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xs650 > > Frank-in-Bike, Non XS parts that are Interchangeable > > Wheels, Brakes and Controls > > Front Disk Brake Won't Fully Release |
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Front Disk Brake Won't Fully Release
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pippend650 Full Member
Joined: Aug 27, 2009 Posts: 10
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Posted: October 19, 2009, 11:53 am Post subject: Front Disk Brake Won't Fully Release |
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I noticed the other day that something was really dragging me down and after lifting the bike off the ground, found that the front disc brake is partially engaged. There seems to be fluid in the reservoir and the cable is working. The lever releases fine. About the only thing different is the temperature has dropped about 20-30 degrees. Any thoughts?
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Visegrippe Full Member
Joined: Sep 03, 2009 Posts: 10
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Posted: October 19, 2009, 12:01 pm Post subject: Re: Front Disk Brake Won't Fully Release |
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could be the piston is sticking, aluminum contracts faster than steel, so that what was clearing before is interference fit now...
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jayel 650Rider Supporter
Joined: Apr 16, 2006 Posts: 3417 Location: SE Iowa 1974 TX650A
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Posted: October 19, 2009, 2:29 pm Post subject: Re: Front Disk Brake Won't Fully Release |
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the master cylinder resevoir has two small holes in the bottom of the cup one the about a 1/8" you can see and a smaller one hidden under the plastic tab of the cup if it gets plugged the excess fluid can't bleed back causing the calipher to stick, you need to clean your brake system and put in new brake fluid, pumping a couple refills of brake fluid thru it might clean it out but if it still sticks it's very dangerous could cause front wheel lock-up
_________________ all it takes is time and money -- Where are we going and why are we in this hand basket? |
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xsleo Full Member
Joined: Oct 28, 2007 Posts: 1528 Location: Earlville NY
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Posted: October 28, 2009, 1:23 am Post subject: Re: Front Disk Brake Won't Fully Release |
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If there is any moisture in your fluid it can settle in the caliper. At those temps it could be freezing. As jayel said , changing the fluid is a good idea. I change mine every couple years. This helps keep everything clean.
_________________ "You live more in five minutes on a bike than most people do in there whole life"
'75 XS650B with a 79 dual disc front end, rear disk brake, Chrysler reg, Radio Shack rect, LED tail/ brake and turn signals. |
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pumps 650Rider Supporter
Joined: May 29, 2007 Posts: 1993 Location: Kansas City, Missouri, U.S.A.- 1977 XS650 "D" Standard
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Posted: October 28, 2009, 10:14 am Post subject: Re: Front Disk Brake Won't Fully Release |
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Besides flushing out the system with new fluid it might not hurt to pull that caliper off and apart. See what the seals and piston conditions are. Mine seemed to work fine but after taking it apart for inspection it wasn't so great after all.Probably original 1977 stuff. Lots of crud and rust. I put a Brake Caliper Rebuild Kit ($19) , Rubber caliper sleeve Boot($9), Caliper Piston ( $24), Brake Pad Set ($15) . Shot some brake parts cleaner through it and gave it a coat of black rustoleum and it was as good as new. Oh and new brake braided brake lines. New master cylinder as it was only $10 more for a new one that to rebuild and still needed a new reservoir.
Seems like I spent some $$ I know but good brakes can save your a$$. Oh and when using the blow gun from the compressor to push the piston out of the bore be sure to keep your finger out of the way.
_________________ You don't HAVE to be crazy to run into burning buildings, but it HELPS!
On an XS you won't pass yourself on the road everyday.
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blackwidow Full Member
Joined: Apr 11, 2009 Posts: 394 Location: Colorado
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Posted: October 29, 2009, 5:44 am Post subject: Re: Front Disk Brake Won't Fully Release |
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Yeah I had one do that I endind up bleeding it and it's been fine so far.
_________________ I ride for fun |
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pippend650 Full Member
Joined: Aug 27, 2009 Posts: 10
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Posted: October 29, 2009, 4:01 pm Post subject: Re: Front Disk Brake Won't Fully Release |
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I looked into it and found no blocks in the holes in the master reservoir. Next went down on the caliper and eventually found the piston to be really clogged with crud under the rubber part that seals over it. I think it is sticking. The pads were fine. I'm tempted to just get the whole new caliper from Mikes rather than mess around with it. What do you guys think? I wonder if the caliper where the piston moves in is corroded and then you just have more problems again if it is not all just replaced with new. Again...thanks for everyone's help.
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gordo 650Rider Supporter
Joined: Oct 09, 2008 Posts: 559 Location: CT.U.S.A.
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Posted: October 29, 2009, 4:54 pm Post subject: Re: Front Disk Brake Won't Fully Release |
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Brake's are nothing to f### with. It is not rocket science, but if you've never done any kind of brake work, replacement is probably your easiest option. Having said that, a new piston & rebuild kit from Mike's is allot cheaper then a whole caliper. Generally, the bore in which the caliper sits is ok, the piston's get all the corrosion.And being the bike's are 25 + year's old, rebuilding is a must do. In the manual, it gives pretty clear instruction's on how to do the rebuild. Plus the satisfaction of doing it yourself.Just remember that brake fluid WILL remove any paint it comes in contact with. Just flush with water as soon as possible, to minimize any damage.There are a couple of way's to remove the piston without getting hurt from a flying piston. First is use the master cylinder, just pump the handle with the caliper off the mount's & pad's removed. Might have to refill the reservoir to get the piston all the way out. Another is to use a greasegun with a metric fitting in the hole where the brake line attaches. Anyhow, Good luck on whatever you decide, we're allways here. PS, the braided steel line's are top notch,& cheeper than the rubber line's. They eliminate all the spongyness associated with rubber line's.
_________________ '80 G,
Last edited by gordo on October 29, 2009, 4:56 pm; edited 1 time in total |
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acbanks Full Member
Joined: Mar 21, 2009 Posts: 72 Location: Raleigh, NC, USA
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Posted: October 29, 2009, 4:55 pm Post subject: Re: Front Disk Brake Won't Fully Release |
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It's my understanding the the caliper piston rings are actually responsible for retracting the piston.
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gordo 650Rider Supporter
Joined: Oct 09, 2008 Posts: 559 Location: CT.U.S.A.
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Posted: October 29, 2009, 4:58 pm Post subject: Re: Front Disk Brake Won't Fully Release |
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Bank's, that's true. But it's not ring's per say. The bore has a taper to it where the seal fit's, & that's what retract's the piston slightly.
_________________ '80 G, |
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