Your mechanic may find a stuck caliper or non-functioning booster. Do the brakes pull to one side?
That's odd - does the RR corner sit low? Are you sure it isn't just a piece of tubing around the lower 2-3 coils on the spring? If the spring is truly broken, the car wouldn't be driveable.
Regarding the brakes, I did not notice some huge pull to one side or another. Steering was a bit vague but I figure that is because of ancient bushings.
As for the coil, attached is a picture of the coil I took yesterday, will try to get more detailed shots..