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![tonybaker2](themes/aaAle/images/interface/profile-pic-placeholder.47cf740a.png)
right side rear brakes are 30% down compared to other side. Fitted new pads both sides, bled cylinders, brakes not binding. Mitsi Grandis Royal 1999.
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So, presumably, you're asking what the problem might be?
There are numerous possible causes, including a lazy caliper, partially collapsed brake hose, partially seized calliper slides etc, etc. However, I'd suggest the most likely cause is the brake proportioning valve.