The Shogun's decided to lose brake fluid. Rapidly. Even when not in use.
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That'll be why.The inner pads on both sides are utterly invisible when it's all together, and the caliper sliding/locating pins on the RH side were both utterly rounded off.
I knew the outers were very low, and the disks manky, but... Turns out that the RH inner pad was making a bid for freedom, thanks to a broken clip, which allowed the piston to pop out of the caliper.
The LH pad & disk were worse, but they'd stayed in place. The piston's "only" wedged at an angle in the caliper.
At least the flexis undid easily from the calipers.