I just bought a civic cx with BAD Brakes!!! I replaced the rear brakes/wheel cylinders, also the front brakes!When I got the car there was no fluid in the system.
Ifilledit with brake fluidand bled the system, but still the brakes dont engage. After checking the system their sound like air is passing through and not holding in the Brake Booster!

Is my brake booster bad, or is their something else?

 

What year and model Civic do you have?

 

1992 CX Hatchback. I just noticed that I hae pressure on it when the car is off, but once I turn it on, I have just enough to stop the car slowwwly.
Should I bleed them again?

 

Are you bleeding for passenger's rear, to driver rear, to passenger's front, to driver's front?

Also, check the vaccum lines to the booster.

 

I completely agree with danomatic93. Re-bleed the brakes in the correct order (see picture).

[IMG]local://upfiles/25538/137BDD7DCAD2463099FCBC0FD518DB62.jpg[/IMG]

 

Yes bleed again. Your booster seems to be working OK as it is helping increase the force to the brakes when the car is running, but even with proper force the pedal just goes to the floor since something else is wrong.

If you're sure it's fully bled and the pedal still goes to the floor without stopping the car, probably need the master cylinder.

Does it appear that the brake system was contaminated with oil or a substance other than brake fluid?

 

I blew out the brake booster in my CRX. Once it went, the pedal was very stiff, and the car stopped very very slowly. When I stepped on the pedal, I could hear air whooshing under the dash, and the idle jumped all over the place (because of the vacuum leak). If that sounds like your car, you may have the same problem.

 

mxs is right about a blown booster, had that happen to me too. The car will still stop but you have to press very hard on the pedal. And the engine will idle poorly or even stall when stepping on the brakes.

 

Have you checked your brakemaster cylinder

 

I had a similar problem on my old Ford Festiva (best car ford ever made ) with a blown master cylinder...