I just purchased my 5th FJ40, it is a basket case but I knew that going in.My main problem now is the brakes. When I got it the brakes would pump up but not hold pressure. I checked all wheels (new brakes in front) (following CoolCrusiers recommendation) I adjusted all wheels. There are no leaks in the system, all wheel cylinders are dry. At this point figured the Master cylinder must be bad. Bought and installed a new MC (Ebay-Centric special). Tried to bleed air out of system after running 1.5 quarts of new brake fluid through system still getting bubbles and have the same problem as with the old master cylinder. Brakes will pump up solid and if you hold the pedal down it will hold but as soon as you let up on pedal the brakes go to zero. At this point I connected my vacuum pump to the output of the new Ebay special MC and got a steady fluid and air buibbles. My problems is I suspect the new MC is bad butt it appears to be the same problem as the old MC, where am I going wrong?