Thanks!

It's not too clear for the first sight, but I will try, and make pictures.
Now only the first two steps are clear.

 

[FluffyChicken]

Re:

There is a big topic on it somewhere. I think somebody added pictures and I have a load I took ready to make a wiki page on it.
I just cannot use the wiki as it's broken on me.

 

[FluffyChicken]

Re:

The black rubber caps hide everything.

 

[FluffyChicken]

Re:

Couldn't find ours quickly but here's the bit for the bearings.

http://forums.mtbr.com/brake-time/how-s ... 78033.html

It doesn't show that you can place a big Allen key in the rear of the boss hole if you want.

 

[Angyalpor]

Wow, thanks, that link is very useful!
And yep, the treasure is under the rubber covers.

Any idea to clean, repair the BR-M739? It hasn't got the rubber cover, I have no idea to clean or take apart it...

 

[letmetalktomark]

There is a big topic on it somewhere. I think somebody added pictures and I have a load I took ready to make a wiki page on it.
I just cannot use the wiki as it's broken on me.

Is this the one you meant?

http://www.trobike.co.uk/forum/viewtopi ... ilit=brake

 

[Angyalpor]

Oh, guys, thanks for Your helps!
And now I really know, what is the difference between the XT and XTR...

Pictures will come soon.

 

[MynameisCasper]

I've bookmarked this thread for future reference