so, i'm buttoning up my ls swap on a 90 civic, and go to bleed the brakes. and everytime my buddy is pushing down on the pedal, i hear air blowing from someplace. upon further inspection, the air is blowing out of the throttle body. any ideas?

 

i dont see how it could be the brake booster.. could there be a vaccume leak, or a gasket where the tbody connects to the intake mani?

 

are you talkin bout a motor swap or a rear disc brakes? if disc brakes get a bigger booster! should also check you have the right prop vavle and brake master...

 

i dont think he is talking about a rear swap. he swapped the engine, and has air leaking out of the throttlebody so he says.. i dont see where the booster would cause that. the booster is mentioned cause when he trys to bleed the brakes the air leaks from the throttle body.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pepper &raquo;</TD></TR><TR><TD CLASS="quote">are you talkin bout a motor swap or a rear disc brakes? if disc brakes get a bigger booster! should also check you have the right prop vavle and brake master...</TD></TR></TABLE>

size of booster and having the right prop valve/mc has nothing to do with air coming out of the tb.

is the check valve working properly? maybe installed backwards?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eda6 &raquo;</TD></TR><TR><TD CLASS="quote">

is the check valve working properly? maybe installed backwards? </TD></TR></TABLE> Good thinking

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boston’s_rex &raquo;</TD></TR><TR><TD CLASS="quote"> Good thinking </TD></TR></TABLE>

no doubt

 

the check valve is correctly installed. it doesn't make a lick of sense why this is doing what it is doing.

 

bacause

 

bacause it is the only way the throttle body and booster are connected

 

figured it out. there was a bunch of air still in the lines. and when I did the swap I swapped out the stock brakes and spindles for ones off a 2000 civic. SOOOO the o.e. 1990 Master Cylinder doesn't have enough umph (bore) to adaquitly apply the brakes. at least thats what i think. i'll find out when i put a new one on.