Try taking the switch out. The brake fluid probably won't leak.
See if the switch will cause the light to light up with it
connected and grounded to the cylinder or other good ground. If
so then the switch is bad. If not then the piston is probably not
centered. Try to get a look into the hole and see if you see a
groove and try to gently pry it into a centered position without
buggering it up at the edges.
Mind you this is all conjecture as I have never had one of these
so I have no idea if this is the way the thing works, just
thinking that's the way I would engineer such a system and the
way I would try and figure out the problem if I had one.
Manfred
tyee165 via Mercedes wrote:
Yes. I had the original master cylinder totally apart and if I remember
correctly there is a 2nd smaller bore with a piston that has a notch that
causes the switch to move back or forward sort of like a toggle. I ended up
with a new or rebuilt master cylinder but I think I reused the electric switch.
That may be the issue. No idea if it is available. When this subject came up I
wondered if I might also have a switch on the brake pedal too.
Sent from my Galaxy Tab® A
-------- Original message --------From: Max Dillon via Mercedes <mercedes@okiebenz.com> Date: 2017-01-18 6:17 PM (GMT-06:00) To: Mercedes Discussion List <mercedes@okiebenz.com> Cc: Max Dillon <dillonm...@gmail.com> Subject: Re: [MBZ] Brake Light on (was Best Axle Choice)
If I recall correctly, Randy has brought up this issue before. His car's master cylinder has an extra sensor for the front-rear circuit's pressure differential, and that is the warning light.
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