Rear brake failure. Oil ingress

[Bufficus]

I've been having trouble with my otherwise perfect working back brake due to oil ingress from the gear box. I've replaced the final drive oil seal 3 times (Rolf seals seated properly) which lasts a few miles until the oil comes through onto the shoes. The bearing is Casa Lambretta with no play. The problem started after I broke my Cyclone 5 speed for the first time. The casing was thoroughly cleaned but the bearing was never replaced. I guess the shrapnel has lunched the bearing/layshaft combo and this is the problem. Everything feels right and tight but I presume the filings have damaged the bearing.

I don't even know why I'm asking I've got to change them.

[Donnie]

Assuming it's not damaged the lay shaft itself hope it's just the bearing though.

[coaster]

If there is no play in the bearing I would think the area of the lay shaft were the seal contacts is damaged.

[Muppet]

chek y layshaft o'ring

[Minority]

chek y layshaft o'ring

MB agrees with you

[paulmgreen]

Replace o ring !

[Bufficus]

Thanks for the replies fellas.

I'll start with the 'O' ring and go through the process of elimination.

[paulmgreen]

Make sure you thoroughly clean the hub and casing with brake cleaner ... New pads too?

[Toddy]

Check the bearings not spinning in the casing I've had that before