I also found that the positive power lead going into that hydraulic
switch is an excellent source to tap, for a wire connection to an
engine-bay light (identical to the ones for 240-Z's, you can get for
about 10 bucks). My engine-bay light is mounted on the top coil-bracket,
fits perfectly there. There are two wire posts on top of the hydraulic
switch. Test for the one connected wire having positive power, and
install a tap-wire connection for a light. Using the engine-bay light is
a good way of testing that you have solid power to the hydraulic switch.
The other wire lead on the hydraulic switch finds it's way to the rear
brake lights.
Fred - So.SF
'66 2L Lucy
-----Original Message-----
From: owner-datsun-roadsters@autox.team.net
[mailto:owner-datsun-roadsters@autox.team.net] On Behalf Of John F
Sandhoff
Sent: Wednesday, June 15, 2005 6:42 PM
To: Tom @ Datsun2000
Cc: datsun-roadsters@autox.team.net
Subject: RE: Brake Switch ?
> The switch of which you speak is tripped by an imbalance of pressure
> between the front and rear braking systems.
Later cars have a dual master reservoir and the differential switch
of which you speak. The brake lights are activated by a pushbutton-
style switch mechanically activated by a tab on the brake pedal,
up and under the dashboard.
Earlier cars have a single master reservoir and a hydraulic switch
to activate the brake lights. This hydraulic switch is screwed
into the distribution manifold. It is not a differential switch, though
it can be mistaken for one. This also means that there is no mechanical
switch activated by the brake pedal.
-- John
John F Sandhoff sandhoff@csus.edu Sacramento, CA
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