Hey everyone. My 1987 YFM100 has a rear drum brake with a cover. Looking at the repair manual and parts list, there are a couple of oil seals and o-rings which I've bought to replace the old. It also looks like a lot of mud has gotten into the brakes previously and were essentially seized up. After looking into it, there seems to be a hole in the bottom of my drum brake cover that appears to be part of the factory design. To me it seems counter intuitive to put in all these seals just to have a big hole in the bottom to let in who knows what.

I thought about plugging this up but was wondering what will happen to my brakes. The other option would be to just leave it like it is. Thoughts? See photos.

Many thanks!

 

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Ask the Editors: Holey Rear Drum Brake Cover - ATVConnection.com

 

Thanks for the response. I've opted for plugging the hole and making sure I've sealed the rear drum brake very well. When I get it up and running I'll test it out for a while and try to remember to remove the cover to verify how it holds up.