"melbourne" <jjjjjj@hotmail.com> wrote in message news:<I2Eub.110$rG.3515@nnrp1.ozemail.com.au>...
> Vehicle: 1994 Civic with no ABS
>
> Problem: I am having a weird problem with my brakes. A few days ago, on a
> stinking hot day, I was at a set of traffic lights, when suddenly, my brake
> pedal began to slowly sink to the floor. The brakes worked fine and would
> stop the car, even under severe braking. The only problem would be that the
> brakes, when depressed would begin to sink to the floor after a few seconds.
>
> They were fine in the morning and fine in the evening. The only difference
> was that when I drove the car during the day, the weather was over 35
> degrees C. This problem occurred twice and each time it occurred, it was on
> a hot day. As the day became cooler or when the car is driven on a day
> below 35 degrees C, the brakes behave normally?
>
> Any ideas?


If the pedal sinks just a little (about an inch) I would not worry
about this - many cars do that to some degree. With the engine NOT
running, pump the brake pedal until you almost cannot push it down,
then with your foot firmly on the pedal start the engine - you will
feel it sinks a little bit. If it's sort of the same you had
experienced - forget about it.