Master Cyl. reservior leaking...

[COBALT]

My master cylinder is leaking. It looks like I have brake fluid running down behind the reservior and proportioning valve all over the bottom of the brake booster (power brakes). Yesterday I smelled burning brake fluid, so it's getting on the exhaust manifold. I checked the reservior, and the rear one was empty! oops.

Pretty simple fix? My brakes need work anyway, so I figured I'd get in there and replace whatever I need to replace. I assume there's a gasket behind the reservior, and the fittings to the proportioning valve probably need to be looked at. I've never messed with these brakes besides new shoes, so any explanation as to what to expect would be helpful. The brake lines are old, but they're not leaking. New brake shoes and wheel cylinders and I think I'll be good to go.

Sound good?