The gismo light has in fact two functions:
1 = Brake differential warning indicator lamp
2 = Pressing this unit activates a test of this lamp
1 is activated, if there occurs a pressure difference between the two
hydraulic brake circuits.
This happens when one circuit is leaky.
In my 1971 BGT the switch is defect and NLA - so there is no function.
The white handle does not ring a bell.
Cheers,
Hans
----- Original Message -----
From: <RampantNM@aol.com>
To: <MG-MGB@yahoogroups.com>; <mgs@autox.team.net>
Sent: Friday, February 01, 2008 10:18 PM
Subject: [Mgs] MGB Question
> Last weekend as I piddled with the B, I was under the dash, sort of,
> trying
> to get the headlight switch back together so the light from it did not
> show
> through the brake test gizmo, and I found a 6-8 inch steel rod, with a
> white
> plastic handle hanging down out of the darkness.
>
> What is this? I thought maybe the cowl vent? but I could not move it in
> any
> direction. I do have part of the dealer installed air conditoner in the
> way.
>
> Also, that brake test gizmo...how important is that. I've had them on
> Midgets and such before, but never truly understood their funtion and
> use. I'm
> thinking I could add a clock or something in that space.
>
> Regards,
>
> Robert B. Houston
>
> 74.5 MGBGT
> 73 MG Midget
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