Hello all,---I was helping a friend check out his brakes and I found the
following situation.------Sometimes the pedal is firm and sometimes it goes to
the floor, but the second push always get a hard pedal again. I can not figure
out why it would work one time and not the next. If I push very slowly on
the pedal and take about a minute to push it down with very light presure , it
always goes to the floor. If I push hard, it usually is firm.It is a '80 MGB
but brakes are brakes Actually, the same situation occurred with my Volvo
and waiting at a red light I discovered the same situation which leads me to
think it is the master cylinder. What do you folks think? Bob C
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