RD400F Brake Pads

[SDDaytona]

I thought my brake pads were showing unusual wear so I ordered a new set. Turns out that's just the way they are. Never seen pads like these before.. any idea on the rational?

[SoCal250]

The pads are manufactured with opposing vertical tapers of the friction material due to the mechanical action of the caliper under braking. The caliper "swings" side-to-side on single mounting pivot bolt. Because the RD400F uses shitty single-piston calipers, one pad moves with the cylinder and the other pad is fixed.