Omg....need Help.
 

First my brakes a sort of new...front disc rear drum...now the brake pedal has to be almost all the way down for me to stop at a stop sign or stop light...and so on...now when I push the pedal even a little bit I hear a hisss sound...kind of like when you let out the air in a coke bottle slow...what could be the problem...Its scary to drive my car...and now its going to rain...if no one knows just pray...thanks. I also put this into the classic forum..I need all the help I can get.

is it leaking fluid? check that first. if not maybe a bad booster

I don't think its leaking fluid...I just put some 1 week ago. And it really doesn't look any differen't. thanks...hope that helps you out some? How much does a booster cost? Im so worried my poor baby.

could also be a bad master cylinder

Brakes are sort of new??? Did you have the rear wheel cylinders replaced, or a brake line?

Might be they just need bled. And usually when a Vacum assist Power brake booster gets a leak or goes bad the pedal does not want to move at all.It makes for a very, very, very stiff pedal. You have to stand (Literally) on the brakes.

I agree with bleeding them! Give it a shot!

also if it's original ck the little round vacum valve on the out side of your booster,i had to buy one before i drove my 69 grande home,the bozo i bought it from-cough-chevy guy-cough had put tape over it:rolleyes:

If u bleed the brakes, and it still does the same, it's the brake master Cyl. Only about $30. I think it will be just that, a new master cyl. My bronco did the same thing when I replaced my brakes. When a master cyl gets worn, along twith the old brakes, it will still work, but when U replace the brakes, the master cyl is now having pressure build up when is wasen't used to having it. What is happening is the pressure of the fluid is bypassing through the seals, back into your Resivor. Also, you'll notice that your new brakes will wear faster then before. This is because the fluid that is bypassing the seals, is making backpressure, so when U let off the brakes, the back pressure will make the brakes rub harder then normal. Making abnormal wear. Hope this helps.

update:
went to my uncles friends place...He said I may need a electric vacuum pump or something like that...I have a very mild cam in the beast. Now the master cly. has recently been replaced. I haven't tried bleeding the brakes YET. Now the pedal has changed some I push it in about 1-3 inchs. and it hisses. and from there on get ready to stand on the brakes to stop that thing. It is very hard...The did a test on the vacuum at the brake booster took off a hose. The test is as followed.
at idle 500-600RPM. 10 psi of vacuum. at about 3kRPM it was at 40psi. So does that help anyone...I don't know anymore...
p.s. thanks for all the help

sounds like the brake booster is bad .....my 78 did the same thing when the booster was going out.........

sounds like you got plenty of vacuum