Oil in brake hub

[Zombie Master]

They have Part # 3121233528 at my local dealer $40.

I guess I should investigate what Enigma found with his brake pivot pin.

Any tricks for isolating where it's coming from. It can sit dry for days.

Thank you!

[gspd]

Any tricks for isolating where it's coming from.

Remove the brake shoes and mist everything with baby powder.
The leak area should become apparent overnight, unless it only leaks when it's running.
Removing the drive from the swingarm and tilting it so the splines are facing downwards will exacerbate the leak.
There's a gasket (# 33 17 2 311 098) between the swingarm and the rear drive that will need renewing or resealing if it's disturbed.

[Zombie Master]

When I was getting oil in there it was coming through my brake pivot pin, or whatever it's called. It needed new O rings. Pretty easy fix as I remember.

Looking at where the drip shows up it looks like it may very well be coming out of the pivot pin. Was there anything tricky about removing the pin? the head of the pin has a very small depth to get a socket on.

[Kurt in S.A.]

Consider videos by Boxer2Valve:

https://www.youtube.com/watch?v=rkmZ6XH9nKY
https://www.youtube.com/watch?v=SdadynFQu50

Also search for Brook Reams.

Kurt

[Rob Frankham]

When I was getting oil in there it was coming through my brake pivot pin, or whatever it's called. It needed new O rings. Pretty easy fix as I remember.

Looking at where the drip shows up it looks like it may very well be coming out of the pivot pin. Was there anything tricky about removing the pin? the head of the pin has a very small depth to get a socket on.

I think there may be a confusion there between the brake cam shaft and the fixed pin. Correct me if I'm wrong but I think enigmaT120 is referring to the former while ZM is referring to the latter.

The brake cam should simply pull out of the casing once the brake arm and shoes are removed. The fixed pin should screw out of the casing.

If oil is coming from the fixed pin, that implies that the gasket between the main casing and the inner bearing carrier has failed since this gasket completely surrounds the hole the pin screws into.

Rob

[Zombie Master]

Consider videos by Boxer2Valve:

https://www.youtube.com/watch?v=rkmZ6XH9nKY
https://www.youtube.com/watch?v=SdadynFQu50

Also search for Brook Reams.

Kurt

These vids are for monoshock.

[Zombie Master]

When I was getting oil in there it was coming through my brake pivot pin, or whatever it's called. It needed new O rings. Pretty easy fix as I remember.

Looking at where the drip shows up it looks like it may very well be coming out of the pivot pin. Was there anything tricky about removing the pin? the head of the pin has a very small depth to get a socket on.

I think there may be a confusion there between the brake cam shaft and the fixed pin. Correct me if I'm wrong but I think enigmaT120 is referring to the former while ZM is referring to the latter.

The brake cam should simply pull out of the casing once the brake arm and shoes are removed. The fixed pin should screw out of the casing.

If oil is coming from the fixed pin, that implies that the gasket between the main casing and the inner bearing carrier has failed since this gasket completely surrounds the hole the pin screws into.

Rob

Thanx Rob! Much to consider. I've got baby powder sprayed on the situation. It may be the paper gasket. Looks like one bolt is seeping. I would imagine, if that is the case, I need to replace the gasket rather than trying to just tighten the bolt. These are the bolts behind the brake shoes, holding down the finned drive case cover.

[Zombie Master]

So observing the baby powder sprayed break hub; It looks like the oil is coming out of the shaft that spreads the brake shoes to engage the shoes against the hub.

I guess that would be some O ring(s) replacement.

So should I be looking out changing other seals if that is the only leak.

Still considering If I should replace the top hat shim to move the wheel with the narrower tires back to their original position.

So I have the original top hat shim......would that shimming have been done only on the right side of the wheel or could it have been on the left as well. Just need to know how many seals I will need.

Thank you!

[Rob Frankham]

So observing the baby powder sprayed break hub; It looks like the oil is coming out of the shaft that spreads the brake shoes to engage the shoes against the hub.

I guess that would be some O ring(s) replacement.

So should I be looking out changing other seals if that is the only leak.

Still considering If I should replace the top hat shim to move the wheel with the narrower tires back to their original position.

So I have the original top hat shim......would that shimming have been done only on the right side of the wheel or could it have been on the left as well. Just need to know how many seals I will need.

Thank you!

Just on the right side of the wheel. changinbg the top hat on the left side will have no effect on the position of the wheel.

Rob

[Zombie Master]

Thanx Rob!

It's really difficult for me to determine where the leak is. The only place I see oil dripping is coming out of the shaft that actuates the brake shoes. But it doesn't seem like the shaft should be exposed to oil. Can't find a picture of how that all works. If I take it apart, I guess I will have to replace the paper gasket, which will take some weeks to get. I'll keep at it.