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Dxg
Posted on Monday, March 29, 2021 - 12:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It looks like I may need to replace my rear brake light switch. It screws into the master cylinder. Is it a pressure switch, and if so will I need to bleed the system after replacing it?
In other words, will I let air into the master cylinder when I remove the switch?
2008 1125R

(Message edited by dxg on March 29, 2021)
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Oldog
Posted on Monday, March 29, 2021 - 12:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yes its a pressure switch,
I would recommend the bleed
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Dxg
Posted on Monday, March 29, 2021 - 08:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Got it. Thank you.
Follow-up question for anyone who has replaced the switch. Will fluid weep out when you remove the switch? Is it better to empty the reservoir/cylinder first? I hate to have brake fluid dripping everywhere.
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Jj5cool1
Posted on Monday, March 29, 2021 - 10:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yes it will pretty much pour out. I recommended draining it and having water ready to rinse off any brake fluid that spills on painted surfaces. And yes you’ll need to bleed it afterwards.

Here is a link to the Buell repair manuals:
https://www.twinmotorcycles.nl/artikelen.asp?cid=6 &aid=1228
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1125rz
Posted on Tuesday, March 30, 2021 - 02:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Put a plastic bag between reservoir & cap . Will help a little
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