Need a proportion valve PN
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Joined: Jun 2015
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From: New Hampshire
Need a proportion valve PN
Trying to replace the proportion valve (distribution block) on my 1975 F250 highboy with drum brakes all around. I'm having a hard time locating a replacement part.
I believe the switch on this valve is bad and giving me a brake light on my dash.
LMC catalog only shows a Prop valve for disc brake system.
Any help in locating one or a part number appreciated
Procedure to recenter the existing one appreciated as well; that may/may not turnoff the light.
Thanks
Tbruz
I believe the switch on this valve is bad and giving me a brake light on my dash.
LMC catalog only shows a Prop valve for disc brake system.
Any help in locating one or a part number appreciated
Procedure to recenter the existing one appreciated as well; that may/may not turnoff the light.
Thanks
Tbruz
Fleet Owner
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From: NorCal
Hotshot
Joined: Apr 2009
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From: Stanley, VA
Actually, for a 4-wheel drum brake system, it's called a pressure differential valve not a proportioning valve.
Pressure differential valve
73-75 F250 4WD
C8TZ-2B257-C
Unfortunately no dealer or obsolete parts supplier has one. If you think it's the switch itself is bad, that can be replaced.
Differential switch
C8AZ-2B264-A
Morton-Shell Ford, West Plains, MO has 1 (417) 256-3193
Rusty Eck Ford, Wichita, KS has 1 (316) 685-9211
Klimesh Motor Sales, Calmar, IA has 1 (563) 562-3241
Autonation Ford, White Bear Lake, MN has 4 (651) 484-7231
There are more dealers that show them in stock.
Pressure differential valve
73-75 F250 4WD
C8TZ-2B257-C
Unfortunately no dealer or obsolete parts supplier has one. If you think it's the switch itself is bad, that can be replaced.
Differential switch
C8AZ-2B264-A
Morton-Shell Ford, West Plains, MO has 1 (417) 256-3193
Rusty Eck Ford, Wichita, KS has 1 (316) 685-9211
Klimesh Motor Sales, Calmar, IA has 1 (563) 562-3241
Autonation Ford, White Bear Lake, MN has 4 (651) 484-7231
There are more dealers that show them in stock.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Actually, for a 4-wheel drum brake system, it's called a brake pressure differential valve not a proportioning valve.
Brake pressure differential valve = 1968/75 F250 4WD = C8TZ-2B257-C
Unfortunately no dealer or obsolete parts supplier has one. If you think it's the switch itself is bad, that can be replaced.
Brake Pressure Differential Valve Warning Lamp Switch = C8AZ-2B264-A / Available from Ford
Brake pressure differential valve = 1968/75 F250 4WD = C8TZ-2B257-C
Unfortunately no dealer or obsolete parts supplier has one. If you think it's the switch itself is bad, that can be replaced.
Brake Pressure Differential Valve Warning Lamp Switch = C8AZ-2B264-A / Available from Ford
Applications: 1968/69 FoMoCo Passenger Cars / 1968/79 F100/350, Bronco and Econoline.
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Joined: Jun 2015
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From: New Hampshire
My local Ford dealer was able to get me the OEM brake pressure switch for $32.00.
Installed it but the dash BRAKE light is still illuminated.
I recently installed new wheel cylinders all around and light came on after that(was not on prior to that repair) even though when I pulled the switch it was crusty and jammed in the up position, that's why I replaced the switch. I will be trying the procedure to center the spool valve today.
Thanks
Tbruz
Installed it but the dash BRAKE light is still illuminated.
I recently installed new wheel cylinders all around and light came on after that(was not on prior to that repair) even though when I pulled the switch it was crusty and jammed in the up position, that's why I replaced the switch. I will be trying the procedure to center the spool valve today.
Thanks
Tbruz
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Ford Parts Specialist
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From: Simi Valley, CA
^ This is C8TZ-2B161-A .. Brake Pressure Metering Valve used on 1968/79 F250 2WD & F350 with disc brakes. I can post a pic of it, if you wish.
C8TZ-2B257-C .. Brake Pressure Differential Valve for 1968/75 F250 4WD with front/drum brakes is shown at the far right as 2B257 in the pic. Its warning lamp switch is shown as 2B264.
C8TZ-2B257-C .. Brake Pressure Differential Valve for 1968/75 F250 4WD with front/drum brakes is shown at the far right as 2B257 in the pic. Its warning lamp switch is shown as 2B264.
Lead Driver
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From: El Dorado, Arkansas
^ This is C8TZ-2B161-A .. Brake Pressure Metering Valve used on 1968/79 F250 2WD & F350 with disc brakes. I can post a pic of it, if you wish. 
C8TZ-2B257-C .. Brake Pressure Differential Valve for 1968/75 F250 4WD with front/drum brakes is shown at the far right as 2B257 in the pic. Its warning lamp switch is shown as 2B264.
C8TZ-2B257-C .. Brake Pressure Differential Valve for 1968/75 F250 4WD with front/drum brakes is shown at the far right as 2B257 in the pic. Its warning lamp switch is shown as 2B264.
The stand-alone Metering Valve has no pressure warning switch sticking out of it but the Pressure Differential Valve does.
On the other hand, this is a stand-alone Metering Valve for the front disc brake circuit on certain applications.
The Pressure Differential Valve again.
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