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Rear Brake keeps Dragging

tallbill17

New Member
Hi, I have a 87 FLHTC 50k miles, my rear caliper started dragging to the point it was slowing down my speed. But it would seem to do this after going for about 5 miles,even on interstate where I would not be using the brake at all. So I cleaned the caliper good but still had the same problem, So I got a rebuild kit and new pads from HD (with new pistton) and did that. Still have the same problem. That narrows down Master Cyc. or Brake lines. My question is what which should I do first?
 
The master cylinder valve assembly has a relief or bypass orifice that relieves pressure when the brake is released. As old as your bike is, it's likely that it is clogged and causing your brake to drag. A rebuild kit is not expensive and easy to install. It's a good idea to flush entire system with new fluid of the correct DOT#.
 
Have you checked the runout on the brake disc? Buddy had one that the disc was warped and would heat up the caliper and cause the fluid to get so hot that the pads would seize and stop the bike.
 
The master cylinder valve assembly has a relief or bypass orifice that relieves pressure when the brake is released. As old as your bike is, it's likely that it is clogged and causing your brake to drag. A rebuild kit is not expensive and easy to install. It's a good idea to flush entire system with new fluid of the correct DOT#.

Agree with Breeze, you can con firm the master bad by cracking the bleeder when the brake locks up, if you have residual pressure fluid should squirt out, master cylinder replacement with total flush of correct fluid and check free travel of push rod:s
 
I had a wee bit of brake drag from time to time earlier this year then there was no brake a master cylinder rebuild kit did the trick

Brian
 
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