We already tried that additive called "Additive for immersed brake fluid" original MANITOU packing - no other specification but with no result. The brake squawk is still there. We even changed the discs on the other machine with no result. We have ordered new set of discs for this machine and the part number has changed from the old to new. Maybe they have had some problems at DANA and are delivering some new discs with other materials. We will see. Hope this goes away as I don't see any other solution to the problem!