With no lose of fluid 1st to suspect would be the master cylinder
October, 7, 2011 AT 5:33 PM
Could be the seal to the master cylinder to check pour soapy water where the cylinder and the firewall meet
October, 9, 2011 AT 5:00 AM
You can't check it like that. There are internal plungers in there that, if bad, will allow brake fluid to bypass and the pedal go to the floor. Make sure there are no leaks at any of the wheels or the steel brake lines. One other thing is the rubber brake hose. Make sure they don't expand when you press on the brake.