Whats the plug for? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GmtGmt · 10-15-2010, 05:45 PM

Whats this plug with a bracket on for?
its on my Brake proportioning valve

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Thanks
Thomas

Jonboy · 10-15-2010, 06:14 PM

I am pretty sure that is the low pressure switch. It will turn on the red "brake" light on that's in the dash cluster.

joe231 · 10-15-2010, 06:47 PM

It is a pressure differential switch. As long as there is pressure in both brake circuits the internal pin inside the proportioning valve is centered and floats, a loss of fluid in one of the circuits will move the pin to ground completing the circuit and making your brake light come on as Jon said. It is just a warning that there is a leak in the system

10-15-2010, 06:14 PM	#2
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Whats the plug for? I am pretty sure that is the low pressure switch. It will turn on the red "brake" light on that's in the dash cluster. __________________ 1974 Jimmy- 5.3/4L80e/NP241

10-15-2010, 06:47 PM	#3
joe231 Registered User Join Date: Dec 2007 Location: Palmer, Alaska Posts: 13,821	Re: Whats the plug for? It is a pressure differential switch. As long as there is pressure in both brake circuits the internal pin inside the proportioning valve is centered and floats, a loss of fluid in one of the circuits will move the pin to ground completing the circuit and making your brake light come on as Jon said. It is just a warning that there is a leak in the system __________________ *CHEVY ONLY*



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