I've pull down an RA23 and an MA61 MC in the last 2 weeks, both had a crusty substance around the seals that had jammed the piston in. Not sure if it's a reaction between the grease and brake fluid or a result of sitting un-unsed. It's about the consistency of sand but breaks up into a powder when crushed (if it were dry that is). So it doesn't score the MC or anything. But I'm sur4e it wouldn't be good for the seals. Does anyone know what this stuff is or where it comes from???
Fri, 18 June 2004 02:56
