master brake cylinder gone wrong ?

I step on the brakes, and within seconds the pedal goes all the way down and loses its effect.

 

Could also be brake booster or could be leaking break fluid.

 

Well if it was leaking im sure i would have to be filling up the tank constantly correct..
Im going to further inspect and record what i see.

 

Get back to us after a more in depth inspection.

 

I am also having the same problem but not as severe as yours. When ever im breaking for a long time, like if im going from 55 to a stop sign, the pedal will very slowly start going to the floor. I blead all my brakes last night and all calipers are getting fluid but i noticed my abs module looked like it was leaking out of the bleeder thats there on top. I retightened the bleeder and its still doing the same thing.

 

any help out there?

 

master cyclinder or booster

 

well I think i found out my problem but i need to know how to fill that little resivor on top of the abs module. It looks like there are two screws holding the plastic tank down and a bleeder right next to it so idk if im supposed to bleed that or what?

 

it's the master cylinder, i learned this from my brakes class. the master cyl. is bad. replace it with a new one, the problem will then be fixed.

 

Remove the grey cap and pop open the plug underneath to fill the older pumps.

 

Would this be the same for non-abs?

 

How do you pop onpen the plug? Your talking about that big rubber cap?