WAS: 05 Elantra GT Rear Disk Brakes Question

I said I'd come back with an update, so here goes.
I brought the 05 in again yesterday. They did extensive testing and
decided it needs a master cylinder (which is what I thought all
along). Unfortunately it was late in the day and they could not fix it
yesterday as they did not have the part there. I am bringing it in
Monday to replace the master cylinder. They "may" be able to give me a
loaner car for the day. Funny thing is, they own a Chevy delaership
also. They have two loaner cars from the Chevy dealership. Both cars
are Fords! I found that kind of funny. The service manager has been
very good about the whiole thing. I believe it was a case of a bad or
just lazy employee originally.
ALSO, I bought a new 07 Elantra SE on Wednesday. I have not had time
to put it through it's paces, I think I still like the 03 the best of
the bunch. I looked at other cars, but when it came down to it, the
Hyundai was still the best value out there all things considered.
Thanks all...I'll let you know the final outcome next week!