Brake proportioning valve
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Senior User
Joined: Dec 2013
Posts: 348
Likes: 4
From: Bakersfield,CA
Brake proportioning valve
From previous posts noticed the 73-74 brake proportioning valve has a different part number than the 1975-1979 brake proportioning valve.
The proporting valve on my 1973 has a pin with a spool on the end that is pulled out to bleed the front disc brakes. Have wraped a tie wire around the spool with a weight attached to the wire to pull out the pin, since the pin is vertical orientation.
The proportioning valve bleeder pin on my 1976 is different than the 1973 bleeder pin. The 1976 pin must be push inward to bleed the front disc brakes. The pin is horizontal orientation. The 1976 proporting valve bleed pin is supposed to covered by a rubber boot.
Have also noticed the aftermarket replacement proportioning valves for 73-79 are modeled after the 1975-1979 style.
Question:
Has anyone figured out how to push in the bleeder pin, work the brake pedal and bleed the front disc brake caliper all at the same time without a three man crew?
Seems like a special bleeder tool is required for the later style proportioning valve when bleeding the front disc calipers.
The proporting valve on my 1973 has a pin with a spool on the end that is pulled out to bleed the front disc brakes. Have wraped a tie wire around the spool with a weight attached to the wire to pull out the pin, since the pin is vertical orientation.
The proportioning valve bleeder pin on my 1976 is different than the 1973 bleeder pin. The 1976 pin must be push inward to bleed the front disc brakes. The pin is horizontal orientation. The 1976 proporting valve bleed pin is supposed to covered by a rubber boot.
Have also noticed the aftermarket replacement proportioning valves for 73-79 are modeled after the 1975-1979 style.
Question:
Has anyone figured out how to push in the bleeder pin, work the brake pedal and bleed the front disc brake caliper all at the same time without a three man crew?
Seems like a special bleeder tool is required for the later style proportioning valve when bleeding the front disc calipers.
Elder User
Joined: Jun 2012
Posts: 850
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From: Florida
How do you hook this up for the brake warning light, if at all? The directions say that the terminal at the front is a brake light switch.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
The warning light is useless.... it's today's equivalent of a check engine light.
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,189
Likes: 5,792
From: S/W Missouri, Polk county
Here is what I have on the pro valve. In or out on the button all depends on GVW, says one book I have.
I think on a push in button pro valve, 1st bleed sys, then push in button to center the floating piston...??
I think on a push in button pro valve, 1st bleed sys, then push in button to center the floating piston...??
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
Brake Pressure Differential Valves (all are obsolete):
C8TZ-2B257-B = 1968/74 Bronco / 1968/75 F100 4WD / 1975 F150 4WD
C8TZ-2B257-C = 1968/75 F250 4WD
C8TZ-2B257-G = 1968/73 F250 2WD with dual piston caliper disc brakes & F350.
D3TZ-2B257-A = 1973/74 F100 2WD / 1973/74 F250 2WD with single piston caliper disc brakes.
D4TZ-2B257-A = 1974/78 F350 / 1974/79 F250 2WD with dual piston caliper disc brakes / 1979 F350 2WD
D5TZ-2B257-B = 1975/79 F100/150 2WD & E100/150 / 1975/79 F250 2WD with single piston caliper disc brakes / 1976/79 F100/150 4WD & Bronco / 1976/79 F250 4WD / 1979 F350 4WD
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
C8AZ-2B264-A .. Brake Pressure Differential Valve Warning Lamp Switch / Available from Ford.
1968/79 F100/350, Bronco & Econoline / 1968/79 misc Passenger Cars.
Note: The valves and the switch used in 1967 are 1967 only.
C8TZ-2B257-B = 1968/74 Bronco / 1968/75 F100 4WD / 1975 F150 4WD
C8TZ-2B257-C = 1968/75 F250 4WD
C8TZ-2B257-G = 1968/73 F250 2WD with dual piston caliper disc brakes & F350.
D3TZ-2B257-A = 1973/74 F100 2WD / 1973/74 F250 2WD with single piston caliper disc brakes.
D4TZ-2B257-A = 1974/78 F350 / 1974/79 F250 2WD with dual piston caliper disc brakes / 1979 F350 2WD
D5TZ-2B257-B = 1975/79 F100/150 2WD & E100/150 / 1975/79 F250 2WD with single piston caliper disc brakes / 1976/79 F100/150 4WD & Bronco / 1976/79 F250 4WD / 1979 F350 4WD
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
C8AZ-2B264-A .. Brake Pressure Differential Valve Warning Lamp Switch / Available from Ford.
1968/79 F100/350, Bronco & Econoline / 1968/79 misc Passenger Cars.
Note: The valves and the switch used in 1967 are 1967 only.
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Senior User
Joined: Dec 2013
Posts: 348
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From: Bakersfield,CA
The PV with stubby front horizontal bleed pin is in a 1976 F250 . 2WD with front disc brakes. According to NumberDummy, the PV is P/N ,D5TZ-2B257-B.
<O
</OThe PV with the vertical pin with a spool on the end is in a 1973 F250, 2WD with front disc brakes. According to NumberDummy, the PV is P/N D3TZ-2B257-A.
<O</O
<O</O
The after market PVs incorporate the stubby horizontal bleed pin out the front with a rubber boot over it, not the vertical style pin with the **** on the end.
<O</O
<O</O
The pin is pushed inward to bleed the front brakes. Believe this is the reason of so many threads about problems bleeding the front caliper brakes.
<O</O
<O</O
To push the bleed pin inward was thinking about removing the rubber boot and use a small two jaw bearing puller with the threaded rod pushing against the bleed pin with the two jaws placed over the threaded nut grooves that hold the rubber boot.
<O</O
<O</O
The pin must be pushed inward to allow fluid flow through the front end of the proportioning valve. Under normal operation the spring loaded spool delays the fluid pressure to the front calipers and replaced the single Hold-Off valve used prior to 1971 with the combination front Hold-Off valve section and rear proportioning valve section to reduce pressure to the rear drum brakes to prevent drum lockup upon severve brake operaton.
<O</O
<O</O
The center located warning switch indicates if there is an out of balance of pressure between the front section and the rear section. It is not used as a primary brake light switch.<O</O
<O
</OThe PV with the vertical pin with a spool on the end is in a 1973 F250, 2WD with front disc brakes. According to NumberDummy, the PV is P/N D3TZ-2B257-A.<O
</O<O
</OThe after market PVs incorporate the stubby horizontal bleed pin out the front with a rubber boot over it, not the vertical style pin with the **** on the end.
<O
</O<O
</OThe pin is pushed inward to bleed the front brakes. Believe this is the reason of so many threads about problems bleeding the front caliper brakes.
<O
</O<O
</OTo push the bleed pin inward was thinking about removing the rubber boot and use a small two jaw bearing puller with the threaded rod pushing against the bleed pin with the two jaws placed over the threaded nut grooves that hold the rubber boot.
<O
</O<O
</OThe pin must be pushed inward to allow fluid flow through the front end of the proportioning valve. Under normal operation the spring loaded spool delays the fluid pressure to the front calipers and replaced the single Hold-Off valve used prior to 1971 with the combination front Hold-Off valve section and rear proportioning valve section to reduce pressure to the rear drum brakes to prevent drum lockup upon severve brake operaton.
<O
</O<O
</OThe center located warning switch indicates if there is an out of balance of pressure between the front section and the rear section. It is not used as a primary brake light switch.<O
</O
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Cargo Master
Joined: May 2010
Posts: 3,365
Likes: 12
From: NW Indiana
The problem with the aftermarket prop valves is leaking from the pin. Mine lasted about 100 miles before blowing the seal.
I would strongly suggest following HIO's advise if your looking to replace the old unit.
I would strongly suggest following HIO's advise if your looking to replace the old unit.
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,189
Likes: 5,792
From: S/W Missouri, Polk county
One of these threads should cover a complete rebuild of the pro valve....
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Thread Starter
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Senior User
Joined: Dec 2013
Posts: 348
Likes: 4
From: Bakersfield,CA
After doing additional research have the answer to the original question that iniatated the thread.
A simple L shaped sheet metal clip with a slot does the job of holding the metering hold-off valve pin inward while bleeding the brake lines.
One of the bolts that fasten the combination metering/proportioning valve to the bracket is loosened. The L bracket slot is placed under the bolt head while pushing the pin inward, then tighten up the bolt to the hold the L bracket in place. Now the pin is pushed inward with no hands, so the brake fluid will flow to the front brake calipers.
This procedure is required when bleeding the brakes on a 1975-1979 F150/F250.
A simple L shaped sheet metal clip with a slot does the job of holding the metering hold-off valve pin inward while bleeding the brake lines.
One of the bolts that fasten the combination metering/proportioning valve to the bracket is loosened. The L bracket slot is placed under the bolt head while pushing the pin inward, then tighten up the bolt to the hold the L bracket in place. Now the pin is pushed inward with no hands, so the brake fluid will flow to the front brake calipers.
This procedure is required when bleeding the brakes on a 1975-1979 F150/F250.
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