So last night I was on my way home in my 1993 ranger 4.0, and while I was going down the highway there was a big popping sound from the front drivers side wheel and it pulled me hard left. I pulled over and everything seemed fine (Couldn’t see much in the dark though) so I went on my way home and I noticed that I had no brakes at all, so I parked it overnight. I went out to see if I could figure out the problem and I do believe I have a wheel bearing completely shot because the tire has a lot of camber to it, but I went to see what I could do about the brakes and the fluid reservoir was still full so I jacked it up and pumped the brakes 30 or 40 times and I had no fluid leak at all. So I bled the brakes thinking maybe it got air in them somehow, but everything was fine and they bled perfect so I put it back down and I had just fine brakes for like 15 seconds then they were completely gone again. Now I’m just dumbfounded as to what could be the issue. Any ideas?

 

Take off Master's cap and have someone pump the pedal hard while you watch for fluid movement in the reservoir..............................should be none, if you see fluid raising up the master is bad, piston seal or check valve is not allowing pressure to build up, pressure/fluid just flows backwards into the reservoir

I did have an inner brake pad come off and wedge between back plate and rotor , which caused no brakes because caliper could extend too far so sucked up all the fluid and pressure
But I could hear the pad rubbing on the rotor