Everything was all good untill this past weekend my brakes suddenly went to the floor. So I played with them to try and figure out what's going on. If I push real slow it goes all the way to the floor not stopping my car.

If I push it real quick it grabs pressure and is able to stop but only one tire is locking up. At the time it was pulling left so I assumed the fron left was locking.

Well while I had the car in the air at my work the next day I tried to bleed them. Toooons of air in yhe front left and right rear. It made the brakes WORSE!!! If you remove the brake bleeder and smash on the brakes no fluid even comes out so we pushed all the existing fluid out while bleeding. So now when cars in the air, brakes pressed down he tried spinning the wheels, front right and rear left did not move. Front left and rear right could spin freely. So my knowledge and guess is the proportion valve.

We looked for leaks and followed the lines. Past day or two I have been wondering if it could still be the master cylinder. I replaced it about 6 months ago from an Oreillys brand new one. Why I think that is because there's 2 lines coming from the master one for front right and rear left and one for the other side. Could the master be leaking internally not building pressure to force fluid into that part of the system but putting pressure in the other side? Same symptoms are happening if I push slow nothing car keeps rolling. If I push fast it grabs at the very bottom and only the front right tire is working to stop my car.

It is my only vehicle and I understand the dangers. I'm always on the E-brake, it's a 5 speed, and I keep my distance with people in front of me.

I need help. Can't wrap my head around What a actually failing here.

 

Systems are diagonally split. Probably have a bad seal in the MC. Return it for a new unit would be the simplest.

 

Thanks. So what I did was test the MC, i put bleeder valves in both holes. Pinched of the line of the diagonal side that was still working pumped th3 brakes and no fluid was coming from the front piston. So I took out the MC to see if bench bleeding would do anything. Man tons of air came out of that front piston. Bled the MC till it was solid fluid. Installed it doing each line seperate to try and not get any air in the system. Bled the brakes right rear and front left. Then opposite. Worked like a charm cars brake engage pretty early and are solid when I grab them hard. Still has some squish at idle. Not completely stuff but I don't remember them ever being rock rock hard. Ohhh and when i removed the MC the old seal from the previous MC was still on the plunger of the pedal/booster.

Hope this helps anyone else diagnose there problem.