Jack Posted August 8, 2005 Share Posted August 8, 2005 It is on my GMC........... and no cheating Karoshi :cry: :wink: Quote Link to comment Share on other sites More sharing options...
Jeroen Sleijpen Posted August 8, 2005 Share Posted August 8, 2005 Jack what we have here is an manual electric trailer brake!!! When your truck was used to pull a electric braked trailel eg a M14, then you could brake the trailer alone going down steep hills or brake together with the hydraulic brakes on the GMC. Your M3 halftrack has an electric brake as well...this one is working with a mechanical delay when you press the brake pedal. the 4th wire on your trailer connector is for this electric brake! The black knob is to adjust the sensitivity of the brake according to the load of the trailer. This knob is on the dashboard of your halftrack! So not all of the CCKW's where equiped with this feature! Quote Link to comment Share on other sites More sharing options...
Jack Posted August 10, 2005 Author Share Posted August 10, 2005 Thanks for that. Is it of WW2 vintage? Quote Link to comment Share on other sites More sharing options...
Jeroen Sleijpen Posted August 10, 2005 Share Posted August 10, 2005 Thanks for that. Is it of WW2 vintage? jeps.... this is WWII vintage... but often installed after the war! Quote Link to comment Share on other sites More sharing options...
N.O.S. Posted August 27, 2007 Share Posted August 27, 2007 I know it was a long time ago, but do you still have the electric brake selector knob with Light/Med/Heavy plate, Jack? If so I'd be interested! I'm assuming you removed it from the gmc? Quote Link to comment Share on other sites More sharing options...
abn deuce Posted August 27, 2007 Share Posted August 27, 2007 if you would feel more comfortable with it removed from your CCKW you can always send it to me and I see that it has a good home ! Quote Link to comment Share on other sites More sharing options...
Joris Posted August 28, 2007 Share Posted August 28, 2007 Oh and tell us about your half track too! Quote Link to comment Share on other sites More sharing options...
Tony B Posted August 28, 2007 Share Posted August 28, 2007 Interesting. Means you can tow trailer over 3.5 tons weight, thats the max for a manual overide. But does bring up all the 'Before1960..etc..etc.. Quote Link to comment Share on other sites More sharing options...
Jack Posted August 28, 2007 Author Share Posted August 28, 2007 if you would feel more comfortable with it removed from your CCKW you can always send it to me and I see that it has a good home ! :whistle: still on the GMC :-D Quote Link to comment Share on other sites More sharing options...
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