MDZ1rider wrote: I haven't worked specifically on a KZ400, but almost all older Kawasaki are a single piston caliper. The piston pushes only the outside pad. The inside pad is is fixed against the caliper. The caliper floats on pins/bolts of the mount, centering on the rotor by the outside pad. The brake caliper lives in a dirty wet environment. Corrosion and and grime are a common problem. However, short of being rusted solid, a properly working M/C and piston should have enough force to overcome the worst rust and grime. Then the problem is the stuck caliper won't release the inside pad from the rotor. You may have a combination of problems. For starters, you need to remove the caliper and make sure it "floats" on the mounts to start. I think you may find that you don't have as much piston pressure as you think.
Yup, the caliper and piston work beautifully.. I think the inner pad may be too thin and worn..i can see the outer pad moving with enough pressure to move the rotor a little...
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