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I'm the 2nd owner to a 2002 sv650s and this is my learners bike I currently flushed my front brakes and put new fluids and pads but now on the rear caliper my two pads won't fit its not the size its the pistons not moving far back they do move (forward only) when I push on the lever but won't move back. The last owner was a crappy owner from looks of it he barley did maintenance on the bike. Anyone know why the pistons might not be pushing back I've tried by hand they are super stuff and stuck. I'm assuming it might be grease and dirty stuck behind the piston last fluid was pretty dirty anyway to clean it ? Anything I can push through the caliper to get it clean? I'm a beginner with motorcycle so my idea of the piston may be wrong. Any help would do. Thank you
 

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I'm a beginner with motorcycle so my idea of the piston may be wrong. Any help would do. Thank you
Welcome.
It takes guts to just jump in like that.

First be sure that the master cylinder, attached to the rear brake pedal is fully retracted.
If it isn't, it will be next to impossible to push the pistons back.....because that seal is what makes the brakes operate.
The seal releases ONLY when the piston in the MS is fully retracted; that allows the fluid to flow back up the
line into the MS when the pads are pushed back.
 

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First thing do not press on the pedal while you have the caliper off or you will end up with the piston on the floor and all the fluid everywhere. If the piston is grubby then you can clean it with a specialist brake cleaner...make sure you clean all the crud off.

To force the piston back in I use a small 'G' clamp and a block of wood. Position the block on the piston and mount the clamp so it presses on the block and the other end is on the back of the caliper. Slowly tighten the clamp so it pushes the piston back into the caliper via the block on the piston.


Check the fluid level...it will have risen some or considerably. If you need to remove some you can use an old rag to soak it up or a small hypodermic plunger. Make sue you do not drop the fluid on any parts...chrome, painted or plastic. If you do wash it off with plain water...do not rub or wipe it off.

Hope I am not preaching to someone who knows all this.

Good luck
 

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Yes as A.S. said use a clamp to push the piston back and you should be able to get the caliper back on with the new pads.
 
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