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Technical Discussion Forum For the discussion of technical questions about Professional Cars and their repair and maintenance. Posting in this forum is limited to PCS Members and / or Site Supporters. We encourage all website users to become members of the Professional Car Society and / or become Site Supporter.

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Old 11-29-2013, 11:35 AM
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Kevin Lynch Kevin Lynch is offline
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Default Tracking down brake wires

Re: American LaFrance fire truck w/ air brakes....the brake lights don't come on. The bulbs are fine; the directionals are fine. Trying to get a look at the brake mechanism from under the truck is tough as the steering mechanism is huge do to the front wheels being behind the driver.
Any suggestions on where the wires come out of??????
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Old 11-29-2013, 02:24 PM
John Royark JR John Royark JR is offline
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Cant speak for these, but the old cars have the brake light wires and switch coming out of the master cylinder, and go out fairly regular. Worth a check
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Old 11-29-2013, 07:10 PM
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on that it would be most lily a trip switch that the pedal would work a leaver on. so state inside and go to the out it would be mounted were it could be tripped by the heavy iron
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Old 11-29-2013, 07:50 PM
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Default Lights

Quote:
Cant speak for these, but the old cars have the brake light wires and switch coming out of the master cylinder, and go out fairly regular. Worth a check
I have not worked on anything with air brakes past the 70,s .But all of them had a switch like the pic below somewhere in a application line usually under the dash. The switch activates with air pressure same idea as using hydraulic pressure on some cars.
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