1987 5ksq brake help

["J. Richards" <johndr@bellatlantic.net>]

I just picked up my car today from having a bunch of stuff done to get it
through MD. Inspection. It's the first time I have driven it since I started
work to restore it. The shop that did the inspection replaced the rear
rotors and calipers, head lamp switch, tie rod and some other misc. stuff.
I'm about 15 miles away in stop and go traffic and the brake pedal starts to
feel mushy. Next light it goes to the floor and the brake warning light
comes on and starts to buzz. I pull over and checked all wheels to see if I
could see any fluid, reservoir seems full and no smoke coming from any of
the wheels. I had a friend tow it home for me and have plans to check it out
tomorrow morning.
I'm betting that its the master cylinder. But I will check the lines and
calipers for leaks.
Does anyone have any other advise.
Johndr@bellatlantic.net
1987 5000ksq