First ride out, and within one mile both front & back brakes had seized.
Calipers off, inspected pistons, free as a bird. Checked master cylinder, problem with the piston valve, not allowing the brake fluid to bleed back through to the reservoir at the required rate, causing the brakes to stick on. Tallies with the fact that after the brakes had locked, a few minutes later they freed off by themselves. On stripping the cylinder, quite a bit of corrosion around the piston circlip, the dust cover had perished, the piston inner seal rubbers didn't look great, but not overly bad. Blowing through the cylinder, moving the piston in and out, certainly felt a restriction. Hoping a piston rebuild kit will do the trick. Keep you posted.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30