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Check the fluid level anyway but what @skinny said.
A quick CSB. I was on a police motorcycle course on a BMW R80 on a duel carriageway in the New Forest doing @115 mph. On the approach to the r/a I braked and braked and slammed down through the gears to a halt 10 feet over the line on the roundabout. The right hand front Brembo caliper was hanging loose because the mechanic had failed to tighten the bolts.
had a service last week and yesterday setting off from cold first time went for back brake absolutely nothing there, pedal went right the way down - sorted itself on next depress - air in the lines? not bled properly?