I just put my 5 lug conversion on my 5th gen accord. I had drums b4 and converted to 4 wheel disk. I have bled all the lines with 0 bubbles, I JUST put a new honda master cylinder on it. it builds pressure until when i move the car. After i move it the brake pedal falls to the floor. what could be my problem?!?!

 

too much vacuum pressure. had that problem on an old bronco 2, sounds like it'd be the same thing. i'm not sure how to fix it... check all the hoses and make sure it's hooked up right. i had to plug the vacuum line from the power brake assist to a different spot on the motor. sorry if that doesn't help much

 

brake booster is to small

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by urbanlegend21 &raquo;</TD></TR><TR><TD CLASS="quote">brake booster is to small</TD></TR></TABLE>
sounds like a good possibility..

but rebleed your brakes.. if you have abs, some air gets trapped in there so when you bleed it a second time after driving it, you'll get some air bubbles out..

 

no i dont have abs. i could see if the brakes didnt stop hard enough because of a smaller brake booster... but its losing ALL pressure

 

I think you may have problems with the brake pump, the one that its btw the brake pedal and make the master cylinder works. I dont remember the exact name, but u should.

Does its sound like air coming out from somewhere when u brake?

from the inside, not outside, if u hear something like it, its 90% what i said...

ZERO