I have a 1985 honda 250sx and the rear brake drum gets water and dirt inside.
it rotted the bottom brake shoe off!! what should i do???

 

i can tell you what helped me out when i did the rear drum on my foreman. water and mud kept getting in and completly saturated my break shoes!

put new shoes on, buy a new seal and when you place the drum case on put silicone or dielectric grease on the seal and both drum sides. i used dielectric grease on mine and have not since had a problem with water in my drum. (i submerge mine regularly!)

you must make sure that the mateing surfaces of your drum halves are not dented and will provide a close seal.

hope this helps

 

replace yur seals man!!