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FJR Motorcycle Forums
Technical & Mechanical Problems
Front Brake Dragging Fix Attempt (Uh oh, that's not good)
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<blockquote data-quote="joebiodiesel" data-source="post: 898946" data-attributes="member: 24445"><p>The fact that the piston came out is not what caused the brake drag. If it didn't get cleaned or replaced properly may be the cause though. Finding the brake drag shouldn't bee too hard.</p><p></p><p>Raise the front wheel.</p><p></p><p>Pop one of the calipers off.</p><p></p><p>Spin the wheel.</p><p></p><p>If the drag is still present, remove the other caliper, and spin the wheel again.</p><p></p><p>Once you figure out which caliper is causing it, give it a good visual inspection.</p><p></p><p>Determine which piston is hanging up, then take it apart.</p><p></p><p>Any bumps, pits, corrosion, damage, whatever on the outside of the piston would warrant replacement. The pistons have a very tight fit in the caliper and don't tolerate any kind of distortion on the outside diameter.</p><p></p><p>Also, keep in mind that most brands of brake cleaner will cause the calipers seals to swell, and may be the cause the binding you are experiencing. The good news is that if you let the seal dry overnight it will often return to normal size. If you just put the piston back in there, and forced it at all, you may have damaged the seal and that's what is causing the binding.</p><p></p><p>You probably should have bled the other caliper too, but having air in there would not cause binding. A soft pedal, but not binding. Bleed it when you're done. I doubt you'll get any air out of it, but it only takes a couple of minutes, and it'll be good to get some fresh fluid in there.</p><p></p><p>Joe</p></blockquote><p></p>
[QUOTE="joebiodiesel, post: 898946, member: 24445"] The fact that the piston came out is not what caused the brake drag. If it didn't get cleaned or replaced properly may be the cause though. Finding the brake drag shouldn't bee too hard. Raise the front wheel. Pop one of the calipers off. Spin the wheel. If the drag is still present, remove the other caliper, and spin the wheel again. Once you figure out which caliper is causing it, give it a good visual inspection. Determine which piston is hanging up, then take it apart. Any bumps, pits, corrosion, damage, whatever on the outside of the piston would warrant replacement. The pistons have a very tight fit in the caliper and don't tolerate any kind of distortion on the outside diameter. Also, keep in mind that most brands of brake cleaner will cause the calipers seals to swell, and may be the cause the binding you are experiencing. The good news is that if you let the seal dry overnight it will often return to normal size. If you just put the piston back in there, and forced it at all, you may have damaged the seal and that's what is causing the binding. You probably should have bled the other caliper too, but having air in there would not cause binding. A soft pedal, but not binding. Bleed it when you're done. I doubt you'll get any air out of it, but it only takes a couple of minutes, and it'll be good to get some fresh fluid in there. Joe [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Front Brake Dragging Fix Attempt (Uh oh, that's not good)
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