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Buell Forum » Old School Buell » Archive through August 29, 2015 » Rear brake master cylinder « Previous Next »

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Kalali
Posted on Saturday, August 01, 2015 - 09:21 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

A couple of related issues. The rear brake pedal doesn't bounce all the way back. It also takes a good bit of pressure on the pedal to active the brake light. So I ordered the rebuild kit for the rear brake master cylinder and see if that fixes the issues. Anyone else has had these issues and have rebuilt the master cylinder? Should I have ordered the switch at the same time? Any tips would be welcomed. Thanks.
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Pontlee77
Posted on Saturday, August 01, 2015 - 10:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Did you try bleeding the brake?

With age the liquid gets moisture, and looses properties.
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Oldog
Posted on Saturday, August 01, 2015 - 02:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Kal, consider annual fluid change for the brake fluid.
Lafayette, suggested it to be some years ago, its worked well.
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Maxbuell
Posted on Saturday, August 01, 2015 - 04:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My cylinder was worn and would not hold a seal rebuilt it twice.
Had to buy a new cylinder
American Sport bike (sponsor here ) has them
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Kalali
Posted on Saturday, August 01, 2015 - 06:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks. I change the brake fluid every other year. What I do is open the bleeder screw and run about a pint through by pumping the pedal/lever and catching the fluid on one end and keep pouring on the other end while making sure the reservoir doesn't go empty. I'm thinking maybe the spring in the rear master cylinder is getting a little lazy. Looks like the rebuild kit comes with a new spring. It's not leaking.
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Mmmi_grad
Posted on Saturday, August 01, 2015 - 06:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I would not rebuild it if it is not leaking.

I have experienced a weird feel here in the past like you describe. I unbolted the assembly loose then reattached. It felt 200 times better after that.
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