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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@autox.team.net] On Behalf Of
WeslakeMonza1330--- via Spridgets
Sent: Saturday, May 02, 2015 6:28 AM
To: spridgets@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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<div class=3DSection1>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I would try to bleed suspected air =
from
the switch by loosening and tightening it while someone steps on the =
brake
pedal. <o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>If that doesn’t work, replace =
the
switch and bleed it. <o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>If that doesn’t work, go on =
with
what you want to do. Bill in <st1:State w:st=3D"on"><st1:place =
w:st=3D"on">Oregon</st1:place></st1:State><o:p></o:p></span></font></p>
<div>
<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>
<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>
</span></font></div>
<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> =
Spridgets
[mailto:spridgets-bounces@autox.team.net] <b><span =
style=3D'font-weight:bold'>On
Behalf Of </span></b>WeslakeMonza1330--- via Spridgets<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Saturday, May 02, =
2015 6:28
AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
spridgets@autox.team.net<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> [Spridgets] =
Brake light
switches - hydraulic and non-hydraulic =
types</span></font><o:p></o:p></p>
</div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'>Hi =
list,<o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>=
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'>A bunch of spridgetly brake light =
switch
questions:<o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>=
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'>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.<o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>=
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'>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.<o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>=
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'>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.<o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>=
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'>Other =
questions:<o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>=
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'>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?<o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>=
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'>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).<o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>=
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'>Anyone done this and any comments =
on
switch life or anything else whatsoever?<o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>=
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'>Thanks<o:p></o:p></span></font></p>=
</div>
</div>
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