Smoke/Burning smell from wheel well...Caliper?
I have a 93 Aerostar RWD 4.0L that I was driving around town a few weeks ago and I noticed it wasn't braking that well. The pedal is usually firm but easy to push and very sensitive...instead it was a lot firmer and didn't brake as quickly when i put my foot down. The van itself felt a little under powered, like something was holding it back and I had to put my foot down a lot more to get it up to speed. After awhile I began getting a really bad burning smell coming in through the driver window. I pulled over and saw small faint lines of smoke coming out of the front driverside wheel well, upon closer inspection I got a good wiff of burnt brake pad (I am familiar with the scent) and the hub cap on the wheel was really hot. I automatically assumed the caliper was ceased. Later when I had free time took the wheel off removed the caliper from the wheel and everything looked fine. I was able to push the piston back in with ease using a C-clamp, but there was a lot of corrosion in and around the piston, I wire brushed it off and greased and cleaned everything up. I took it out since then on a few short trips to the store, everything seemed fine. Today however it happened again, and I began smelling burnt brake pad from the same wheel well. It only seems to happen when I have been driving it for a long time like 30mins to 1hr, short trips everything is fine. Is this the caliper or the Master cylinder? Due to the excessive heat around the wheel hub should i maybe think about replacing the inner and outer wheel bearings as well?