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ACDelco 18M320 Brake Master Cylinder

ACDelco 18M320 Brake Master Cylinder Image 3

ACDelco 18M320 Brake Master Cylinder Image 4

ACDelco 18M320 Brake Master Cylinder Image 5

ACDelco 18M320 Brake Master Cylinder Image 6

ACDelco 18M320 Brake Master Cylinder Image 7

ACDelco 18M320 Brake Master Cylinder Image 8


Brand:	ACDelco
Part Number:	18M320
UPC:	00707773421284
Weight:	3.17 lbs
Condition:	New

On Sale:

$73.41

Availability:

2 in Stock

Warehouse:

US-4

Quantity:

Product Information

Description:

MASTER CYL (SLP)

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:

0.875 in.

Brake Booster Included:

Height (in):

5.6 in

Length (in):

11.3 in

Master Cylinder Bore Diameter:

0.875 in.

Master Cylinder Bore Diameter:

22.225 mm

Master Cylinder Cap Included:

Yes

Master Cylinder Material:

Aluminum

Measurements:

7/8 in Cylinder Bore

Mounting Bracket Included:

Mounting Hole Diameter:

0.433 in.

Mounting Hole Quantity:

Port Quantity:

Primary Outlet Thread Diameter:

12 mm

Programming Required:

Push Rod Included:

Reservoir Included:

Yes

Secondary Outlet Thread Diameter:

10 mm

Weight (lb):

3.17 lb

Width (in):

7.7 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:

Select a vehicle to narrow ACDelco 18M320 Brake Master Cylinder fitment info!

Last Updated: 03/09/2024

Years

Vehicle

Per Vehicle

Fit Notes

Fitment Notes

1989

Buick Century

3.3L V6 Gas OHV

1 Professional
with Light Duty Brakes
GM Brake Code JA1
Coupe
2 Doors

Buick Century

3.3L V6 Gas OHV Professional
with Light Duty Brakes
GM Brake Code JA1
Coupe
2 Doors

1 Per Vehicle

1989

Buick Century

3.3L V6 Gas OHV

1 Professional
with Light Duty Brakes
GM Brake Code JA1
Sedan
4 Doors

Buick Century

3.3L V6 Gas OHV Professional
with Light Duty Brakes
GM Brake Code JA1
Sedan
4 Doors

1 Per Vehicle

Buick Century

2.5L L4 Gas OHV,
2.8L V6 Gas OHV

1 Professional
with Light Duty Brakes
GM Brake Code JA1
Coupe
2 Doors

Buick Century

2.5L L4 Gas OHV,
2.8L V6 Gas OHV Professional
with Light Duty Brakes
GM Brake Code JA1
Coupe
2 Doors

1 Per Vehicle

Buick Century

2.5L L4 Gas OHV,
2.8L V6 Gas OHV

1 Professional
with Light Duty Brakes
GM Brake Code JA1
Sedan
4 Doors

Buick Century

2.5L L4 Gas OHV,
2.8L V6 Gas OHV Professional
with Light Duty Brakes
GM Brake Code JA1
Sedan
4 Doors

1 Per Vehicle

Buick Century

3.8L V6 Gas OHV

1 Professional
with Light Duty Brakes
GM Brake Code JA1
Coupe
2 Doors

Buick Century

3.8L V6 Gas OHV Professional
with Light Duty Brakes
GM Brake Code JA1
Coupe
2 Doors

1 Per Vehicle

Buick Century

3.8L V6 Gas OHV

1 Professional
with Light Duty Brakes
GM Brake Code JA1
Sedan
4 Doors

Buick Century

3.8L V6 Gas OHV Professional
with Light Duty Brakes
GM Brake Code JA1
Sedan
4 Doors

1 Per Vehicle

1989

Buick Skyhawk

2.0L L4 Gas OHV

1 Professional

Buick Skyhawk

2.0L L4 Gas OHV Professional

1 Per Vehicle

1988

Buick Skyhawk

2.0L L4 Gas OHV,
2.0L L4 Gas SOHC

1 Professional
with NT Stamped on Booster

Buick Skyhawk

2.0L L4 Gas OHV,
2.0L L4 Gas SOHC Professional
with NT Stamped on Booster

1 Per Vehicle

Buick Skylark

2.3L L4 Gas DOHC,
2.5L L4 Gas OHV,
3.3L V6 Gas OHV

1 Professional
Non-ABS

Buick Skylark

2.3L L4 Gas DOHC,
2.5L L4 Gas OHV,
3.3L V6 Gas OHV Professional
Non-ABS

1 Per Vehicle

1988

Buick Skylark

2.3L L4 Gas DOHC,
2.5L L4 Gas OHV,
3.0L V6 Gas OHV

1 Professional
with NT Stamped on Booster

Buick Skylark

2.3L L4 Gas DOHC,
2.5L L4 Gas OHV,
3.0L V6 Gas OHV Professional
with NT Stamped on Booster

1 Per Vehicle

1987

Buick Somerset

2.5L L4 Gas OHV,
3.0L V6 Gas OHV

1 Professional
with NT Stamped on Booster

Buick Somerset

2.5L L4 Gas OHV,
3.0L V6 Gas OHV Professional
with NT Stamped on Booster

1 Per Vehicle

1988

Cadillac Cimarron

2.8L V6 Gas OHV

1 Professional
with NT Stamped on Booster

Cadillac Cimarron

ACDelco 18M320 Brake Master Cylinder

$73.41

Product Information

Description:

Features and Benefits:

Specifications:

Features and Benefits:

Specifications:

Select a vehicle to narrow ACDelco 18M320 Brake Master Cylinder fitment info!

Buick Century 3.3L V6 Gas OHV

1

Professionalwith Light Duty Brakes GM Brake Code JA1Coupe2 Doors

Buick Century

3.3L V6 Gas OHV Professionalwith Light Duty Brakes GM Brake Code JA1Coupe2 Doors 1 Per Vehicle

Buick Century 3.3L V6 Gas OHV

1

Professionalwith Light Duty Brakes GM Brake Code JA1Sedan4 Doors

Buick Century

3.3L V6 Gas OHV Professionalwith Light Duty Brakes GM Brake Code JA1Sedan4 Doors 1 Per Vehicle

Buick Century 2.5L L4 Gas OHV,2.8L V6 Gas OHV

1

Professionalwith Light Duty Brakes GM Brake Code JA1Coupe2 Doors

Buick Century

2.5L L4 Gas OHV,2.8L V6 Gas OHV Professionalwith Light Duty Brakes GM Brake Code JA1Coupe2 Doors 1 Per Vehicle

Buick Century 2.5L L4 Gas OHV,2.8L V6 Gas OHV

1

Professionalwith Light Duty Brakes GM Brake Code JA1Sedan4 Doors

Buick Century

2.5L L4 Gas OHV,2.8L V6 Gas OHV Professionalwith Light Duty Brakes GM Brake Code JA1Sedan4 Doors 1 Per Vehicle

Buick Century 3.8L V6 Gas OHV

1

Professionalwith Light Duty Brakes GM Brake Code JA1Coupe2 Doors

Buick Century

3.8L V6 Gas OHV Professionalwith Light Duty Brakes GM Brake Code JA1Coupe2 Doors 1 Per Vehicle

Buick Century 3.8L V6 Gas OHV

1

Professionalwith Light Duty Brakes GM Brake Code JA1Sedan4 Doors

Buick Century

3.8L V6 Gas OHV Professionalwith Light Duty Brakes GM Brake Code JA1Sedan4 Doors 1 Per Vehicle

Buick Skyhawk 2.0L L4 Gas OHV

1

Professional

Buick Skyhawk

2.0L L4 Gas OHV Professional 1 Per Vehicle

Buick Skyhawk 2.0L L4 Gas OHV,2.0L L4 Gas SOHC

1

Professionalwith NT Stamped on Booster

Buick Skyhawk

2.0L L4 Gas OHV,2.0L L4 Gas SOHC Professionalwith NT Stamped on Booster 1 Per Vehicle

Buick Skylark 2.3L L4 Gas DOHC,2.5L L4 Gas OHV,3.3L V6 Gas OHV

1

ProfessionalNon-ABS

Buick Skylark

2.3L L4 Gas DOHC,2.5L L4 Gas OHV,3.3L V6 Gas OHV ProfessionalNon-ABS 1 Per Vehicle

Buick Skylark 2.3L L4 Gas DOHC,2.5L L4 Gas OHV,3.0L V6 Gas OHV

1

Professionalwith NT Stamped on Booster

Buick Skylark

2.3L L4 Gas DOHC,2.5L L4 Gas OHV,3.0L V6 Gas OHV Professionalwith NT Stamped on Booster 1 Per Vehicle

Buick Somerset 2.5L L4 Gas OHV,3.0L V6 Gas OHV

1

Professionalwith NT Stamped on Booster

Buick Somerset

2.5L L4 Gas OHV,3.0L V6 Gas OHV Professionalwith NT Stamped on Booster 1 Per Vehicle

Cadillac Cimarron 2.8L V6 Gas OHV

1

Professionalwith NT Stamped on Booster

Cadillac Cimarron

2.8L V6 Gas OHV Professionalwith NT Stamped on Booster 1 Per Vehicle

Chevrolet Beretta 2.2L L4 Gas OHV,2.3L L4 Gas DOHC,3.1L V6 Gas OHV

1

Professional

Chevrolet Beretta

2.2L L4 Gas OHV,2.3L L4 Gas DOHC,3.1L V6 Gas OHV Professional 1 Per Vehicle

Chevrolet Beretta 2.2L L4 Gas OHV,2.3L L4 Gas DOHC,3.1L V6 Gas OHV

1

Professionalwith NT Stamped on Booster

Chevrolet Beretta

2.2L L4 Gas OHV,2.3L L4 Gas DOHC,3.1L V6 Gas OHV Professionalwith NT Stamped on Booster 1 Per Vehicle

Chevrolet Beretta 2.0L L4 Gas OHV,2.8L V6 Gas OHV

Buick Century

3.3L V6 Gas OHV

Professional
with Light Duty Brakes
GM Brake Code JA1
Coupe
2 Doors

3.3L V6 Gas OHV Professional
with Light Duty Brakes
GM Brake Code JA1
Coupe
2 Doors

1 Per Vehicle

Buick Century

3.3L V6 Gas OHV

Professional
with Light Duty Brakes
GM Brake Code JA1
Sedan
4 Doors

3.3L V6 Gas OHV Professional
with Light Duty Brakes
GM Brake Code JA1
Sedan
4 Doors

1 Per Vehicle

Buick Century

2.5L L4 Gas OHV,
2.8L V6 Gas OHV

Professional
with Light Duty Brakes
GM Brake Code JA1
Coupe
2 Doors

2.5L L4 Gas OHV,
2.8L V6 Gas OHV Professional
with Light Duty Brakes
GM Brake Code JA1
Coupe
2 Doors

1 Per Vehicle

Buick Century

2.5L L4 Gas OHV,
2.8L V6 Gas OHV

Professional
with Light Duty Brakes
GM Brake Code JA1
Sedan
4 Doors

2.5L L4 Gas OHV,
2.8L V6 Gas OHV Professional
with Light Duty Brakes
GM Brake Code JA1
Sedan
4 Doors

1 Per Vehicle

Buick Century

3.8L V6 Gas OHV

Professional
with Light Duty Brakes
GM Brake Code JA1
Coupe
2 Doors

3.8L V6 Gas OHV Professional
with Light Duty Brakes
GM Brake Code JA1
Coupe
2 Doors

1 Per Vehicle

Buick Century

3.8L V6 Gas OHV

Professional
with Light Duty Brakes
GM Brake Code JA1
Sedan
4 Doors

3.8L V6 Gas OHV Professional
with Light Duty Brakes
GM Brake Code JA1
Sedan
4 Doors

1 Per Vehicle

Buick Skyhawk

2.0L L4 Gas OHV

2.0L L4 Gas OHV Professional

1 Per Vehicle

Buick Skyhawk

2.0L L4 Gas OHV,
2.0L L4 Gas SOHC

Professional
with NT Stamped on Booster

2.0L L4 Gas OHV,
2.0L L4 Gas SOHC Professional
with NT Stamped on Booster

1 Per Vehicle

Buick Skylark

2.3L L4 Gas DOHC,
2.5L L4 Gas OHV,
3.3L V6 Gas OHV

Professional
Non-ABS

2.3L L4 Gas DOHC,
2.5L L4 Gas OHV,
3.3L V6 Gas OHV Professional
Non-ABS

1 Per Vehicle

Buick Skylark

2.3L L4 Gas DOHC,
2.5L L4 Gas OHV,
3.0L V6 Gas OHV

Professional
with NT Stamped on Booster

2.3L L4 Gas DOHC,
2.5L L4 Gas OHV,
3.0L V6 Gas OHV Professional
with NT Stamped on Booster

1 Per Vehicle

Buick Somerset

2.5L L4 Gas OHV,
3.0L V6 Gas OHV

Professional
with NT Stamped on Booster

2.5L L4 Gas OHV,
3.0L V6 Gas OHV Professional
with NT Stamped on Booster

1 Per Vehicle

Cadillac Cimarron

2.8L V6 Gas OHV

Professional
with NT Stamped on Booster

2.8L V6 Gas OHV Professional
with NT Stamped on Booster

1 Per Vehicle

Chevrolet Beretta

2.2L L4 Gas OHV,
2.3L L4 Gas DOHC,
3.1L V6 Gas OHV

2.2L L4 Gas OHV,
2.3L L4 Gas DOHC,
3.1L V6 Gas OHV Professional

1 Per Vehicle

Chevrolet Beretta

2.2L L4 Gas OHV,
2.3L L4 Gas DOHC,
3.1L V6 Gas OHV

Professional
with NT Stamped on Booster

2.2L L4 Gas OHV,
2.3L L4 Gas DOHC,
3.1L V6 Gas OHV Professional
with NT Stamped on Booster

1 Per Vehicle

Chevrolet Beretta

2.0L L4 Gas OHV,
2.8L V6 Gas OHV

Professional
with NT Stamped on Booster

2.0L L4 Gas OHV,
2.8L V6 Gas OHV Professional
with NT Stamped on Booster

1 Per Vehicle

Chevrolet Cavalier

2.2L L4 Gas OHV,
3.1L V6 Gas OHV

2.2L L4 Gas OHV,
3.1L V6 Gas OHV Professional

1 Per Vehicle

Chevrolet Cavalier

2.0L L4 Gas OHV,
2.8L V6 Gas OHV

2.0L L4 Gas OHV,
2.8L V6 Gas OHV Professional

1 Per Vehicle