Intermittent brake feel - sometimes firm, sometimes feels very soft

[c4koh]

Hi all,

Wonder if anyone can help (on my '92)

I am getting different feel in my brake pedal, and it the behavior is intermittent - happens when the car is cold, hot, just started etc.

I did get an ASR/ABS warning lights, and checked the codes - 83 low fluid, which I topped off to max. Fine. No other codes.

The brake pedal is sometimes firm (needs very little travel to engage the brakes - and feels confident), and sometimes it's very soft (needs a lot of travel to engage brakes, and does not feel confident). Can be soft from cold, soft when hot, hard when cold, hard when hot - no pattern to it that I can see.

If there were air in the system, I'd imagine the pedal would be spongy and soft all of the time - is that a correct assumption, or not? Or can the air move around so it can give different results.

There are no leaks that I can see anywhere.

Any help appreciated - I've read through the various posts as best as I could find, and have some ideas - but would appreciate any input.

Many thanks, folks.

Steve