[Spridgets] Brake light switches - hydraulic and non-hydraulic types

[corvallis at peoplepc.com]

I would try to bleed suspected air from the switch by loosening and
tightening it while someone steps on the brake pedal. 

If that doesn't work, replace the switch and bleed it. 

If that doesn't work, go on with what you want to do.  Bill in Oregon

  _____  

From: Spridgets [mailto:spridgets-bounces at autox.team.net] On Behalf Of
WeslakeMonza1330--- via Spridgets
Sent: Saturday, May 02, 2015 6:28 AM
To: spridgets at autox.team.net
Subject: [Spridgets] Brake light switches - hydraulic and non-hydraulic
types

 

Hi list,

 

A bunch of spridgetly brake light switch questions:

 

The brake light switch on my 69 Sprite is hydraulic and if I gave the pedal
a good hard push works fine and the brake lines come on.  However, if I
'dab' the brake pedal or press slowly the brake lights don't come on.

 

Is the reason for this poor switch action due to air being trapped right
behind the switch sensor or is that unlikely/not possible with any air being
purged when I last bled the brakes, noting the brake pedal is good and firm.
Or is the problem I'm experiencing simply due to the switch going bad and
needs replacing.

 

I had decided to simply buy a new non-hydraulic/mechanical switch and since
I have both a later pedal box with provision for the mechanical switch and
the later 'hammer head' brake pedal to go with it.  However, having ordered
a switch last night but not looked at the pedal box until a moment ago I
hadn't realized that fitting the mechanical switch requires the pedal box to
be removed.

 

Other questions:

 

If I do fit the mechanical switch and want to remove the hydraulic switch
does anyone know what thread it is?  I'm guessing it's BSPT and that I'll
have to plug it with NPTF - but which BSPT and NPTF?

 

If I want to replace the 4 way union altogether I see I can use the 3H424
later 3 way union from a later car which is also the same as the one fitted
to the rear axle (I have a spare).

 

Anyone done this and any comments on switch life or anything else
whatsoever?

 

Thanks

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