| Brake Switch Repair [message #283066] |
Fri, 24 July 2015 20:48  |
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thainglo
Messages: 132
Registered: March 2015
Location: Iowa
Karma: 2
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Senior Member |
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I'm troubleshooting my oem cruise control, failed at e first step with no power off of brake switch. Without thinking about it, I ordered a replacement (AC Delco D850a, not listed in parts interchange but it looks to fit). When it showed up, I pulled the original part and saw it could be disassembled. Figuring I had nothing to lose, popped the tabs and investigated.
Turned out to be just enough corrosion on the contact points to prevent a good connection. A few invites with a wire brush and needle file worked wonders. As good as new!
Took a few tries wi the multimeter to confirm I had the switch positioned again correctly in relation to the brake lever. Probably last another 40 years now and I get to return the AC Delco part.
Pics of of the disassembled part here:
http://www.gmcmhphotos.com/photos/brake-switch-repair/p58565-image288.html
Matt Sladek
1976 Eleganza II
Coralville, IA
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| Re: Brake Switch Repair [message #283073 is a reply to message #283066] |
Fri, 24 July 2015 22:03  |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Mark
Well done -- thanks for the info --
Dennis
thainglo wrote on Fri, 24 July 2015 20:48I'm troubleshooting my oem cruise control, failed at e first step with no power off of brake switch. Without thinking about it, I ordered a replacement (AC Delco D850a, not listed in parts interchange but it looks to fit). When it showed up, I pulled the original part and saw it could be disassembled. Figuring I had nothing to lose, popped the tabs and investigated.
Turned out to be just enough corrosion on the contact points to prevent a good connection. A few invites with a wire brush and needle file worked wonders. As good as new!
Took a few tries wi the multimeter to confirm I had the switch positioned again correctly in relation to the brake lever. Probably last another 40 years now and I get to return the AC Delco part.
Pics of of the disassembled part here:
http://www.gmcmhphotos.com/photos/brake-switch-repair/p58565-image288.html
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Brake Switch Repair [message #283074 is a reply to message #283066] |
Fri, 24 July 2015 22:32 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Matt,
Just to reassure you, I did the same thing about 10 years ago & the switch
is still working perfectly.
Pays to be cheap: :-)
Who else would do something like this?:
http://www.gmcmhphotos.com/photos/g3489-repair-leaking-oil-pressure-sender.html
Ken H.
On Fri, Jul 24, 2015 at 9:48 PM, Matt Sladek wrote:
> I'm troubleshooting my oem cruise control, failed at e first step with no
> power off of brake switch. Without thinking about it, I ordered a
> replacement (AC Delco D850a, not listed in parts interchange but it looks
> to fit). When it showed up, I pulled the original part and saw it could be
> disassembled. Figuring I had nothing to lose, popped the tabs and
> investigated.
>
> Turned out to be just enough corrosion on the contact points to prevent a
> good connection. A few invites with a wire brush and needle file worked
> wonders. As good as new!
>
> Took a few tries wi the multimeter to confirm I had the switch positioned
> again correctly in relation to the brake lever. Probably last another 40
> years now and I get to return the AC Delco part.
>
> Pics of of the disassembled part here:
> http://www.gmcmhphotos.com/photos/brake-switch-repair/p58565-image288.html
> --
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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