82 loosing Brake Fluid

[jeanie2002]

I have an '82 that keeps loosing brake fluid in the mst.cyl. rear reservoir closet to fire wall. Got under car and can't find a wet spot anywhere. all calipers seem to be dry. On other cars I have had it leak out the back of mst.cyl. itself but usually has a trail of fluid down the booster this does not, i have not pulled mst.cyl away from booster yet because as much fluid as i have lost there should be something wet, No obvious wet spot anywhere. Any Ideas?????

 

[Vettehead Mikey]

Ah yes, looking for and avoiding the wet spot is a lifelong occupation it seems. On C3 Corvettes, a rear M/C seal leak usually just fills the booster with no external leaks. Start there.

 

[jeanie2002]

Found leak

I pulled the master cyl forward and bone dry, so I knew it had to be else where. I pulled wheels and found it easily on left rear, when I checked before from under car i could not find but after removing wheel there it is>>>>> pistons leaking on outboard side so only visable once wheel off. Got kit $14 and resealed. Those pistons really get nasty, probably should have got kit with new ones. Read about everyone swithing to O ring kits now instead of lip seal, sounds good and very reasonable on ebay. next time. Kit fairly simple to install however bolts where tough because of rust. thanks

Ah yes, looking for and avoiding the wet spot is a lifelong occupation it seems. On C3 Corvettes, a rear M/C seal leak usually just fills the booster with no external leaks. Start there.