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Buell Forum » Old School Buell » S2 Thunderbolt » Archive through December 01, 2014 » Reclaiming s2 # 1136 « Previous Next »

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Archive through May 26, 2014Cheese30 05-26-14  08:14 pm
Archive through December 05, 2013Cheese30 12-05-13  10:37 am
         

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Ratbuell
Posted on Monday, May 26, 2014 - 09:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Rebuild the master cylinder, it sounds like it isn't releasing like it should.
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Cheese
Posted on Tuesday, May 27, 2014 - 10:57 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks. I read an earlier thread that there are no rebuild kits available for this MC.

I can pull it apart and clean it out.

Is there a rear brake set up from another model that will bolt up?

I had a caliper problem on my old BMW and it turned out that old Guzzis use the same brembo part and it was cheaper and easier to source.

Is there any carry over like this that you are aware of for rear brakes on the buells?

Thanks again for the ongoing advice.
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Lynrd
Posted on Tuesday, May 27, 2014 - 11:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I was able to find a new S2 Master cylinder under the HD part number about two months ago - i think from either New Castle or Surdyke.

Later style calipers will fit if you change the hanger bracket as wel.
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Lynrd
Posted on Tuesday, May 27, 2014 - 09:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

There is a repair kit listed in the parts catalog as well

41781-94Y - Master Cyl Assembly
45073-94Y - Repair kit
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Cheese
Posted on Wednesday, May 28, 2014 - 05:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks Lynrd
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Cheese
Posted on Thursday, June 12, 2014 - 12:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Told by parts department at local hd/buell store that parts are unavailable. This was after they made an effort and checked the computer. Here is hoping that opening it up and cleaning burnout does the job.
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Phelan
Posted on Thursday, June 12, 2014 - 01:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The rear brake is a Brembo setup used on several different bikes. I would seek contact with them directly about finding a rebuild kit.
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Basti
Posted on Thursday, June 12, 2014 - 03:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

older KTM like LC4 used the same rear brake and if I remember correct also the Aprilia Moto6.5
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Cheese
Posted on Friday, June 13, 2014 - 09:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks for the heads up
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Screamer
Posted on Sunday, June 15, 2014 - 10:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Try Lance at St. Paul Harley-Davidson. He carries a lot of items that they don't list on their website or EBay.
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Cheese
Posted on Monday, August 11, 2014 - 04:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well, I thought I had it sorted, but wet on a longer ride and had brake binding again.

I decided to redo the entire rear brake system:

rebuilt the master cylinder - some mild residue.

Brand new brake line.

Cleaned the rear light switch - was not functioning (rear light dims with rear brake pedal). There was a lot of residue in the switch.

New to the bike rear caliper. free moving pistons, excellent shape.

New brake pads.

I rebuilt and bled the system today using DOT 5 fluid (correct from what I have read). I rode the bike for 30 minutes, all under 40 miles an hour and did not press the brake pedal once.

There was no brake binding - and in the past it would happen well before 30 minutes. However, the rear disk was hot to touch at the end of the ride. I understand some pad drag is normal, but I didn't think the disk should be hot. Does this sound correct to anyone else?

Any insight would be helpful.

Cheers
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Essmjay
Posted on Tuesday, August 12, 2014 - 10:22 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Any chance the rotor is warped or misaligned? Caliper alignment bolt is in the right hole on the swingarm?
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S1owner
Posted on Tuesday, August 12, 2014 - 05:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My S1 would do this the only way I got rid of it was I went with a pm 6 piston caliper in the rear.
What it would do is build pressure but would not release treid everthing rebuild etc it would seam to be fine but after 30 min or so of riding and using the brake it would just keep building pressure but not releasing.
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Cheese
Posted on Wednesday, August 13, 2014 - 06:18 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Anything is possible. I will check the caliper alignment, rotor, etc. though I don't think this is the problem as there is no catch point or friction point as it is up on a stand. The wheel spins fine. It is only after riding that the problem happens. And it is not a small problem. We are talking smoking pads high heat, rear brake engaged kind of binding. The old caliper is gone. The new one on there has not been hot. I would like to keep it that way.

I think a new rear brake system may be the only solution if this fails - it is mostly new anyway.

I would love to hear more about what you used for a replacement caliper, master, etc.

My last question is: why DOT5? Could this be a problem that can be solved with a different fluid? Are the properties of dot5 and dot4 significant enough to warrant a try?
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Cheese
Posted on Wednesday, August 13, 2014 - 06:23 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

One final point. When I bought the bike there was no report from the prior owner that the back brake was a problem.

Of course the back brake didn't really do anything when I purchased the bike. The fluid was low and dirty and not purple (dot5?), but golden (dot4?). The problem started aFter I replaced the fluid and bled the lines, etc. I also did no try to ride it for any longer period of time until I had some feel in the brakes (after they were serviced). Before someone suggests that the two fluids gelled and ruined my system. All the parts on the current system are new and have only seen dot5 fluid.

(Message edited by Cheese on August 13, 2014)
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S1owner
Posted on Wednesday, August 13, 2014 - 06:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Here is what I had it is rare only seen one other PM caliper and bracket
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