[montea]

i just put on new calipers. front brake lines, pads, rotors, rear shoes, wheel cyl and a Used master cyl from a diff car(same thing but the fluid tank ontop is a little smaller).

before i started to bleed the brakes the pedal went right to the floor no problem... started to bleed the front passenger side and let out the air like 3 times then i heard the brake pedal clunk so i went over to see and about 1-2 inchs from the floor the pedal makes a clunking sound. i removed the master cyl and found a drip of fluid where the brake booster pushes it. with no master cyl attached i tried the pedal and it goes to the floor no problem.

is the problem the master cyl is messed up or would it be the brake booster when there is the load on it. also the engine was turned off the whole time.