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thanks for your thoughts, the contamination of the pads was my first thought so I changed them for new ones plus I've done a complete bleed with fresh mineral oil (they're Shimano) I've also cleaned the rotor both sides with a clean cloth and Finish Line Speed Degreaser.......still scratching my head as I've done hydraulic brakes before with no problem
saxby's
@MTB-Idle
That sounds like a combination of dirty/greasy rotors and or pads that have got some grease/contamination on them.
Disc brake fade is a result of the brakes being used too much resulting in the rotors heating up and the hydraulic fluid boiling. This results in a complete loss of brakes as the levers pull to the bars with no result.
It's unpleasant, I've had it a few times when downhilling on my MTB in the alps.
I'm assuming you are commuting on london/local roads rather than descending the alpe d'Huez.
So it could be the pads, the rotor or perhaps you need to do a 100% hydraulic fluid change rather than just a small bleed to get rid of any air