Scary brake fail

Thought my life was over this afternoon.
Heading down to a roundabout at Haddricks Mill, Gosforth, Newcastle and my 105's failed causing me to just miss a British Gas van and causing a Ford Ka to brake suddenly.
No idea what caused it as brakes worked fine when I pulled up and checked them except for an oily film on the rims (I've a suspicion someone at work has been at the bike).
Not good nevertheless. Lesson is check bike before I set off.
Heading down to a roundabout at Haddricks Mill, Gosforth, Newcastle and my 105's failed causing me to just miss a British Gas van and causing a Ford Ka to brake suddenly.
No idea what caused it as brakes worked fine when I pulled up and checked them except for an oily film on the rims (I've a suspicion someone at work has been at the bike).
Not good nevertheless. Lesson is check bike before I set off.
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However, there has been lots of water on the road up here on Tyneside, could just be a bit of oil or diesel sprayed up.
Kona Jake the Snake
Merlin Malt 4
I've never had an "oily film" appear on the front rim. I assume this mysterious film was on both rims? The front brake is more important for braking than the back
follow on
Apparently they'd asked for my bike to be moved but staff forgot to move it before they went ahead with the job.
No worries now we got to the bottom of it.