Just replace them quickly one at a time and put a rag underneath the
MC.  The fluid loss should be minimal (as long as you are stomping on
the brakes at the same time) and I don't remember having to bleed the
system afterward either.  The key is to not touch the brake pedal while
replacing and you should be fine.  If you feel softness in the pedal
afterward then you should definately bleed the system but I never
remember having to do this.

Hope this helps.

Ken Wilford
John 3:16
www.vanagain.com

Mark Thoma wrote:
> Hey all,
> Is there a mess free way to replace the two brake light switches on the master cylinder?
> It looks like I'd have to drain the entire system then replace switches, then refill and bleed the brakes.  What a pain.
> Thoma
>
>
>
>
>
>
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