1988 blazer ' going back and fort in 4wd to flaten out snow . put back to 2wd drove forward and when i applied brakes pedal went down more than normal. looked under rear wheels and on passenger side there is i suppose brake fluid leaking down axle housing and onto tire . could this be rear brake cylinder seals leaking ?

 

Its quite possible. You'll need to get the wheel & drum off to confirm.

 

thank's for reply. the brake line going into the rear plate has 3 small holes in it. i'm replacing both left and right rear lines. thank"s again i'll be closing this post now.