Thanks, guys. Still haven't changed the fluid as yet, but there's some updates as to my steering issues. I still have a pull to the left (pretty bad) when driving down the road, and when breaking. I had all my stering links checked and the alignment was fine as well.
My mechanic found that there was some play in the front right wheel bearing, so this might have caused the play in the steering that I was complaining about, but since he tightened the bearing, the steering feels stiffer than ever. (maybe it was always supposed to be like this and I just got used to it being quite loose!)
So I will check the fluid change and see what it does, and I will give the front left break caliper a look over too. (I've had issues with my calipers since buying this car)
1976 230.4 W115