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ACDelco 18M71 Brake Master Cylinder

ACDelco 18M71 Brake Master Cylinder Image 1
ACDelco 18M71 Brake Master Cylinder Image 2
ACDelco 18M71 Brake Master Cylinder Image 3
ACDelco 18M71 Brake Master Cylinder Image 4
ACDelco 18M71 Brake Master Cylinder Image 5
ACDelco 18M71 Brake Master Cylinder Image 6
ACDelco 18M71 Brake Master Cylinder Image 7
ACDelco 18M71 Brake Master Cylinder Image 8
ACDelco 18M71 Brake Master Cylinder

ACDelco
Brand:ACDelco
Part Number: 18M71
UPC: 00707773421185
Weight: 11.17 lbs
Condition:New



On Sale:

$75.04

Availability:
16 in Stock
Warehouse: US-4
Quantity:

Product Information

Description:

CYLINDER ASMBRK MAS

ACDelco Professional Brake Master Cylinders use both aluminum and iron castings, making them a high quality replacement for many vehicles on the road today. These master cylinders contain both Ethylene Propylene (EPDM) and Styrene Butadiene (SBR) rubber components to provide superior resistance to heat, corrosion, and leakage. ACDelco Professional Brake Master Cylinders are ready to bench bleed and install right out of the box - no assembly required. These premium aftermarket replacement brake master cylinders are manufactured to meet your expectations for fit, form, and function. ⚠ WARNING: Cancer and Reproductive Harm - https://www.P65Warnings.ca.gov

Features and Benefits:

  • Cast iron and aluminum specifications; no extra stress on the brake boosting mounting
  • Geometrical tolerance ensures that the body and plastic reservoir match for a proper fit
  • Meets the brake performance requirements of SAE J1153 and J1154 testing, providing reliability and quality
  • Piston assembly and return spring help to prevent brake drag, which can cause premature brake pad wear
  • Pressure tested to ensure safe and confident braking

Specifications:

Bleeder Hoses Included:
Yes
Bore Size:
1.313 in.
Brake Booster Included:
No
Height (in):
4.8 in
Length (in):
9.4 in
Master Cylinder Bore Diameter:
1.3125 in.
Master Cylinder Bore Diameter:
33.3375 mm
Master Cylinder Cap Included:
Yes
Master Cylinder Material:
Iron
Measurements:
1 5/16 in Cylinder Bore
Mounting Bracket Included:
No
Mounting Hole Diameter:
0.433 in.
Mounting Hole Quantity:
2
Port Quantity:
2
Primary Outlet Thread Diameter:
0.5625 in.
Primary Outlet Thread Diameter:
14.287 mm
Programming Required:
No
Push Rod Included:
No
Reservoir Included:
Yes
Secondary Outlet Thread Diameter:
0.5 in.
Secondary Outlet Thread Diameter:
12.7 mm
Weight (lb):
11.17 lb
Width (in):
5.8 in

Features and Benefits:

  • – Calipers and wheel cylinders should be checked every brake inspection and serviced or replaced as required.
  • – Check brake fluid level at every oil change. Replace fluid according to owner's manual recommendations.
  • – Check the thickness of your brake pads.
  • – Inspect the brake lines for rust, punctures, or visible leaks (You may be able to do this, but consult a qualified technician if necessary).
  • – Inspection of brake lining and pads for wear or contamination by brake fluid or grease.
  • – Inspection of the brake hoses for brittleness or cracking.
  • – Inspection of wheel bearings and grease seals.
  • – Parking brake adjustments (as needed).
  • The following inspections and maintenance procedures can help prevent potential brake problems:
  • The following should be conducted by a qualified technician:

Specifications:

Country of Origin:
CN

Select a vehicle to narrow ACDelco 18M71 Brake Master Cylinder fitment info!

Last Updated: 03/09/2024

Years Vehicle Per Vehicle Fit NotesFitment Notes
Chevrolet C30

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
w/ Stamping # 1605 on Master Cylinder
 

Chevrolet C30



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes
w/ Stamping # 1605 on Master Cylinder

1 Per Vehicle
Chevrolet C30

6.2L V8 Diesel OHV
1
 
Professional
 

Chevrolet C30



6.2L V8 Diesel OHV Professional

1 Per Vehicle
Chevrolet C30

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV
1
 
Professional
 

Chevrolet C30



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV Professional

1 Per Vehicle
Chevrolet C30

4.1L L6 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

Chevrolet C30



4.1L L6 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
Chevrolet C30

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

Chevrolet C30



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
Chevrolet C30

4.1L L6 Gas OHV,
5.0L V8 Gas OHV,
5.7L V8 Diesel OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

Chevrolet C30



4.1L L6 Gas OHV,
5.0L V8 Gas OHV,
5.7L V8 Diesel OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
Chevrolet C30

6.6L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

Chevrolet C30



6.6L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
Chevrolet C30

4.1L L6 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

Chevrolet C30



4.1L L6 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
Chevrolet C30 Pickup

4.1L L6 Gas OHV,
4.1L L6 LPG OHV,
4.8L L6 Gas OHV,
4.8L L6 LPG OHV,
5.7L V8 Gas OHV,
5.7L V8 LPG OHV,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

Chevrolet C30 Pickup



4.1L L6 Gas OHV,
4.1L L6 LPG OHV,
4.8L L6 Gas OHV,
4.8L L6 LPG OHV,
5.7L V8 Gas OHV,
5.7L V8 LPG OHV,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
Chevrolet G30

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.6L V8 Gas OHV,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

Chevrolet G30



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.6L V8 Gas OHV,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
Chevrolet G30 Van

4.1L L6 Gas OHV,
4.8L L6 Gas,
4.8L L6 Gas OHV,
4.8L L6 LPG OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

Chevrolet G30 Van



4.1L L6 Gas OHV,
4.8L L6 Gas,
4.8L L6 Gas OHV,
4.8L L6 LPG OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
Chevrolet K30

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV
1
 
Professional
w/ Stamping # 1605 on Master Cylinder
w/ 13 X 3 1/2 Brake Drum
 

Chevrolet K30



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV Professional
w/ Stamping # 1605 on Master Cylinder
w/ 13 X 3 1/2 Brake Drum

1 Per Vehicle
Chevrolet K30

6.2L V8 Diesel OHV
1
 
Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in
 

Chevrolet K30



6.2L V8 Diesel OHV Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in

1 Per Vehicle
Chevrolet K30

7.4L V8 Gas OHV
1
 
Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in
 

Chevrolet K30



7.4L V8 Gas OHV Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in

1 Per Vehicle
Chevrolet K30

4.8L L6 Gas OHV,
5.7L V8 Gas OHV
1
 
Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in
 

Chevrolet K30



4.8L L6 Gas OHV,
5.7L V8 Gas OHV Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in

1 Per Vehicle
Chevrolet K30

6.6L V8 Gas OHV
1
 
Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in
 

Chevrolet K30



6.6L V8 Gas OHV Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in

1 Per Vehicle
Chevrolet K30

7.4L V8 Gas OHV
1
 
Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in
 

Chevrolet K30



7.4L V8 Gas OHV Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in

1 Per Vehicle
Chevrolet K30 Pickup

4.1L L6 Gas OHV,
4.1L L6 LPG OHV,
4.8L L6 Gas OHV,
4.8L L6 LPG OHV,
5.7L V8 Gas OHV,
5.7L V8 LPG OHV,
7.4L V8 Gas OHV
1
 
Professional
GM Brake Code JB8
 

Chevrolet K30 Pickup



4.1L L6 Gas OHV,
4.1L L6 LPG OHV,
4.8L L6 Gas OHV,
4.8L L6 LPG OHV,
5.7L V8 Gas OHV,
5.7L V8 LPG OHV,
7.4L V8 Gas OHV Professional
GM Brake Code JB8

1 Per Vehicle
Chevrolet P30

6.2L V8 Diesel OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
w/ Bendix Master Cylinder
Rear Drum
 

Chevrolet P30



6.2L V8 Diesel OHV Professional
with 13 IN x 3-1/2 IN Brakes
w/ Bendix Master Cylinder
Rear Drum

1 Per Vehicle
Chevrolet P30

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
w/ Bendix Master Cylinder
Rear Drum
 

Chevrolet P30



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes
w/ Bendix Master Cylinder
Rear Drum

1 Per Vehicle
Chevrolet P30

4.1L L6 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
w/ Bendix Master Cylinder
Rear Drum
 

Chevrolet P30



4.1L L6 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes
w/ Bendix Master Cylinder
Rear Drum

1 Per Vehicle
Chevrolet P30

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV
1
 
Professional
Reservoir Cap Is Rectangular
Bore 1-15/16in
Front Disc
Rear Drum
 

Chevrolet P30



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV Professional
Reservoir Cap Is Rectangular
Bore 1-15/16in
Front Disc
Rear Drum

1 Per Vehicle
GMC C35

4.1L L6 Gas OHV,
5.0L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

GMC C35



4.1L L6 Gas OHV,
5.0L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
GMC C35

6.6L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

GMC C35



6.6L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
GMC C35

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

GMC C35



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
GMC C35

4.1L L6 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

GMC C35



4.1L L6 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
GMC C35/C3500 Pickup

4.1L L6 Gas OHV,
4.1L L6 LPG OHV,
4.8L L6 Gas OHV,
4.8L L6 LPG OHV,
5.7L V8 Gas OHV,
5.7L V8 LPG OHV,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

GMC C35/C3500 Pickup



4.1L L6 Gas OHV,
4.1L L6 LPG OHV,
4.8L L6 Gas OHV,
4.8L L6 LPG OHV,
5.7L V8 Gas OHV,
5.7L V8 LPG OHV,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
GMC C3500

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
w/ Stamping # 1605 on Master Cylinder
 

GMC C3500



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes
w/ Stamping # 1605 on Master Cylinder

1 Per Vehicle
GMC C3500

6.2L V8 Diesel OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

GMC C3500



6.2L V8 Diesel OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
GMC C3500

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

GMC C3500



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
GMC C3500

4.1L L6 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

GMC C3500



4.1L L6 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
GMC C3500

6.6L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

GMC C3500



6.6L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
GMC G35

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.6L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

GMC G35



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.6L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
GMC G35/G3500 Van

4.1L L6 Gas OHV,
4.1L L6 LPG OHV,
4.8L L6 Gas OHV,
4.8L L6 LPG OHV,
5.7L V8 Gas OHV,
5.7L V8 LPG OHV,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
 

GMC G35/G3500 Van



4.1L L6 Gas OHV,
4.1L L6 LPG OHV,
4.8L L6 Gas OHV,
4.8L L6 LPG OHV,
5.7L V8 Gas OHV,
5.7L V8 LPG OHV,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes

1 Per Vehicle
GMC K35

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.6L V8 Gas OHV
1
 
Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in
 

GMC K35



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.6L V8 Gas OHV Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in

1 Per Vehicle
GMC K3500

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
w/ Stamping # 1605 on Master Cylinder
 

GMC K3500



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes
w/ Stamping # 1605 on Master Cylinder

1 Per Vehicle
GMC K3500

6.2L V8 Diesel OHV
1
 
Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in
 

GMC K3500



6.2L V8 Diesel OHV Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in

1 Per Vehicle
GMC K3500

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV
1
 
Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in
 

GMC K3500



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in

1 Per Vehicle
GMC K3500

6.6L V8 Gas OHV
1
 
Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in
 

GMC K3500



6.6L V8 Gas OHV Professional
w/ 13 X 3 1/2 Brake Drum
Reservoir Cap Is Rectangular
Bore 1-15/16in

1 Per Vehicle
GMC P3500

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV
1
 
Professional
w/ Bendix Master Cylinder
w/ 13 x 3 1/2 Rear Shoes, w/ JB8, JD8 Brake Code
Rear Drum
 

GMC P3500



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
6.2L V8 Diesel OHV,
7.4L V8 Gas OHV Professional
w/ Bendix Master Cylinder
w/ 13 x 3 1/2 Rear Shoes, w/ JB8, JD8 Brake Code
Rear Drum

1 Per Vehicle
GMC P3500

6.2L V8 Diesel OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
w/ Bendix Master Cylinder
Rear Drum
 

GMC P3500



6.2L V8 Diesel OHV Professional
with 13 IN x 3-1/2 IN Brakes
w/ Bendix Master Cylinder
Rear Drum

1 Per Vehicle
GMC P3500

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV
1
 
Professional
with 13 IN x 3-1/2 IN Brakes
w/ Bendix Master Cylinder
Rear Drum
 

GMC P3500



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV Professional
with 13 IN x 3-1/2 IN Brakes
w/ Bendix Master Cylinder
Rear Drum

1 Per Vehicle
GMC P3500

4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV
1
 
Professional
w/ Bendix Master Cylinder
w/ 13 x 3 1/2 Rear Shoes, w/ JB8, JD8 Brake Code
Rear Drum
 

GMC P3500



4.8L L6 Gas OHV,
5.7L V8 Gas OHV,
7.4L V8 Gas OHV Professional
w/ Bendix Master Cylinder
w/ 13 x 3 1/2 Rear Shoes, w/ JB8, JD8 Brake Code
Rear Drum

1 Per Vehicle