B18C5er

This problem is a come and go kinda thing. Once in a blue moon when i'm braking, the pedal travels all the way to the floor. The braking would start off really firm, then as the car is slowing, the pedal slowly travels all the way down while still maintaining the same brake pressure.

I have no idea what causes this. It only does it once in a blue moon and lasts several hours. For instance, today I went to get my AC recharged and it was fine. On my way home I noticed the problem occuring. It lasted all the times I used my car throughout the day until around 8:00 pm.

Anybody have any thoughts on what it could be?

ThanX.

sohcnotec

Sounds like you may be needing a master cyl real soon.
Also check to make sure there are no visible leaks as well and that the fluid level is okay as well.

B18C5er

fluid is fine. I checked that already. I was thinking maybe a vaccuum problem? But I can't understand why it isn't a constant problem. The Common Denominator i believe is really really hot days.

civicnation

brake booster or master cylinder

civicnation

try taking it to a shop to get a diagnostic performed.

imported_SaYjAiBaO

well if you pump it and there's pressure then it's not your booster. i just had this problem on my dad's car last week. turns out that it was a seal gone bad in the master cylinder and it was leaking on the inside. everything looked ok until we took it apart. your best bet would just to goto a junkyard and find another one. i got mine for 50 bucks and 80 bucks labour to change it and do a complete flush.

imported_phuviano

yep... sounds like the MC.

bbarbulo

iTrader: (2)

master cyl. i just changed mine for the same reason on my beater

B18C5er

Interesting. Thanks a lot guys.

One more question though. Why isn't the problem constant? It happens very rarely.

imported_SaYjAiBaO

well yours is probably not that bad yet. still go replace it asap.

bbarbulo

iTrader: (2)

I found my got worse the hotter the weather got. So yours is prolly not that bad yet, and if you wait till winter it prolly won't happen at all. however, all the while, brake fluid is leaking slightly into your booster and destroying it from the inside out. It's just the way parts interact when they expand in the heat and whatnot.... that's prolly why it's not consistent.

B18C5er

So what exactly goes wrong with the master cylinder? I don't really notice a decrease in brake fluid.

Thanks.