Brake issues

[JTrowbridge]

I have been haven issues brought it to a mechanic and he gave me no answers. About 5 years ago I had stainless steel brake lines put in after about 60,000 miles I've been haven an issue with my rear passenger well I replaced the brakes and my fronts were frozen in an open position seemed like the pads were to big to the caliper even the replacement pads I had to grind down to make fit well sense then my rear passanger has been wearing out extremely fast olny one pad seems to be stoping the truck I've brought it to a grave the power bled it and replaced the brakes and calipers and it happened again and again I'm leaning toward the master cylinder but shouldn't a mechinic know if that's bad wasn't sure if it was a common issue with these trucks or not

 

[Auto Parts Guy]

Welcome!
So you have replaced all 4 calipers, rotors, and pad sets? What symptom are you having? How does your pedal feel? What did you have to grind on the pad?

 

[ygmn]

Guide pins lubricated?