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Old 08-18-2008, 08:50 PM   #1
DustinJ
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Need help, front brakes locked up on race bike.

I just switched back from a Brembo to my stock master cylinder, and properly bled the system. I took it down the road to make sure everything was okay, and at first it seemed great... but it slowly began to drag until it literally locked up so tight the bike wouldn't move. I opened a bleeder to release the pressure and got the bike back home. I re-bled the system, and bam the same thing happened again. It doesn't instantly lock up, but within two blocks there is enough drag that it won't roll any more. I'm a bit puzzled and any help on this would be greatly appreciated. Thanks.
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Old 08-18-2008, 08:58 PM   #2
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if the only thing changed was that master cylinder, sound like it is the culprit. Was it stored dry? it could have alot of friction and be sticking as you ride.
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Old 08-18-2008, 09:09 PM   #3
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Yeah, it was stored dry. How do I go about cleaning it out, or what's needed now?
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Old 08-18-2008, 09:12 PM   #4
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Not sure about these bikes, but maybe there is a rebuild kit or the piston can be removed and gently cleaned w emerald cloth.

Check an owners manual maybe... your set up would be different then mine. I would assume it is rebuildable.
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Old 08-18-2008, 09:13 PM   #5
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Alright, I appreciate the help. We'll see if I can get it apart and repair it I guess.
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Old 08-18-2008, 09:17 PM   #6
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http://cgi.ebay.com/ebaymotors/06-07...mZ330261863332

looks like if you pull the boot and relieve pressure w the bango bolt and bleeder screw it should come out from the pics.
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Old 08-18-2008, 09:19 PM   #7
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Schweet, I appreciate it. I'm gonna pull the thing of and get my master mechanic Mr. Trevor Berber to work his magic. I can do the basic stuff but when it comes to disassembly, I'll just send it his way. :P
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Old 08-18-2008, 09:23 PM   #8
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DustinJ; afterthought....


when the front brake locks up, is the right lever loose? If the piston is sticking I would expect the plunger lever to not be pushing against the lever, hence making the right lever loose, or pulled closer to the handle w/o holding it
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Old 08-18-2008, 09:28 PM   #9
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No, it's all the way out and it's solid. I can barely pull the lever back, it feels like fluid is getting trapped to me... like the brakes are getting really really tight.
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Old 08-18-2008, 11:03 PM   #10
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Stuck piston. Easy fix- rebuild kit and some time. If you're going to get Trevor to do your work, it should take him about 20 minutes as long as there's parts in the shop.
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Old 08-18-2008, 11:41 PM   #11
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you said :" when brakes locked up-you opened bleeders released pressure and got the bike home" right ??? so i think :1-fluid top off too much in reservoir (no room for heat expan ) 2-may be wrong brakes fluid (imposible).
may be try to see if both calipers lock-up or just 1 side...g/l,keep us updated
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Old 08-20-2008, 08:31 AM   #12
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Quote:
Originally Posted by DustinJ View Post
I just switched back from a Brembo to my stock master cylinder, and properly bled the system. I took it down the road to make sure everything was okay, and at first it seemed great... but it slowly began to drag until it literally locked up so tight the bike wouldn't move. I opened a bleeder to release the pressure and got the bike back home. I re-bled the system, and bam the same thing happened again. It doesn't instantly lock up, but within two blocks there is enough drag that it won't roll any more. I'm a bit puzzled and any help on this would be greatly appreciated. Thanks.
Check that the lever is allowing the master cylinder piston the release all of the way.
If the lever is bent it can stop the piston from returning fully, eventually causing the brakes to lock up entirely.
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Old 08-20-2008, 06:33 PM   #13
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The fluid isn't even at the Upper level, so I don't believe that's it. And also, the lever and master cylinder are exactly as they came off the bike a few months ago and were never crashed or dropped. I disassembled and cleaned it at work today, so we'll see if that helps. I appreciate everyones speedy responses.
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Old 08-20-2008, 06:58 PM   #14
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did u get ALL of the air out?
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Old 08-20-2008, 07:06 PM   #15
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Yeah, I got it all out. I've installed and uninstalled master cylinders before, and bled brakes quite a few times, so I do understand what I'm doing. I've just never had one do this.
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Old 08-20-2008, 07:17 PM   #16
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really rare case/tough but does happen i still think any posisible causes.... can't be lines may ruptured inside,clogged inside.did you try to see 1 or both calipers lock up ??? i'd love experience this but too far away between us plus weather not good
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Old 08-20-2008, 07:30 PM   #17
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Well, so far I reinstalled my master cylinder and brake lines. Which I took to work, completely disassembled and cleaned all parts... also cleaned and blew out brake lines. I drained the fluid, cleaned the resevoir, and added new fluid once everything was installed. Sat out in the garage with a Mityvac and regular bleeding, and so far very little fluid has been removed from the resevoir and nothing in the MC. I unbolted the brake lines and nothing has even run out. I figure at this point it's beyond me, so like I said... it's going to Trevor's. :P
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Old 08-26-2008, 11:01 PM   #18
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I got it all square away, thanks to all that helped.
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Old 08-26-2008, 11:03 PM   #19
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What was wrong with it?
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