Proportioning valve
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Proportioning valve
Dug on old '81 out from behind a barn. Brakes were locked up. In trying to free them the brake light came on. Gave up on freeing things up and did a full brake job including master cylinder. Everything bled okay and brakes seem to work fine. However, the brake light is still on. It goes out when I disconnect the wires at the proportioning valve. I followed the manual on re-centering the PV and the light is still on. Interestingly when I bled them I did not have to pull the pin on the PV to bleed the back as some info suggested I might. I'm suspecting I need to replace the PV. Any thoughts? Am I missing something? Has anyone installed an aftermarket PV? OEM PVs are discontinued.
FTE Chapter Leader
Joined: Feb 2004
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From: Wayland, MI
I have not seen one of these valves in a while, is the sensor something you can remove and maybe see if it is stuck or is it part of the housing. Maybe search pick and pulls to see if there is a similar year truck and grab one from there also
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Doesn't appear to be any kind of sensor that can be replaced. May look at a junkyard but worried I'll just get another bad one. I'll probably try one of the aftermarket ones. Was just hoping someone may have some experience....
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Dug on old '81 out from behind a barn. Brakes were locked up.
In trying to free them, the brake pressure differential valve's warning light came on. Gave up on freeing things up and did a full brake job including master cylinder.
Everything bled okay and brakes seem to work fine. However, the brake pressure differential valve warning light is still on.
It goes out when I disconnect the wires at the valve. I followed the manual on re-centering the PV and the light is still on.
Replace the brake pressure differential valve's warning lamp switch, it's defective (so what else is new!?).
In trying to free them, the brake pressure differential valve's warning light came on. Gave up on freeing things up and did a full brake job including master cylinder.
Everything bled okay and brakes seem to work fine. However, the brake pressure differential valve warning light is still on.
It goes out when I disconnect the wires at the valve. I followed the manual on re-centering the PV and the light is still on.
Replace the brake pressure differential valve's warning lamp switch, it's defective (so what else is new!?).
MSRP: $35.56 / FTE Ford Dealer Parts Dept sponsor horizonpartsguy.com online price: $23.86 / Horizon Ford ~ Seattle (Tukwila) WA
This switch is plastic (and a notorious POS!), threads into the valve, 2 wires connect to it. Some people call this a proportioning valve, but as you can see, FoMoCo did not.
Applications: 1980/89 F100/350, Bronco & Econoline / 1990/96 F250/350 & F(Super Duty) / 1997 F350 // 1997/2001 Econoline* // Misc: 1975/79 FoMoCo Passenger Cars // 1980 Lincoln Versailles.
*Switch was probably was used after 2001 on Econolines (aka E Series), but my latest Ford truck parts catalog only covers 1990/2001.
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Double good news! It was in fact the sensor and I was able to remove and clean it. Light's out and everything working good. Now it's time to change out the bushings on the clutch and brake pedal assembly.
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