Replace the brake lines !
Yamaha service says lines should be replaced after 4 years, and this is one of the reasons why.
As the inner material of the line deteriorates with age, it is possible for tiny pieces to break away and get lodged in the master cylinders return orifice. This could allow fluid to enter the line to squeeze the brake pads, but block the return, effectively locking up the pads.
Ron, Erie, Pa.
SOURCE: 2007 Royal Star Tour Delux with 15,000 miles Rear brake issues.
No you should have from time to time safety checked your motorcycle, brakes are a normal wear part and should have been replaced before the friction material had completely worn off.
SOURCE: 2007 Royal Star Tour Delux with 15,000 miles. Rear brakes scored
Not an unusual problem, no recalls. Replace pads (and rotor, if necessary), but after brakes are bled, loosen the bolt between the rear caliper arm and the swing arm, have someone apply and hold rear brake, tighten bolt. The arm, which holds the caliper in line with the rotor, occasionally loosens and allows misalignment. Checking pad thickness on both sides of the disk regularly will reveal caliper problems if wear is not evenly distributed.
SOURCE: Brakes on front of 1998 Yamaha Royal Star Tour
hiya
sounds like the brake cylinder needs servicing drain out the brake fluid and remove it from your bike take out the pads and spray some wd40 over the inside then replace the pads if they are worn and reassemble replace the brake fluid that should cure your problem
hope this helps
John
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