03 Brake issue....need help

Hi all! I have recently gotten my 03 road ready, Or so I thought. So my issue is that when I use the rear brake (pedal) the rear brakes do not disengage. After several hours they return to a position where the wheel will spin .I attempted to push the 3 pistons back in like a normal caliper, to no success . When I loosen the center piston bleeder screw, the brakes release enough to push the pistons back to place . I would greatly appreciate some help, as I would rather not pay over 100$ an hour at the local shop . Thanks in advance .

 

Yeah, sounds like a clogged return port on the master cylinder. You can probably get away with just cleaning it out with brake cleaner and compressed air then doing a fluid flush, but it wouldn't hurt to rebuild the master cylinder.

Either way you'll need a pair of snap ring pliers to remove the c-clip that retains the piston in the bore of the master cylinder. You might want to get a cheap pair, as I know I had to file down the prongs of my pliers to get them to fit the very small snap ring on my last bike's master.

One thing I've learned is that it's easier to reverse bleed a master cylinder than do a pressure bleed of the entire system. If you unmount the rear caliper and pump the brake a few times before taking off the master, then you can use the extra fluid to bleed the master when you re-install it by pushing the pistons back into the caliper.

 

Sounds like stated above. I have the same bike. Recently had bled the brakes the prior owner did not. It definitely need a little more effort to get them back to normal as the old funk made for a mess and getting all the air out really improved operation. The time and effort only increases your confidence in the performance of the brakes. I certainly noticed straight away both in it spinning when checking the chain and the operation (immediate release) when tapping or hard stopping If you can try to do yourself


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