Originally Posted by Jwool15
Don't get used to it.. Same thing happened to me with the same diagnosis. THey replaced my master cylinder and all my lines. Great for about 2 months. Now they're back to their old chitty selves.. Sorry to burst your bubble man. I sincerely HOPE though that you dont have the same problem as me and they did fix it. My truck has been in 5 times alone just for brakes and each time theyve done something different..
Your dilemma is most unfortunate indeed. My advice would be to start fresh with a different dealership. Having the experience in auto mechanics that I do, I can honestly say that I feel 100% confident that the problem I was experiencing with the brakes on my truck has been resolved. The simple fact that they took the time to check the actuator rod speaks volumes. This is a little known part which can play a very large role. As I stated in a few posts above, if this rod is not set correctly, it can give the brakes the feeling of being very soft because it is not fully depressing the piston within the MC. If you simply push the pedal one more time you have effectively doubled the pressure.
Think of it this way. I have a 347 in my stang. Itís a 302 with a longer stroke made possible by a longer rod (and crank). Now apply that analogy to the length of the rod which is pushing the piston in the MC. If the rod is too short, then each time you press the pedal youíre only getting, say for arguments sake, 50% travel. You can attain that stiff feeling in the pedal if you just press the pedal one more time. This is like pumping the brakes, but you only need pump them once to attain this vs pumping several times for brakes with air in the lines or a very weak MC.
If your truck is still under warranty, take it to a different dealer and have them check the rod since you already have a new MC, or you can simply pull the MC forward and pull the rod out, note how long it is and go from there.
As I said, knowing what I know through 15+ years of building motors/working on cars, I can say that my previous issue with the brakes is now a thing of the past. I canít imagine how they can be solid at this point and in just a few months go soft again, UNLESS Ford has a very serious problem with QC on their MCís.
Keep us posted on the progress of your brake issue!