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You are here: Home Part Numbers Index GROUP 2B527 - Brake Pressure Differential Valve
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GROUP 2B527 - Brake Pressure Differential Valve

  

NOTE: Items listed here specifically pertain to '67-'72 Ford F100/350 trucks, but may have other applications (other Ford car/van/truck models) that are not included.

All part numbers and specifications are as reported in the 1964-1972 Ford Truck Master Parts Catalog 1975 Final Issue unless otherwise noted.
 Body Codes:
 Cab Parts
 › 81 - Conventional cab
 › 84 - Cowl
 › 85 - Cowl/Windshield		  Behind Cab Parts
 › 83 - Flareside box
 › 86 - Platform/Rack
 › 99 - Styleside box

When Ford started using a dual-pot brake master cylinder in 1967 to separate the front and rear brake circuits, they incorporated a brake pressure differential valve which was only used on drum/drum applications. As the years went by and Ford continued to fine-tune the device as front disc brakes were introduced, they incorporated a stand-alone metering valve to be used in conjunction with the pressure differential valve, and then finally introduced a proportioning valve. Ford combined the pressure differential valve, metering valve and proportioning valve into a single unit called the 'combination valve'.

Throughout the evolution of this item, Ford continued to call it a pressure differential valve and listed it in their parts catalogs as such under the same group number...even through the late-'70s.

For more information on what each of these devices does, visit:
Proportioning Valves 101.

Some PN listings below will take you to a picture page with appropriate applications listed. This page is a work-in-progress and new pictures/data will be added as they become available.

 

VEHICLES and RELATED
CATALOG CODES
Bronco  - U
Falcon (before 1/70)  - X
Falcon (from 1/70)  - B
Fairlane  - B
Ford  - A
Galaxie  - A
LTD  - A
Maverick  - P
Mustang  - F
Pinto  - L
Torino  - B
Thunderbird

 -

S
 

CATALOG CODES and
RELATED VEHICLES
A  - Ford/Galaxie/LTD
B  - Fairlane/Torino/Falcon*
F  - Mustang
L  - Pinto
P  - Maverick
S  - Thunderbird
U  - Bronco
X  - Falcon*

* = X before 1/70; B from 1/70

 
 

1965-1972 Ford Cars
2B257 VALVE - BRAKE PRESSURE DIFFERENTIAL - Also Refer to Group 2B091
- A -
67 A (drum brakes) C7AZ-2B257-D
A (disc brakes) C7AZ-2B257-C
68 A (drum brakes) C8AZ-2B257-B
A (disc brakes) - except New York Taxi
A (disc brakes) - New York Taxi - "Before 12/1/67"		   C8AZ-2B257-A
A (disc brakes) - New York Taxi - "From 12/1/67" C8AZ-2B257-C
69 A (drum brakes) C9AZ-2B257-B
A (manual disc Wakes) C9AZ-2B257-C
A (power disc brakes) C9AZ-2B257-A
70/71 A (drum brakes) D0AZ-2B257-B
A (disc brakes) D0AZ-2B257-C
72 A (drum brakes) D0AZ-2B257-B
A (disc brakes) 3-way control valve - iron D2AZ-2B257-A
A (disc brakes) 2-way control valve - brass D0AZ-2B257-C
- B -
67 B (drum brakes) C7OZ-2B257-C
B (disc brakes) C7OZ-2B257-D
68/69 B (drum brakes) C8OZ-2B257-A
B (disc brakes) C8OZ-2B257-B
70/71 B (drum brakes) D0OZ-2B257-B
B (disc brakes) D0AZ-2B257-C
72 B D2OZ-2B257-A
- F -
67 F (drum brakes) C7ZZ-2B257-C
F (Power Disc Brakes) C7ZZ-2B257-D
68/69 F (drum brakes) C8ZZ-2B257-B
F (disc brakes) C8ZZ-2B257-A
70/72 F (drum brakes) D0OZ-2B257-B
F (disc brakes) D0AZ-2B257-C
- L -
71 L (drum brakes) D0OZ-2B257-B
L (disc brakes) D1FZ-2B257-A
72 L (drum Brakes) D0OZ-2B257-B
L (exc. 73)-disc brakes "Before 1/17/72" D1FZ-2B257-A
L (exc. 73) - disc brakes "From 1/17/72" D2FZ-2B257-A
L (73) - disc brakes D0AZ-2B257-C
- P -
70 P "Before 7/14/69" D0DZ-2B257-A
P "From 7/14/69" D0DZ-2B257-C
71/72 P D0DZ-2B257-C
- S -
67 S C7SZ-2B257-B
68/69 S C8SZ-2B257-A
70/71 S D0AZ-2B257-C
72 S 3-way control valve - iron D2AZ-2B257-A
- U -
67 U C7TZ-2B257-B
68/72 U C8TZ-2B257-B

- X -
67 X (drum brakes) C7OZ-2B257-C
X (disc brakes) C7OZ-2B257-D
68/70 X (drum brakes) C8OZ-2B257-A
X (disc brakes) C8OZ-2B257-B
72 B Bolt (to bracket) - 5/16"-18 x 1 5/8" Hex. hd. 383420-S100
67/72 A, S Screw (to frame) - 5/16"-18 x 3/4" - washer head 381877-S2
SOURCE: 1965-1972 Ford Cars Master Parts Catalog 1975 Final Issue
 

Other numbers entered but not converted from an Engineering number to a Part Number yet:
 
   
Part numbers found online but not included in the MPC (meaning the number has been changed). Will update soon.  

VEHICLES and RELATED
CATALOG CODES
Bronco  - U
Fairmont  - P
Fiesta  - X
Ford  - A
Granada  - G
LTD II  - B
Maverick  - P
Mustang  - F
Pinto  - L
Thunderbird  - S
Torino  - B
 

CATALOG CODES and
RELATED VEHICLES
A  - Ford
B  - Torino
F  - Mustang
G  - Granada
L  - Pinto
P  - Maverick
P  - Fairmont
S  - Thunderbird
U  - Bronco
X  - Fiesta
 

1973-1979 Ford Cars
2B257 VALVE ASSY. (BRAKE PRESSURE DIFFERENTIAL)
73/75 A (exc. 71, P/C) D6OZ-2B257-A
73/75 A (71, P/C) D5AZ-2B257-A
76 A (exc. 71) - rear drum brake D6SZ-2B257-B (3/88)
76/78 A (71) - rear drum brake D6AZ-2B257-F
76 A (exc. 71 & P/C) - rear disc brake D6AZ-2B257-E (9/83)
76/78 A (71) - rear disc brake D6AZ-2B257-G
76/78 A (P/C) - rear disc brake D6AZ-2B257-H (3/81)
77/78 A (exc. 71) - drum brake D7AZ-2B257-A
77/78 A (exc. 71) - rear disc brake D6DZ-2B257-B
79 A (53, 65, exc. P/C-T/T) D9AZ-2B257-C # D9AC-2B382-DA
79 A (71, exc. P/C-T/T) D9AZ-2B257-D # D9AC-2B382-EA
79 A (P/C, T/T) D9AZ-2B257-E # D9AC-2B382-CA
73/75 B D5AZ-2B257-A # D5AA-2B382-AA
76 B (exc. 71) "Before 1/1/76" D6OZ-2B257-A
76 B (exc. 71) "From 1/1/76"
B (71)		 D6OZ-2B257-A
D6AZ-2B257-F		  
77 B (exc. 71)
B (71)		 D7OZ-2B257-A
D6AZ-2B257-F
78/79 B D6OZ-2B257-A
73 F - drum brakes D5DZ-2B257-A
73/74 F - disc brakes D9BZ-2B257-B
75 F D5ZZ-2B257-A
76/78 F D9FZ-2B257-A
79 F D9ZZ-2B257-A
79 F - 2.3L turbo & 5.0L D9ZZ-2B257-B (10/86) For service fix
75 G - rear drum brake D5ZZ-2B257-A
76 G - rear drum brake D6DZ-2B257-C
75/76 G - rear disc brake D6DZ-2B257-B
77/79 G D9DZ-2B257-A
73 L - drum brakes D5DZ-2B257-A
73 L (62,64) - disc brakes D2FZ-2B257-A (12/81)
73 L (73) - disc brakes D9BZ-2B257-B
74 L (62,64) D9BZ-2B257-B
74 L (73) D4FZ-2B257-A (2/80)
75 L (62,64) D5ZZ-2B257-A
75 L (73) D4DZ-2B257-A
76/78 L (62,64) D9FZ-2B257-A
L (73) D9BZ-2B257-B
79 L (62,64) D9FZ-2B257-A
L (73) D9BZ-2B257-B
73 P D0DZ-2B257-C
74 P - drum brakes - "Before 12/3/73" D5DZ-2B257-A (9/83)
74 P - drum brakes - "From 12/3/73" D9BZ-2B257-B
74 P - disc brakes D4DZ-2B257-A
75 P - drum brakes D5DZ-2 B257-A (9/83) # D5DA-2B257-AA
75 P - disc brakes D4DZ-2B257-A
76/77 P D9BZ-2B257-B
78 P (exc.71) D9BZ-2B257-B
78/79 P (71) D9BZ-2B257-A
79 P (exc. 71) D9BZ-2B257-B
73 S D2AZ-2B257-A 3-way control valve - iron
74 S D5AZ-2B257-A
75 S - rear drum brakes "Before 10/1/74" D2AZ-2B257-A
75 S - rear drum brakes "From 10/1/74" D6OZ-2B257-A
75/76 S - rear disc brakes "Before 1/1/76" D5LZ-2B257-A
r/b D6SZ-2B257-C (12/81)		 # D5LA-2B328-AA, AB
76 S - rear drum brake D6SZ-2B257-B (3/88)
76 S - rear disc brake "From 1/1/76" D6SZ-2B257-C
77 S D7OZ-2B257-A
78/79 S D6OZ-2B257-A
73/74 U C8AZ-2B257-B
75 U D5TZ-2B257-A (10/83)
76/79 U D5TZ-2B257-B
73/79 A, S 381877-S2 (UU-52-AF) - screw (to frame) - washer head - 5/16"-18 x 3/4"
73/79 B 383420-S100 Bolt (to bracket) - hex. head - 5/16"-18 x 1 5/8"
2B260 BRACKET (BRAKE PRESSURE DIFFERENTIAL VALVE)
73/79 A D2AZ-2B260-A
73/75 B D2OZ-2B260-A
76/79 B D6OZ-2B260-A
75/76 G - w/four wheel disc brakes D5DZ-2B260-A (3/81)
G - w/o four wheel disc brakes 2B260 Serviced only in 2B257 assy.
73/76 S D2OZ-2B260-A
77/79 S D6OZ-2B260-A  
Symbol indicates part is not supplied for service due to the following:
  a. Part is superseded and replaced as indicated in the description column of text
b. Part can be improvised as indicated in the description column of text
c. Due to it's function there would be little or no demand
# Identification
SOURCE: 1973-1979 Ford Cars Master Parts Catalog 1988 Final Issue

 

1967-1972 Ford Trucks
2B257 VALVE - BRAKE PRESSURE DIFFERENTIAL
B SERIES
68 B500/700 Dash mounted booster - with split hyd. vacuum brakes C8TZ-2B257-E
68 B600/750 Frame mounted booster - with split hyd. vacuum brakes C8TZ-2B257-F
69/72 B500/700 With split hyd. vacuum brakes & dash mounted booster C9TZ-2B257-A
69/72 B600/700 With split hyd. vacuum brakes & frame mounted booster C9TZ-2B257-B
C SERIES
68 C550/950 With split hyd. vacuum brakes C8HZ-2B257-A
69/72 C500/950 With split hydraulic vacuum brakes C9HZ-2B257-A
E SERIES
67 E100 C7TZ-2B257-C
69/72 P100/300 C8UZ-2B257-A
F SERIES
67 F100 (4 x 4) C7TZ-2B257-B
68/72 F100 (4 X 4) C8AZ-2B257-B
67 F100/250 (4 x 2), F350 C7TZ-2B257-E
68/72 F100/250 (4 x 2), F350 With split hydraulic brakes C8TZ-2B257-D
67 F250 (4 x 4) C7TZ-2B257-D
68/72 F250 (4 x 4) C8TZ-2B257-C
68/72 F250/350 With disc brakes C8TZ-2B257-G
69/72 F500/600 With split hydraulic vacuum brakes & dash mounted booster C9TZ-2B257-A
69/72 F500/950 " With split hydraulic vacuum brakes & frame mounted booster C9TZ-2B257-B
L-LN-LNT-LT-LTS SERIES
70/72 L800/900, LN600/800,
LNT800, LT-LTS800/900		 With split hydraulic vacuum brakes - identified
D0HA-2B257-A or D2HA-2B257-AA		 D0HZ-2B257-A
N SERIES
68 N850/950 With split hyd. vacuum brakes C8HZ-2B257-A
69 N500/600 With split hyd. vacuum brakes & dash mounted booster C9TZ-2B257-A
69 N600/700 With split hyd. vacuum brakes & frame mounted booster C9TZ-2B257-B
P SERIES
67 P100 C7TZ-2B257-A
68/72 P350/400 C8TZ-2B257-A
SOURCE: 1964-1972 Ford Master Trucks Parts Catalog 1975 Final Issue
 
Other numbers entered with an Engineering number but not converted to a valid Part Number yet:
 
 

 

1973-1979 Ford Trucks
2B257 VALVE (BRAKE PRESSURE DIFFERENTIAL) - Also refer to group 15A851
73/76 B500 - w/split H/V brakes and
dash mounted booster		 C9TZ-2B257-A
77 B500 D7TZ-2B257-A # D7TA-2B257-AA
73/74 E100/300 C8UZ-2B257-A
75/79 E100/150 D5TZ-2B257-B # D5TA-2B524-FA, FB
75/79 E250/350 D4TZ-2B257-A # D4TA-2B328-A1A-A2A,
D5TA-2B328-C1A, C2A
79 E350 School Bus D9TZ-2B257-A # D9TA-2B524-AA
73/75 F100 - 4/W/D C8TZ-2B257-B
73/74 F100 - 2/W/D w/disc brakes
F250 - 2/W/D w/disc brakes and 6200 G.V.W.		 D3TZ-2B257-A # D3TA-2B254-AA
75/79 F100/150 - - 2/W/D, 4/W/D w/disc brakes
F250 - 2/W/D w/disc brakes and 6200 GVW		 D5TZ-2B257-B # D5TA-2B524-FA, FB
73 F250 - 2/W/D w/disc brakes and 6900, 7500 and 8100 G.V.W.
F350 w/disc brakes		 C8TZ-2B257-G
74/79 F250 2/W/D w/disc brakes and 6900, 7500 and 8100 GVW
F350 - w/disc brakes		 D4TZ-2B257-A # D4TA-2B328-A1A-A2A,
D5TA-2B328-C1A,C2A
73/75 F250 - 4/W/D C8TZ-2B257-C
76/ F250 4/W/D w/disc brakes D5TZ-2B257-B # D5TA-2B524-FA, FB
73/77 F500 - w/split H/V brakes and dash mounted booster C9TZ-2B257-A
73/77 F500 - w/split H/V brakes and frame mounted booster C9TZ-2B257-B
73/76 M450/500 C9HZ-2B257-A
73/76 P350/400 C8TZ-2B257-A

Other numbers entered but not associated with an application yet:
 
   
   

 

Symbol indicates part is not supplied for service due to the following:
  a. Part is superseded and replaced as indicated in the description column of text
b. Part can be improvised as indicated in the description column of text
c. Due to it's function there would be little or no demand
# Identification
SOURCE: 1973-1979 Ford Master Trucks Parts Catalog Oct. 1979 New Issue
 

 
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