A question for experts
Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
Ok then what is the point of the sliding valve in the proportioning valve?
I think you are only partialy correct. Yes I understand that there is a split master cylinder. Older cars and trucks used to run without a prop valve. The prop valve lessens the pressure to the rear brakes under normal conditions and is also a failsafe switch. When there is a pressure differential beyond a certain point it flips the valve and turns on the brake warning light.
I think you are only partialy correct. Yes I understand that there is a split master cylinder. Older cars and trucks used to run without a prop valve. The prop valve lessens the pressure to the rear brakes under normal conditions and is also a failsafe switch. When there is a pressure differential beyond a certain point it flips the valve and turns on the brake warning light.
I have 405 hours of NATEF certified training under my belt, concentrating in brakes and electrical. I have a pretty good idea of what I'm talking about.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
The warning lamp switch used on everything in 1967 (C7AZ-2B264-A), is 1967 only.
Why 1969 Econoline and not 1968? Because, there is no such thing as a 1968 Econoline. While introduced in February 1968, FoMoCo referred to them as 1969's from the get go.
More Turbo
Joined: Dec 2010
Posts: 619
Likes: 0
From: Liberty Hill, Tx
That picture is not a proportioning valve though, so what you are saying is 100% correct about it, our trucks have a proportioning valve built in to those, the whole thing is called a combination valve, the proportioning valve is what delays the rear brakes from being applied
More Turbo
Joined: Dec 2010
Posts: 619
Likes: 0
From: Liberty Hill, Tx
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