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Buell Motorcycle Forum » Old School Buell » Archive through July 10, 2009 » Front brake won't release « Previous Next »

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Badsix2
Posted on Wednesday, July 08, 2009 - 12:37 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

i have a 96 si and my front brake won't release. if i open the bleeder it will release, but as soon as i use the brake it allmost locks up. i took the handle of thinking that the master cyl wasn't coming all the way back, but it still won't work. any body got an idea where to start on this problem. thanks
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12mpghwy
Posted on Wednesday, July 08, 2009 - 02:07 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

rebuild the master cylinder
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Sloppy
Posted on Wednesday, July 08, 2009 - 04:37 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Likely a piece of dirt in the return port of the master cylinder. Could also be the caliper seals, but I'd go with 12mpg as a start.

You have been replacing the brake fluid frequently...?
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Limitedx1
Posted on Wednesday, July 08, 2009 - 02:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

just contact American Sport Bike and get yourself a master cylinder and caliper rebuild kit. it is a very simple job and is well worth the little bit of cash for new stuff.
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Lake_bueller
Posted on Wednesday, July 08, 2009 - 05:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Have you recently done anything to the brake system (new fluid, etc)? I had a big problem with my rear brakes when I added the rearsets to my S1W. It was a bitch to get all the air out of the lines. I'd start with the simplist and cheapest (brake fluid) and then work up from there.
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Badsix2
Posted on Wednesday, July 08, 2009 - 11:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

got it working for now, i opened the bleeder and pushed the pistons back then flushed the system. i think it ok. thanks every one
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Bad_karma
Posted on Wednesday, July 08, 2009 - 11:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Jay
Probably wouldn't hurt to rebuild the PM caliper while you have the system dry. What does the fluid in the master cylinder look like?
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F_skinner
Posted on Wednesday, July 08, 2009 - 11:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I think you should rebuild your caliper. It sounds like you may have a bit of brake dust that worked its way into the caliper. The problem will return.
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Badsix2
Posted on Thursday, July 09, 2009 - 12:37 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

for shure going to get a kit coming is the master cyl rebuildable my service man. say's its not
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Sparky
Posted on Thursday, July 09, 2009 - 01:49 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Sounds like the pistons in the caliper are hanging up and are not retracting enough to release their grip on the rotor. What happens is that dirt/debris can build up behind the pistons, hardening enough to keep the pistons from retracting.

I've fixed this problem in the field by literally forcing the pistons back. Take a flat blade screwdriver and position it between one brake pad and the rotor and give it a gentle twist. Then do the same for the other pad.
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Badsix2
Posted on Thursday, July 09, 2009 - 08:10 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

sparky thats just what i did it works now i'am going to take it for a short test ride today thanks
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Sloppy
Posted on Thursday, July 09, 2009 - 11:24 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Don't take the risk - rebuild the caliper and mc. It will likely happen again - and hopefully not when Murphy is around...
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Bad_karma
Posted on Thursday, July 09, 2009 - 10:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I have experienced the front brake lockup at speed on I95 still an exciting even after nine years.
Joe
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