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tegstar83
11-02-2005, 09:51 PM
Has Any1 had any problems on hot days with their brakes sinking down more than normal?? Also when sitting at the lights the pedals sinks more and dosnt hold the brakes. Is this some major problem? But It only happens on a hot day and works well any other time. Hope some1 can come up whith some ansers, cheers :confused:
joneblaze
11-02-2005, 10:00 PM
I also have this problem sometimes.

Might want to check your brake fluid/brake lines/master brake cylinder seal etc. :)
tegstar83
11-02-2005, 10:20 PM
yeah Ive checked it all no leaks or nuthin changed brake fluid and so on but it still happens. What was the problem whith urs??
spoondc2
11-02-2005, 10:33 PM
yeah Ive checked it all no leaks or nuthin changed brake fluid and so on but it still happens. What was the problem whith urs??

Sounds like BMC
Sp3rMz
11-02-2005, 10:47 PM
Bmc?
joneblaze
11-02-2005, 10:53 PM
Bmc?
Brake Master Cylinder.

Could be the BMC seal as well. I think if that's the case it will jus require replacement. Roughly $90-120.
tegstar83
11-02-2005, 11:17 PM
So y does it only do that in the heat???
one more chance
12-02-2005, 11:08 PM
sounds like u need new pads
ECU-MAN
13-02-2005, 12:01 AM
this is caused due to worn master cylinder piston seals, if you neede new pas your brakes would grind/squeel, if you had a leak you would run out of brake fluid and the pedal would become spongy.

to rectify, you can rebuild the master cylinder or get a new master cylinder and bleed the brakes.

this happens more on hot days because with more heat in the engine bay the master cylinder bore expands with more heat and the seals dont seal as well so you get bypass.
civiceg9
13-02-2005, 12:20 AM
I have the same problem with my old civic, sinks to the ground in summer + a/c on.
don't see any leaks but the brake fluid is black :D maybe is time I bleed it
Spongy pedal feel, I fix that with aftermarket pads instead of the OEM ones.
95_CVC
13-02-2005, 12:27 AM
If i'm at the lights and i have the brake pedal down, after about a few seconds the pedal drops down even further..is this the same thing?
ECU-MAN
13-02-2005, 12:28 AM
yes
95_CVC
13-02-2005, 12:30 AM
crap, so what do i do about it?
ECU-MAN
13-02-2005, 12:35 AM
to rectify, you can rebuild the master cylinder or get a new master cylinder and bleed the brakes.
joneblaze
13-02-2005, 10:26 AM
THanks for explaining John. :)

Damn, gotta fix mine too...so dodgy on those days back from the beach...
ECU-MAN
13-02-2005, 10:39 AM
no probs :)
tegstar83
15-02-2005, 01:26 PM
Come to think bout it I had the same problem in my old laser on hot days all It was was a 50cent seal I took out the shaft and replaced the seal and every thing went back to normal. I guess thats all I have to do.
Ill prob do it soon, If i had a digital camera available ill prob post a how to DIY on it.
civiceg9
15-02-2005, 02:36 PM
is it hard to change the MC seal?
tegstar83
15-02-2005, 03:16 PM
is it hard to change the MC seal?

From what I remember on the laser it was just two bolts then the shaft slid out then I put a new seal and put it back in then bled the brakes
ECU-MAN
15-02-2005, 07:08 PM
Honda is very similar, but instead you have to change the pistons as well, they come in a kit from Honda for around $80
tegstar83
19-02-2005, 06:10 PM
Honda is very similar, but instead you have to change the pistons as well, they come in a kit from Honda for around $80

What do u mean the piston??
Is that the shaft that goes into the MC??
Javed
20-02-2005, 02:06 PM
Yeh definately the BMC. Happened to me too.
Q_ball
20-02-2005, 02:12 PM
neva had that prob in my life!
ECU-MAN
20-02-2005, 03:04 PM
What do u mean the piston??
Is that the shaft that goes into the MC??

yes, the shafts have pistons on them with seals.