Brake warning light
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Junior User
Joined: Jun 2013
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Brake warning light
I have a red "Brake" warning light illuminated in the cluster of my 75 HighBoy. The diagrams show a "Low Brake Switch" but there isn't anything on my master cyl or parking brake. Any ideas?
Cargo Master
Joined: Oct 2010
Posts: 3,417
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Follow the master cylinder lines down to the frame. There should be a proportioning valve there. The brake warning switch is on that prop valve. That light activates when you have a pressure differential in the lines front vs rear.
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Junior User
Joined: Jun 2013
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Sure'nuff. Danged near invisible, but its there. The brakes felt ok the little bit I drove it to get it home, may just start by pulling one at the junkyard to swap. It sits pretty close to the headers. I'm thinking the heat might have killed it.
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