[Roadsters] intermittent brake pulling

[Tim]

Recently my SPL has been pulling to one side--or the other--when hitting the brakes. It has mainly been to the right and not very hard/severe. The last three or four times driving the car, the pulling has been to the left and very hard/severe. Last evening the pulling was hard and to the left, then once I had been on the road for about 10 miles or so, the pulling was back to the right and not very hard.  (I have put the brake work on the SRL on hold until after our Midwest Roadster Run next weekend.)

I have not had the wheels off yet to look at the front end. I will do that this afternoon after work. I wanted to post this to you all first. 

Any ideas?

Tim
Belleville, WI.
'70 SPL AND SRL
Still clueless but always learning