I recently bought a 1967 F100 with a 69 I6 and no power brakes.
The panel mounted "brake" light stays on whenever the key is on. From searching the forum and going through the original shop manuals, I was assuming that it was either the switch in the pressure differential valve or an issue with a gummed up pdv. Lo and behold, there's no pressure differential valve under the master cylinder.
I'm assuming that there's supposed to be one there, right? Since it isn't, should I add one?
How do I get that damn light off?
Thanks in advance for any advice.
1967 Brake Pressure Differential Valve
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mccolalx
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Busboy
- Blue Oval Fanatic
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Re: 1967 Brake Pressure Differential Valve
It's on the frame rail.
1967 F-100 4x4 custom cab.
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Another 67 F-100 4x4 custom cab.
2016 F-150 Eco-Boost 2.7 liter. (It will smoke the tires!)
1972 F-350 Sport Custom cab & chassis.
1972 F-250 Explorer Special, Camper Special.
1971 F-100 custom. 302, C-4, p.s. p.b. factory 65 amp alternator with transistorized voltage regulator.
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Canonman67
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Re: 1967 Brake Pressure Differential Valve
Between the steering gear box and the radius arm crossmember. 
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Green23
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Re: 1967 Brake Pressure Differential Valve
1968 F-100 Ranger