i have been experiencing loss of brake pressure lately, you know, i got to pump my brakes at stop signs, that type of thing. so, i went ahead and replaced my back brake pads (front is good) and bled front and back. it is NOT leaking fluid but is losing pressure

 

could it be the master cylinder?

 

edited didnt read that your not looseing fluid durrrr yea i would try the master cyl first

 

but don't they usually lose fluid when they go out?

 

no, your cup seals are going out and there not holding pressure!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mini-me-power &raquo;</TD></TR><TR><TD CLASS="quote">no, your cup seals are going out and there not holding pressure!</TD></TR></TABLE>

Replace the master cyl....and look for vaccuum leaks on the booster. That is common as well.

 

yup change that master cylinder bro cuz once the brakes goes down we know its not ur brake booster

 

do you have drum brakes? Make sure you adjust the drum shoes properly. I had the same issue but it ended up just being maladjusted brake drums.

 

thanks ill try that... and yes i have rear drums ill be double checking that too

 

yes, im not the only one! ya it sucks sitting at a light and have to keep repumping brakes so the car won't roll. it's the master mine's shot too i just been broke lately so i haven't replaced it yet. did it on my friends eg it fixed the problem.

 

i just replaced the master cylinder, the power booster had a little brake fluid around it but the seal was good. there was more pedel travel but i wasn't losing pressure anymore. i bled my brakes, took it on a test drive, and there's a lot more pedel travel now. still holding pressure though.

 

any ideas?

 

if the brake pedal engages low try adjusting the rod lenth on the brake pedal. is it a stock master for that year and model you put it on? if it is try rebleeding the master there might of been some trapped air in it. did you bench bleed the master with fluid before you installed on the car?

 

i have 3 crx's and the all do the same thing. i put new brakes and lines and master cylinder and bleed them out. i just gave up. mine only happens once in a blue moon thou.

 

u forgot to bench bleed the master cylinder...no big deal. just bleed brakes again. i would try like 5 times at each corner. and if u had a vacuum leak at the booster it would not cause pedal travel....you would have manual brakes and would not be able to press down on the brake pedal and make it move more than a half inch if that. the booster asist in aplying pressure. so just bleed them real good...good luck man

 

you might wanna look up the bleeding sequence as well. Could be a Z bleed, or X, I forget.

 

its....rr,lr,rf,lf. basically the furthest from the master than next and so on.

 

i already have done all that. in sequence. and the master cylinder. like i said they are great again. perfect pressure. but theres just more play in the pedel before the breaks grab. no biggy.