Thanks for the help! Every time I post on this site a get an education.
stevebfl- I was chasing my tail. What I initially believed to be the vacuum pump was in fact the proportioning valve. I also thank you for your detailed explanation. I echo palangi's sentiment.
Mbenz- Boy, you got that right. They are just different enough to make you wonder if you are working on the same manufacturer's cars. I had heard the pump on mine kick on when I would lock the doors. Buzzing from the rear of the vehicle. I thought that THAT was the only vacuum pump prior to my post.
Speedy300Dturbo- Thanks for the links. I had seen them before but could not remember where. I tend to read things like this and have to come back to you experienced folks for clarification. Luckily, I can.
Anywho, I guess the 300D has NO vacuum. Shall I rebuild the pump?
'98 Harley Springer Softail