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Why do I keep destroying O-rings?
I'm very, very distraught.
I am trying to rebuild the right rear brake caliper on the 90 cq. The
piston is a Girling screw-in. Every time I screw the piston in, I take a
half-inch notch out of the o-ring that rests in the cylinder groove. I'm
not completely severing it. This is before any hydraulic pressure is
applied. And on the three rings I have used, the notch is identical!
I have absolutely no idea why!
Thing is, the piston is as smooth as glass. Really smooth. And I'm using
buckets of brake cylinder paste.
My only two hypotheses:
1. There is a microscopic imperfection on the cylinder.
2. The friction between the cylinder and the ring is sufficient to take
a chunk out.
These hypotheses seem incorrect. Am I missing anything?
A bad batch of rings? Any way to buy these rings at a lower cost?
These kits are getting expensive.
I should have stayed in bed today,