"Rich" <rgsrx@cox.net> wrote in message news:EA_ue.324$HV1.47@fed1read07...
> Four days ago I had my 1993 Accord serviced. Among other things, I had the
> brake fluid changed & the brakes inspected. The car has 149,000 miles on
> it, the front pads were replaced at 49,000 miles & the rear shoes are
> original. Anyway, I picked the car up on Monday & drove about 12 miles
> home & everything was fine. Friday I get back in the car for the first
> time & the brake pedal sinks to the floor. I check the brake fluid & it is
> full. I limp back to the mechanic(who I trust) who tells me the master
> cylinder just happened to go bad. He said the old fluid is thicker than
> new & that may be all the old MC needed to go. He replaced the MC &
> deducted the cost of the fluid change he had just done($247 - $75= $172
> for new MC installed).
> Anyone ever hear of new brake fluid pushing a 12 year old MC over the
> edge?
> Thanks,
> Rich

Nope, but a bleed done to full stroke certainly will.