| Sounds like more than a fluid problem IMO.
You can mix "conventional" fluids, such as DOT 3, 4 or 5.1.
The .1 is the crucial part where the 5 is concerned though.
A DOT 5 is a silicone based race fluid whereas the 5.1 is a high performance road fluid.
The silicone based 5 doesn't mix with normal fluids and can cause the seals to swell. This stuff is expensive though, and you wouldn't see it in a normal service workshop??
The small screw that controls the piston travel isn't there on the brake lever, only the clutch.
The one thing I can think of that could cause it would be a pattern lever. There are several types and some are crap.
I fitted one to an Aprillia RS250 and it wasn't quite right and didn't allow the piston to return fully. Essentially it dragged the brakes and as the heat built up, it locked solid. Fortunatley, it happened pretty quickly, I was riding it and the RS isn't exactly endowed with buckets of torque to pull off quickly. |