Is it the pad not returning due to a sticky piston? How dirty is caliper?

That's today's lesson learned. I didn't know bikes had rear brakes.

funny isn't it that even Moto GP bikes have a rear brake and they're there for a reason - to be used.

It could just be deposits on the disc, do you take it for a spin to dry them off after washing it?
Try doing a couple of fairly hard stops from 50 just using the rear and seee if it clears up.

Don't you get a warning light when the ABS is triggered?

Didn't John Hopkins say that the rear brake should be painted red and marked for emergency use only?

The rear on my bike isn't worth having, it does fk all.

Same. I use it occasionally to level the bike when braking with a pillion on or to lean on in a tight u-turn, but thats about it.

There's a quote from - if I remember correctly - Wayne Rainey in one of Keith Code's books, which says 'I occasionally use the rear brake when I pull into the pit garage...'

Some do, some don't. When I was racing, I never did, but then again, I never ended up winning any BSB or WSB titles either, lol!

Interestingly, Mick Doohan had his thumb operated rear brake fitted after his busted leg disaster at Assen in '93, and he used to talk about how useful it was to control wheelspin?

And so, the argument rages on.....

The thing is that rear brakes are crap on bikes and do very little. I filtered loads when I used to commute on a bike, but never bothered with the rear brake. Each to their own, but you need to lift your foot off it.

Motorbike brakes are very different to pushbikes.

I use the rear brake for low speed stuff, like filtering and in towns as it has less effect on the suspension and leaves my hand free for angrily blipping the throttle to alert the car muppets. I also use if more in the wet.
Anything higher speed is front or both.