Same thing happening with my Acura Vigor. It gets worse if I run the A/C, as
it probably heats things up much more in the engine bay. I will be changing
the master cylinder and the hoses also (as a precaution).

I would do the master cylinder myself, as it looks simple enough in the
helms book, but it's just too damn messy and I don't want to work in 90F
humid weather.

<subhamoy@gmail.com> wrote in message
news:1118426110.548008.230780@g47g2000cwa.googlegr oups.com...
> Hello all,
>
> Now that summer is here and temperatures are rising above 90 (in this
> part of Maryland), I have been noticing a peculiar problem with my '92
> Honda Accord. Especially on a hot day (though I am not sure about this
> correlation) after the car's been driven around for a bit, the brake
> pedals tend to get soft. Rather, at high speeds braking slows the car
> down. . . but the application of a persistent pressure causes the pedal
> to keep getting depressed without noticeable braking action. Pumping
> the brake resumes braking, and then it goes soft again until one
> releases and depresses the brake once more. The brake appears to work
> better during the initial braking action, and then gets soft after it
> has been depressed for a little while. There is no squealing,
> clinking, or any kind of noise or vibration.
>
> After reading these (very helpful) forums, I concluded that this may be
> due to water/gas contamination in my brake line, or a leaky master
> cylinder. I had the brake fluid flushed yesterday, and the entire
> brake system was checked out. There was no apparent leaks anywhere. .
> .and the brake fluid levels have always been constant. Today, I still
> find the same soft brake pedal problem.
>
> It is hard to get advice from car mechanics on this, because the
> problem is moody and sometimes difficult to reproduce. The car starts
> out fine in the morning. What do you guys suggest I do to fix this
> problem?
>
> Sincerely,
>
> Subhamoy.
>