How much play or movement is normal on the rear floating calipers?

Replaced rear brake rotor and pads today. Bike has little braking power from rear. Couldn't skid if I stood on the brake. As it was the pads that came off were worn as if the caliper was slightly at an angle. It brakes a bit better with new parts, but I suspect they new ones are only getting partial contact due to angle.

First thought was to replace all the OEM bolts and sleeves, mostly the rear sleeve. Before just replacing $30 worth of fasteners, has anyone else had this problem and is there another possible problem? I just bought the bike a few weeks ago and don't know much about it's history.

 

The stock rear brake on my VTR felt as though it belonged on a dirt bike. Braking performance did not improve until I replaced the brake line. Another problem could be air in the brake line. The rear brake line and caliper can be a bit tricky to bleed. New pads can take a while to bed in too.

 

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Dismantle the brake and check that the slider pins & sleeves are free moving and not corroded and copper greased. Also that rubber boots/sleeves are intact and keeping water etc out.

Clean piston, check seals (if necessary replace) and make sure it all moves freely and give it a good bleed.

 

I bleed it and flushed out all the brake fluid while replacing the brake line. Will check sleeve for wear tomorrow. The front pin was like a rusty old nail. Back wasn't in bad shape. Was wondering if the caliper mount could be bent too. Will check tomorrow. Thanks for the quick feedback.