Wheel Cylinder: Reassembly

If bore of cylinder is lightly pitted or scratched, hone or replace as necessary. Soak rubber cylinder cups in suitable brake fluid or assembly lubricant and reverse disassembly procedure.

NOTE: It is not necessary to clamp cylinder ends, as lips of wheel cylinder boots will retain pistons.

TIGHTENING SPECIFICATIONS

Application	Ft. Lbs.
Brake Hose Attaching Nut	18
Parking Brake Cable Nut	20
Equalizer Nut	18
Rear Brake Anchor Pin	140
Application	Inch Lbs.
Brake Line Nut	150
Support Plate Attaching Bolts	140
Wheel Cylinder Attaching Bolts	50
Brake Line Clips	150

1965 BRAKE SYSTEM SPECIFICATIONS

Application

Drum Diam.

Wheel Cylinder Diameter

Master Cylinder

Front

Rear

Diameter

Chevrolet

C, K10

11"

1 1/8"

G10

9 1/2"

1 1/16"

7/8"

P10

11"

1 1/8"

13/16"

C20

11 1/8"

1 1/8"

K20

12"

1 1/8"

P20

11 1/8"

1 3/16"

C30

⁽¹⁾1 1/8"

1 1/8"

1 1/4"

⁽²⁾ 1 1/8"

P30

⁽¹⁾ 12"

1 1/8"

1 1/4"

GMC

C, K1000

11"

1 1/8"

P1000

11"

1 1/8"

13/16"

C1500

11 1/8"

1 1/8"

K1500

12"

1 1/8"

P1500

11 1/8"

1 3/16"

C2500

⁽¹⁾1 1/8"

1 1/8"

1 1/4"

1 1/8"

P2500

⁽¹⁾ 12"

1 1/8"

1 1/4"

⁽¹⁾	Rear brake drum diameter is 13".

⁽²⁾	If equipped with power brakes, bore diameter is 1".

1966 BRAKE SYSTEM SPECIFICATIONS

Application

Drum Diam.

Wheel Cylinder Diameter

Master Cylinder

Front

Rear

Diameter

Chevrolet

C, K10

11"

1 1/8"

G10

9 1/2"

1 1/8"

P10

11"

1 1/8"

13/16"

C20

11 1/8"

1 1/8"

K20

12"

1 1/8"

P20

11 1/8"

1 13/16"

C30

⁽¹⁾ 11 1/8"

1 1/8"

1 1/4"

⁽²⁾ 1 1/8"

P30

⁽¹⁾ 12"

1 1/8"

1 1/4"

GMC

C, K1000

11"

1 1/8"

P1000

11"

1 1/8"

13/16"

C1500

11 1/8"

1 1/8"

K1500

12"

1 1/8"

P1500

11 1/8"

1 3/16"

C2500

⁽¹⁾ 11 1/8"

1 1/8"

1 1/4"

1 1/8"

P2500

⁽¹⁾ 12"

1 1/8"

1 1/4"

⁽¹⁾	Rear brake drum diameter is 13".

⁽²⁾	If equipped with power brakes, bore diameter is 1".

1967 BRAKE SYSTEM SPECIFICATIONS

Application

Drum Diam.

Wheel Cylinder Diameter

Master Cylinder

Front

Rear

Diameter

Chevrolet

C, K10

11"

1 1/8"

G10

9 1/2"

1 1/8"

P10

11"

1 1/8"

13/16"

C20

11 1/8"

1 1/8"

G20

11"

1 1/8"

K20

12"

1 1/8"

P20

11 1/8"

1 3/16"

C30

⁽¹⁾ 11 1/8"

1 1/8"

1 1/4"

1 1/8"

P30

⁽¹⁾ 12"

1 1/8"

1 1/4"

GMC

C, K1500

11"

1 1/8"

G1500

9 1/2"

1 1/8"

P1500

11"

1 1/8"

13/16"

C2500

11 1/8"

1 1/8"

G2500

11"

1 1/8"

K2500

12"

1 1/8"

P2500

11 1/8"

1 3/16"

C3500

⁽¹⁾ 11 1/8"

1 1/8"

1 1/4"

1 1/8"

P3500

⁽¹⁾ 12"

1 1/8"

1 1/4"

⁽¹⁾	Rear brake drum diameter is 13"

1968 BRAKE SYSTEM SPECIFICATIONS

Application

Drum Diam.

Wheel Cylinder Diameter

Master Cylinder

Front

Rear

Diameter

Chevrolet

C, K10

11"

1 1/8"

G10

9 1/2"

1 1/8"

P10

11"

1 1/8"

13/16"

C20

11 1/8"

1 1/8"

G20

11"

1 1/8"

K20

12"

1 1/8"

P20

11 1/8"

1 3/16"

C30

⁽¹⁾ 11 1/8"

1 1/8"

1 1/4"

1 1/8"

P30

⁽¹⁾ 12"

1 1/8"

1 1/4"

GMC

C, K1500

11"

1 1/8"

G1500

9 1/2"

1 1/8"

P1500

11"

1 1/8"

13/16"

C2500

11 1/8"

1 1/8"

G2500

11"

1 1/8"

K2500

12"

1 1/8"

P2500

11 1/8"

1 3/16"

C3500

⁽¹⁾ 11 1/8"

1 1/8"

1 1/4"

1 1/8"

P3500

⁽¹⁾ 12"

1 1/8"

1 1/4"

⁽¹⁾	Rear brake drum diameter is 13".

1969 BRAKE SYSTEM SPECIFICATIONS

Application

Drum Diam.

Wheel Cylinder Diameter

Master Cylinder

Front

Rear

Diameter

Chevrolet

C, K10

11"

1 1/8"

G10

9 1/2"

1 1/8"

P10

11"

1 1/8"

13/16"

C20

11 1/8"

1 1/8"

G20

11"

1 1/8"

K20

12"

1 1/8"

P20

11 1/8"

1 13/16"

C30

⁽¹⁾ 11 1/8"

1 1/8"

1 1/4"

1 1/8"

P30

⁽¹⁾ 12"

1 1/8"

1 1/4"

GMC

C, K1500

11"

1 1/8"

G1500

9 1/2"

1 1/8"

P1500

11"

1 1/8"

13/16"

C2500

11 1/8"

1 1/8"

G2500

11"

1 1/8"

K2500

12"

1 1/8"

P2500

11 1/8"

1 3/16"

C3500

⁽¹⁾ 11 1/8"

1 1/8"

1 1/4"

1 1/8"

P3500

⁽¹⁾ 12"

1 1/8"

1 1/4"

⁽¹⁾	Rear brake drum diameter is 13".

1970 BRAKE SYSTEM SPECIFICATIONS

Application

Drum Diam.

Wheel Cylinder Diameter

Master Cylinder

Front

Rear

Diameter

Chevrolet

C, K10

11"

1 1/8"

G10

9 1/2"

1 1/8"

P10

11"

1 1/8"

13/16"

C20

11 1/8"

1 1/8"

G20

11"

1 1/8"

K20

12"

1 1/8"

P20

11 1/8"

1 3/16"

C30

⁽¹⁾ 11 1/8"

1 1/8"

1 1/4"

1 1/8"

G30

⁽¹⁾ 11 1/8"

1 1/8"

P30

⁽¹⁾ 12"

1 1/8"

1 1/4"

GMC

C, K1500

11"

1 1/8"

G1500

9 1/2"

1 1/8"

P1500

11"

1 1/8"

13/16"

C2500

11 1/8"

1 1/8"

G2500

11"

1 1/8"

K2500

12"

1 1/8"

P2500

11 1/8"

1 3/16"

C3500

⁽¹⁾ 11 1/8"

1 1/8"

1 1/4"

1 1/8"

G3500

⁽¹⁾ 11 1/8"

1 1/8"

P3500

⁽¹⁾ 12"

1 1/8"

1 1/4"

⁽¹⁾	Rear brake drum diameter is 13"

1971 BRAKE SYSTEM SPECIFICATIONS

Application

Drum Diam.

Wheel Cylinder Diameter

Master Cylinder

Front

Rear

Diameter

Chevrolet

C, K, P10

11"

⁽¹⁾

1 1/8"

G10

9 1/2"

⁽¹⁾

⁽²⁾ 7/8"

1 1/8"

C20

11 1/8"

⁽¹⁾

1 1/8"

K20

12"

⁽¹⁾

1 1/8"

P20

11 1/8"

⁽¹⁾

1 1/8"

G20

11"

⁽¹⁾

1 1/8"

C30

13"

⁽¹⁾

1 1/8"

G30

13"

⁽¹⁾

1 1/8"

P30

⁽³⁾ 12"

1 1/8"

GMC

C, K, P1500

11"

⁽¹⁾

1 1/8"

G1500

9 1/2"

⁽¹⁾

⁽²⁾ 7/8"

1 1/8"

C2500

11 1/8"

⁽¹⁾

1 1/8"

G2500

11"

⁽¹⁾

1 1/8"

K2500

12"

⁽¹⁾

1 1/8"

P2500

11 1/8"

⁽¹⁾

1 1/8"

C3500

13"

⁽¹⁾

1 1/8"

G3500

13"

⁽¹⁾

1 1/8"

P3500

⁽³⁾ 12"

1 1/8"

⁽¹⁾	Front disc brakes are standard equipment.

⁽²⁾	Diameter is 1" on vehicle equipped with 3000 lb. axle.

⁽³⁾	Rear brake drum diameter is 13".

1972 BRAKE SYSTEM SPECIFICATIONS

Application

Drum Diam.

Wheel Cylinder Diameter

Master Cylinder

Front

Rear

Diameter

Chevrolet

C, K, P10

11"

⁽¹⁾

1 1/8"

G10

9 1/2"

⁽¹⁾

⁽²⁾ 7/8"

1 1/8"

C20

11 1/8"

⁽¹⁾

1 1/8"

K20

12"

⁽¹⁾

1 1/8"

P20

11 1/8"

⁽¹⁾

1 1/8"

G20

11"

⁽¹⁾

1 1/8"

C30

13"

⁽¹⁾

1 1/8"

G30

13"

⁽¹⁾

1 1/8"

P30

13"

⁽¹⁾

1 1/8"

GMC

C, K, P1500

11"

⁽¹⁾

1 1/8"

G1500

9 1/2"

⁽¹⁾

⁽²⁾ 7/8"

1 1/8"

C2500

11 1/8"

⁽¹⁾

1 1/8"

G2500

11"

⁽¹⁾

1 1/8"

K2500

12"

⁽¹⁾

1 1/8"

P2500

11 1/8"

⁽¹⁾

1 1/8"

C3500

13"

⁽¹⁾

1 1/8"

G3500

13"

⁽¹⁾

1 1/8"

P3500

13"

⁽¹⁾

1 1/8"

⁽¹⁾	Front disc brakes are standard equipment.

⁽²⁾	Diameter is 1" on vehicle equipped with 3000 lb. axle.

1973 BRAKE SYSTEM SPECIFICATIONS

Application

Drum Diam.

Wheel Cylinder Diameter

Master Cylinder

Front

Rear

Diameter

Chevrolet

C, K, P10

11"

⁽¹⁾

1 1/8"

G10

9 1/2"

⁽¹⁾

1 1/8"

C20

11 1/8"

⁽¹⁾

1 1/8"

G20

11"

⁽¹⁾

1 1/8"

K20

12"

⁽¹⁾

1 1/8"

P20

11 1/8"

⁽¹⁾

1 1/8"

C, P30⁽²⁾

13"

⁽¹⁾

1 1/8"

G30

13"

⁽¹⁾

1 1/8"

GMC

C, K, P1500

11"

⁽¹⁾

1 1/8"

G1500

9 1/2"

⁽¹⁾

1 1/8"

C2500

11 1/8"

⁽¹⁾

1 1/8"

G2500

11"

⁽¹⁾

1 1/8"

K2500

12"

⁽¹⁾

1 1/8"

P2500

11 1/8"

⁽¹⁾

1 1/8"

C, P3500 ⁽²⁾

13"

⁽¹⁾

1 1/8"

G3500

13"

⁽¹⁾

1 1/8"

⁽¹⁾	Front disc brakes are standard equipment.

⁽²⁾	Except vehicles with 11, 000 lb. rear axle. Vehicles with 11, 000 lb. rear axle use front disc brakes and dual cylinder rear brakes.

1974 BRAKE SYSTEM SPECIFICATIONS

Application

Drum Diam.

Wheel Cylinder Diameter

Master Cylinder

Front

Rear

Diameter

Chevrolet

C, K, P10

11"

⁽¹⁾

1 1/8"

G10

9 1/2"

⁽¹⁾

1 1/8"

C20

11 1/8"

⁽¹⁾

1 1/8"

G20

11"

⁽¹⁾

1 1/8"

K20

12"

⁽¹⁾

1 1/8"

P20

11 1/8"

⁽¹⁾

1 1/8"

C, P30 ⁽²⁾

13"

⁽¹⁾

1 1/8"

G30

13"

⁽¹⁾

1 1/8"

GMC

C, K, P1500

11"

⁽¹⁾

1 1/8"

G1500

9 1/2"

⁽¹⁾

1 1/8"

C2500

11 1/8"

⁽¹⁾

1 1/8"

G2500

11"

⁽¹⁾

1 1/8"

K2500

12"

⁽¹⁾

1 1/8"

P2500

11 1/8"

⁽¹⁾

1 1/8"

C, P3500 ⁽²⁾

13"

⁽¹⁾

1 1/8"

G3500

13"

⁽¹⁾

1 1/8"

⁽¹⁾	Front disc brakes are standard equipment.

⁽²⁾	Except vehicles with 11, 000 lb. rear axle. Vehicles with 11, 000 lb. rear axle use front disc brakes and dual cylinder rear brakes.