Hi, the brakes on my 1984 300D seem fine when I'm just driving around town, but the other day I drove out about 20 miles (I live on Oahu and we don't have very far to drive usually) and once I got off the freeway and had to stop at a light my brake pedal went mushily almost all the way down. With a little pumping it came back up, but I had to nurse it carefully to my destination to avoid any kind of need for a sudden stop. I drove home later in the day - the same route, but didn't notice the problem when I got off the freeway at my end. Had the brakes done a few years, and very few ~10,000 miles, ago.

Anyone had this? Know what the problem is?

Many thanks in advance.