Front Disc brakes dragging, master cylinder??
I have searched other posts, but haven't found an answer to my problem.
Truck: 99 Dodge 2500, rear anti-lock only, 4x4, diesel.
I replaced some rusted out rear and front brake lines a month ago and bled the brake lines as best I could get. Got the pedal to what seemed normal, was a little spongy at first but things seemed good after a number of pumps and overnight. Took a trip longer than around town, 20-30 miles into it and could smell hot brakes (both front equal). Wheels also quite warm. Brake pedal seemed somewhat normal. Didn't have time to check it then, so it sat for a week or so. Brakes seemed normal around town again for a short while. Then, hopped into truck and brake pedal was high and only required very small amount of pressure to stop, brakes were dragging. My immediate thought was to replace the original rubber lines on the front. Thought it odd that both would break down at the exact same time. Replaced the drivers side first. Caliper still sticking some and dragging some. While front wheel was off, proceeded to remove caliper and as I usually do I slowly apply pressure from a c-clamp to push piston back. Piston was not going back as it would in the past, cracked the bleeder screw and then it went back, didn't push it all the way back, because I wasn't installing new pads this time around. Since the piston moved back, I figure the caliper clyinders are not sticking. Caliper slides were cleaned and smoothed out and lubed with never-seez. At this point I re-tried pushing the piston back again, still no go. I then started to crack the brake line fittings from the first one from the caliper up the the aluminum block with the switch/sensor and on to the master cylinder, all this with some pressure applied to the c-clamp. I had fluid squirting out of all the fittings (relieving the pressure). The only thing that seems to be stopping the fluid from getting back to the reservoir is the master cylinder. In all my previous brake jobs the fluid will go back to the reservoir when c-clamp pressure is applied slowly. Is it time for a new master cylinder or have I missed something? Thanks for reading and offering ideas!!