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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Brakes » Archive through June 21, 2007 » 1997 S3 Front Brake Service « Previous Next »

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Ulywife
Posted on Tuesday, May 08, 2007 - 05:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

This was originally posted by S3tbolt, however, when I attempted to move it, things didn't go as planned. Nonetheless, here is his question.

My S3 is 10 years old, well maintained, brake fluid flushed once a year. This year the front got mushy, I can almost pull the front lever to the grip. I'm thinking the master cylinder is toast. I've reflushed the system and still same problem.

Any thoughts.
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Naustin
Posted on Wednesday, May 09, 2007 - 09:18 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well, it is either the Caliper, the Brakeline, or the Master cylinder...

Have you checked the banjo bolt between the Master cylinder and the Brakeline? Maybe it vibrated loose?
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S3tbolt
Posted on Friday, May 11, 2007 - 12:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Everything is good and secure, all contact surfaces clean and fluid free. I'm just wondering because of the age and DOT 5 fluid the internal rubber parts have taken a beating. As I understand DOT 5 is very hard on internal brake components.
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Josh_
Posted on Friday, May 11, 2007 - 12:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

That does have steel-braided brake lines?

You might ask a good shop (ie crotch rocket shop) to bleed it for you. That's usually my issue with brakes.

Failing that, I'd rebuild the caliper and master cylinder. Parts shouldn't cost too much.
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Ara
Posted on Saturday, May 12, 2007 - 08:29 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

S3bolt, do a search for Henrick's really clever brake bleeding procedure using a large medical syringe. It's easy, fast, and it works like a charm.
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S3tbolt
Posted on Wednesday, May 16, 2007 - 05:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

We can close this thread, I've rebuilt the brakes. As I suspected Master cylinder was bad, and now the system had that rock solid feel restored. I figured out a clever way to remove the caliper pistons too with little effort...
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