brake pressure loss

[turbozeke418]

I have a 1980 300TD. I was driving last night and I started to smell an electrical burning smell inside the car. I stopped and started to see a little smoke coming from the front of the car (passenger side). I opened the hood and everything was fine, but could still see and smell smoke in front of the head lights. I drove the car again and went to stop and there was no brake pressure at all. The pedal went to the floor and even pumping it did nothing. I let the car sit for a while started it and drove and it stopped again no problem at all. I just drove it to work this morning and again, no problems at all. I'm at a loss for what could have happened and what was burning on the right front side? I replaced the pads all around about a month ago. Any ideas or suggestions would be appreciated.