Brake Light On The Dash ?
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Junior User
Joined: Oct 2018
Posts: 68
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From: Monroe NC
Brake Light On The Dash ?
Im redoing a 73 highboy and chasing some electrical gremlins around in the system. The issue right now is the emergency brake light stays on. The truck had awful brakes so I replaced the entire brake system except the master cylinder and booster. I have bled the system three times and gotten the soft pedal out. There is no switch on the Ebrake. Whats up ?
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
C8AZ-2B264-A .. Brake Pressure Differential Valve Warning Lamp Switch / Obsolete - Available NOS & from auto parts stores.
This switch threads into the valve (some peeps call it a proportioning valve), located below the master cylinder on the frame rail.
Applications: 1968/69 FoMoCo Passenger Cars // 1968/79 F100/350, Bronco & Econoline.
This switch threads into the valve (some peeps call it a proportioning valve), located below the master cylinder on the frame rail.
Applications: 1968/69 FoMoCo Passenger Cars // 1968/79 F100/350, Bronco & Econoline.
Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
Wouldn't it be incorrect when people refer to it as a proportioning valve? These trucks were four corner drum and the differential valve is just to show when system pressure isn't equal. The trucks with disc brake did use a 60/40 proportioning valve.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
More Turbo
Joined: Apr 2007
Posts: 656
Likes: 5
From: Salisbury, PA
If you take out the electrical part of the brake pressure switch from the proportioning valve there is a little "shuttle" that moves. It has a detent that will engage the switch and light up the light on your dash. You may need to take a tiny screw driver to move it back to center. It often does not return on its own when just bleeding the brakes.
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