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Discussion Starter #1
this is weird. the other day i was at a stop light and my foot was the brake (i have an automatic 95 se)and i barely let my foot off the brake and immediatley pressed on the brake again, and kept repeating this, without ever letting the brake pedal come all the way up to its original position. well, everytime i pressed on the brake pedal, it traveled further down until eventually it was to the floor! but if i let up on it all the way, it's fine. what's up with that?
 

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I've had the same problem here lately (I've got an auto RS)...but i dunno what is up with it...maybe i need to check brake fluid?
-Jon-
 

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Discussion Starter #3
my brake fluid is fine. and i thought if i had air in the system it would be soft all the time, but it only feels soft when i constantly press it over and over, it really gets tiring in stop and go driving.
 

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Oops I did a repost of the same topic without searching ..I have the save prob have a 95 RS cept mine only does that in hot weather ..at night or when it's a really cold day I have no prob..its been going on for about a year and I also think it's air in the breaks
 

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I have the same problem with my brake pedal going all the way to the floor when it is really hot outside or when I have the A/C on. My brake fluid is fine too. I think it may have something to do with too much vacuum, but on my gauge, it shows to be fine. I think I'll have my friend bleed the brakes & see if that may help.
 

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check your brake master cylinder and the vacuum in the brake booster.
 

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Yeah- it sounds like a vacuum problem or fluid bypassing the piston in the master cylinder.
 

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Ok so I'm a little lost ..what would be the solution to the vacuum problem or fluid bypassing the piston ..new manster cylinder?? This brake to the floor thing when it's hot is driving me nuts..
---Btw I would be really interested if someone could explain why it does this only when it's hot outside
 

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I don't thinkm you guys have to go that far. If you would just drain the system and fill it up with fresh brake fluid and bleed it. Then you should be fine.

Soft brake pedal just means that your brake fluid has moisture in there. Mines does this when its hot outside too. once its hot the brake fluid expands, just like everything else when it gets hot. So if it has moisture in there, the moisture (water vapor) expands also causing that soft pedal fell all the way down to the floor.

The reason why it works when you pump it is because you are pumping fluid to the system instead of just staying on it.

I got me a set of SS brake line and a set of speed bleeders and some new brake fluids to do my car.
 

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I had the brake system bled yesterday when I had my throwout bearing replaced ...still brakes slide to the floor when it's hot outside
 

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I had a similar problem in my 95 ls auto, to make a long story short, my problems went away when I replaced the master cylider, although I have heard that it could be the booster in some cases. Get it fixed not before you have an accident, at first it will be bad only on hot days etc, but eventually the problem will be all the time, and then on a hot day you will be trying to stop with little braking power and... you can guess. Just get it fixed now. I would try bleeding the lines first, if that doesn't fix the problem then I would take it to a brake specialist or replace the master cylinder.
 

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My friend has the same problem, and when it actually goes to the floor and you so happen to press it a little more further you can feel and hear some graunching/grinding/vibration. My friend has it confirmed that it is the VACUUM BRAKE BOOSTER. If any of you guys live in the bay area you can go to the parts house and get a rebuild for $229.00 with a $50.00 Core (i'm not so sure what the core is for? n e body help me out with that...plees). I also called the Stevens Creek Acura and another one in Los Gatos and they were selling the Vacuum Brake Booster for $539.00 and i'm not so sure if it will be coming with the 'CORE' or not? Well that's what my friend and i've been looking for, the cheapest price for them.
 

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Discussion Starter #16
thanks to everybody who replied, i replaced the master cylinder and the problem went away. i got the part at o'reilly auto parts for $70 + $35 core charge, changed it myself(the only hard part was bench bleeding the cylinder, which wasn't really that hard) i have brakes all the time, now, hot or cold (it was 100 degrees today)
and it's great, it's like i have a new car.
 
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