super brakes

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Following on from my post on my jcb.

After getting one of my supers in to work topping a field, the left brake has started to stick on. This had been a problem with my other super and always seems to be the leftside.

I had the linings replaced and cleaned it all up about 5years ago.
I will strip out again, as the tractor has not done anything, untill very recently. Lack of use has not helped.

I am going to replace the actuator return springs and the 6 ball bearings this time. I have sourced a supplier for both. I won't be going to the tractor for a while and want to order the ball bearings in time for my next visit.

To get to the point, what size are the ball bearings please?