my pedal goes to the floor, no matter how much i pump the pedal i can't get it to stop. i assume this is the master cylinder cause i have all my fluid. i lost my yota haynes so i need some help. how hard would it be to change this? and do i need any special tools? thanks guys, still learning...

 

Master cylinders are super easy to change. You will need a 10mm line wrench, and a 12mm socket.

Remove the 10mm lines nutes first, then take the 4 12mm nuts off the brake booster.

Insall is reversed, then it must be bled. If you put a used one on, you will not need to bench bleed it. If its new, it must be bench bled. That means bled before install.

Then, bleed the entire brake system starting from pass rear and working to the drivers front, and Viola!

 

Great, thanks for the hope. Before i go and do that, what else could be causing my problem? I just read that someone had no pressure and it turned out to be the rear brakes (pads and drums i guess) that ended up causing the problem.

 

That would mean that the pads/shoes were wore down to the point that that the cylinder/caliper is fully extended and the pedal hits the floor before your pads/shoes hit anything. Just check for wear. If they look halfway decent probably the MC. The only other thing I can think of is either leak (but you said you have no loss of fluid) or a lot of air in the system. If this just started happening w/o doing anything to the system, I would suspect MC.