soHybridized

i usually notice it when im running a/c and its really hot out. the brake pedal will fall slowly to the floor when im sitting at a light. if im on a slope i have to pump it back up to level but it still falls. what could this be?

i thought i might have air in the lines so i bled the brakes and i see no signs of leakage at the mc or booster. wtf is going on and why does it only happen in the heat of summer?

Street Ghost

Maybe brake fluid is bad?

Nextelbuddy

yea mine does the same thing. at night when it is cold pedal doesnt move anywhere even at a ligth i can keep ot floored and it does not go to the floor, but when its day time and hot outside my pedal will slowly go to the floor and then if i pump it back up sometimes it will saty up and not go back down ... weird only happens when it is hot outside

B18C5-EH2

Sounds like you guys need to buy a new brake master cylinder.

Nextelbuddy

maybe so thisis the 2nd remanufactured one i have gotten from autozone. i suppose i should just shell out extra money and go to acura and teh the OEM one

B18C5-EH2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NextelBuddy &raquo;</TD></TR><TR><TD CLASS="quote">maybe so thisis the 2nd remanufactured one i have gotten from autozone. i suppose i should just shell out extra money and go to acura and teh the OEM one</TD></TR></TABLE>

Do you have bigger brakes up front? If so I have a good part number for you to ask for at Honda.

BTW:

Don't ever put a larger m/c on your car with stock sized smaller Civic front brakes.

poison

Sounds like master cylinder. Easy fix..

The King

also check for leaking piston seals on the calipers the slowest non noticable leak can be there , ya never know

liam821

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C5-EH2 &raquo;</TD></TR><TR><TD CLASS="quote">Sounds like you guys need to buy a new brake master cylinder.</TD></TR></TABLE>

yeeeeeeepppppp!

Hatchy-Ownzjo0

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C5-EH2 &raquo;</TD></TR><TR><TD CLASS="quote">

Do you have bigger brakes up front? If so I have a good part number for you to ask for at Honda.

BTW:

Don't ever put a larger m/c on your car with stock sized smaller Civic front brakes.</TD></TR></TABLE>

I didnt know this.. I was gonna bend the lines on my GSR brake MC to put it on my hatch, but I only have the rear brake set up from my GSR on my hatch.. So I should stick with a regular civic hatch brake MC because I still have the stock civic front brakes?

soHybridized

is anyone able to tell me why this only happens when its hot outside?

Mike_C

Couldn't the brake booster also be leaking pressure?

Ricey McRicerton

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MichaelJComputer &raquo;</TD></TR><TR><TD CLASS="quote">Couldn't the brake booster also be leaking pressure?</TD></TR></TABLE>

<U>How to check brake booster</U>


Turn off car.
Depress pedal repeatedly until pedal becomes very firm/stiff.
Turn on car.
Depress pedal agian


If pedal stays stiff = brake booster is hosed
If pedal becomes softer = brake booster is good.

toolowsol

it only happens when it's hot outside because the brake fluid is hotter, and thinner, leaks by faster/easier.

Terminator Sol

mine did this the other day at a light and i tried to stop at the next light and the pedal went all the way to the floor. almost rear ended a trailer.

i dont know if this matters but the black paint is coming off my master cylinder. and im using synthetic blake fluid.

where can i buy a new master cylinder?