Up until today I have been noticing that when I drive my car for awhile the brake pedal begins to lose pressure. Today I replaced my front rotors/pads and rear pads. I bled the system until there was no air bubbles but now I have shitty pedal pressure like the brakes are not grabbing soon enough or like there is too much free play. Add to this list I can now here a "psht" sound when I press the brake pedal. Ok, so is it the master cylinder, Booster or something else? I have no visible leaks...

 

Sounds like the booster if you are getting "leaking air" sounds when depressing the pedal.

 

This is weird though. I've been reading posts about these problems and ususally it goes like this:
excessive pedal travel- MC
No pedal travel(like a brick)- BB

It is a really quick PSHT when I jab the brake pedal. It doesn't hiss for as long as I hold the pedal. Could this just be a vaccum line?

 

In fact it sounds more like a squishing sound rather than "air"... I F****** hate Brake booster problems....

 

not to be a dick but is the resivor lid on and if it is is it on tight. i know the sound you are saying and when it happened to me i just forgot to replace the lid.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by folta2169 &raquo;</TD></TR><TR><TD CLASS="quote">not to be a dick but is the resivor lid on and if it is is it on tight. i know the sound you are saying and when it happened to me i just forgot to replace the lid.</TD></TR></TABLE>

Nope its tite

 

Pump the brakes several times with the car off and then hold the pedal for 15 sec. Does the pedal sink?

When the car is started does the pedal slightly sink to the floor?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eda6 &raquo;</TD></TR><TR><TD CLASS="quote">Pump the brakes several times with the car off and then hold the pedal for 15 sec. Does the pedal sink?

When the car is started does the pedal slightly sink to the floor?</TD></TR></TABLE>

I had forgotten about this method but I also forgot what this determines. If I pump and hold and pedal sinks what is it saying?

 

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

I had forgotten about this method but I also forgot what this determines. If I pump and hold and pedal sinks what is it saying? </TD></TR></TABLE>

faulty mc, wheel cylinder, or brake line.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eda6 &raquo;</TD></TR><TR><TD CLASS="quote">faulty mc, wheel cylinder, or brake line.</TD></TR></TABLE>
Wheel cylinder?

 

that's how mine acted when my mc went out. sound and all. replaced it in 45 minutes with some help.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr. carpenter &raquo;</TD></TR><TR><TD CLASS="quote">that's how mine acted when my mc went out. sound and all. replaced it in 45 minutes with some help.</TD></TR></TABLE> So you're saying that when your MC went bad you got that swish sound when you jabbed the brakes? I have a lifetime warranty at autozone on a MC from my old 90 CRX Si from a year or so ago I think I'm goin to try to replace that next. Hopefully this will solve my problem. Thanks for the info keep it comin' if anyone else wants to chime in...

 

yeah. it was'nt real loud but i could hear it.