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ACDelco 18M938 | Brake Master Cylinder
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ACDelco 18M938 | Brake Master Cylinder

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$53.99
Part Number
ACD18M938
UPC:
707773315354
Condition:
New
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Description

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

BRAND: ACDelco

FEATURES:

  • Buick;Chevrolet;GMC;Jeep;Oldsmobile;Pontiac
  • 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

SPECIFICS:

Bleeder Hoses IncludedYes
Brake Booster IncludedNo
FAQ - Answer 1No, but it is a good idea to inspect them for wear-out, cracking, leaking etc.
FAQ - Answer 2Yes, ACDelco also offers GM OE brake cylinders.
FAQ - Answer 3Yes, ACDelco Professional Brake Cylinders come with a 12 month / unlimited mile warranty.
FAQ - Question 1Do I have to replace all my brake parts when replacing my brake cylinder?
FAQ - Question 2Does ACDelco offer other grades of brake cylinders?
FAQ - Question 3Are these brake parts durable?
Good Maintenance Practices - Section 1 - Bullet 1Check brake fluid level at every oil change. Replace fluid according to owner's manual recommendations.
Good Maintenance Practices - Section 1 - Bullet 2Calipers and wheel cylinders should be checked every brake inspection and serviced or replaced as required.
Good Maintenance Practices - Section 1 - Bullet 3Inspect the brake lines for rust, punctures, or visible leaks (You may be able to do this, but consult a qualified technician if necessary).
Good Maintenance Practices - Section 1 - Bullet 4Check the thickness of your brake pads.
Good Maintenance Practices - Section 1 - HeaderThe following inspections and maintenance procedures can help prevent potential brake problems:
Good Maintenance Practices - Section 2 - Bullet 1Inspection of the brake hoses for brittleness or cracking.
Good Maintenance Practices - Section 2 - Bullet 2Inspection of brake lining and pads for wear or contamination by brake fluid or grease.
Good Maintenance Practices - Section 2 - Bullet 3Inspection of wheel bearings and grease seals.
Good Maintenance Practices - Section 2 - Bullet 4Parking brake adjustments (as needed).
Good Maintenance Practices - Section 2 - HeaderThe following should be conducted by a qualified technician:
Height (in)4.8
Length (in)9.4
Master Cylinder Cap IncludedYes
Master Cylinder MaterialCast Iron
Mounting Bracket IncludedNo
Mounting Hole Quantity2
Port Quantity2
Programming RequiredNo
Pushrod IncludedNo
Reservoir IncludedYes
Signs of Wear & Troubleshooting - Section 1 - Bullet 1Brake warning light is on.
Signs of Wear & Troubleshooting - Section 1 - Bullet 2Fluid spots beneath the car, indicating there may be a leak within the cylinder.
Signs of Wear & Troubleshooting - Section 1 - Bullet 3Difficulty stopping the vehicle.
Signs of Wear & Troubleshooting - Section 1 - Bullet 4A low or sinking brake pedal.
Signs of Wear & Troubleshooting - Section 1 - HeaderBrake cylinder signs of wear include:
Weight (lb)4.77
Width (in)5.8

DOWNLOADS:

APPLICATIONS:

  • 1965-1966 GMC I2500 - Position: N/A
    • w/ Booster Brakes
  • 1965-1965 GMC 2500 Series - Position: N/A
    • w/ Booster Brakes
  • 1964-1966 GMC G1000 Series - Position: N/A
    • w/o Brake Booster
  • 1966-1966 Pontiac Grand Prix - Position: N/A
    • Except MORAINE Master Cylinder Vehicles Built for Canadian Market
  • 1964-1966 Chevrolet K20 Pickup - Position: N/A
  • 1966-1966 GMC K1000 Pickup - Position: N/A
  • 1964-1965 Jeep Wagoneer - Position: N/A
  • 1962-1962 Pontiac Catalina - Position: N/A
    • w/ 2 Stud Mounting Except BENDIX Master Cylinder Vehicles Built For United States Market
  • 1963-1966 Chevrolet C20 Pickup - Position: N/A
    • w/ Round Reservoir
  • 1962-1966 Chevrolet Impala - Position: N/A
    • 1" Bore Diameter Except Metallic Lining
  • 1963-1966 Chevrolet K10 Pickup - Position: N/A
    • Except BENDIX Master Cylinder
  • 1964-1966 Chevrolet G10 Van - Position: N/A
  • 1964-1966 Chevrolet El Camino - Position: N/A
    • Except Metallic Lining
  • 1964-1966 GMC I1000 - Position: N/A
  • 1962-1966 Chevrolet Bel Air - Position: N/A
    • Except Metallic Lining 1" Bore Diameter
  • 1964-1965 GMC 1000 Series - Position: N/A
  • 1965-1966 Chevrolet Malibu - Position: N/A
    • Except Metallic Lining 1" Bore Diameter
  • 1964-1965 GMC 1500 Series - Position: N/A
  • 1962-1966 Chevrolet Chevy II - Position: N/A
    • 1" Bore Diameter Except Metallic Lining
  • 1965-1966 Chevrolet Chevelle - Position: N/A
    • 1" Bore Diameter Except Metallic Lining
  • 1966-1966 Chevrolet Caprice - Position: N/A
    • Except Heavy Duty Brakes
  • 1966-1966 GMC K1000 - Position: N/A
  • 1966-1966 Jeep Wagoneer - Position: N/A
    • w/ Single Piston Master Cylinder
  • 1962-1962 Pontiac Catalina - Position: N/A
    • w/ 2 Stud Mounting Except BENDIX Master Cylinder Vehicles Built For United States Market Catalina
  • 1966-1966 GMC K15/K1500 Pickup - Position: N/A
  • 1964-1964 Chevrolet Chevelle - Position: N/A
    • Except Heavy Duty Brakes
  • 1962-1962 Pontiac Bonneville - Position: N/A
    • Except BENDIX Master Cylinder Except MORAINE Master Cylinder Vehicles Built for Canadian Market
  • 1966-1966 GMC 1000 - Position: N/A
  • 1966-1966 GMC 2500 - Position: N/A
    • w/ Booster Brakes
  • 1966-1966 GMC 1500 - Position: N/A
  • 1962-1966 Chevrolet Biscayne - Position: N/A
    • 1" Bore Diameter Except Metallic Lining
  • 1966-1966 Pontiac Star Chief - Position: N/A
    • Vehicles Built for Canadian Market
  • 1962-1965 Pontiac Grand Prix - Position: N/A
    • Except MORAINE Master Cylinder
  • 1965-1966 GMC I1500 - Position: N/A
  • 1964-1966 GMC Suburban - Position: N/A

Attributes
Product type:
Aftermarket
Product Description:
Brake Master Cylinder Assembly
Programming Required:
No
Mounting Bracket Included:
No
Mounting Hole Quantity:
2
Port Quantity:
2
Reservoir Included:
Yes
Hazardous Material:
No
Minimum Order Quantity:
1
Features & Benefits - Bullet 2:
Pressure tested to ensure safe and confident braking
Features & Benefits - Bullet 4:
Geometrical tolerance ensures that the body and plastic reservoir match for a proper fit
Features & Benefits - Bullet 3:
Cast iron and aluminum specifications; no extra stress on the brake boosting mounting
Features & Benefits - Bullet 1:
Meets the brake performance requirements of SAE J1153 and J1154 testing, providing reliability and quality
Weight (lb) (Pound):
4.77
Height (in) (Inch):
4.8
Width (in) (Inch):
5.8
Length (in) (Inch):
9.4
Signs of Wear & Troubleshooting - Section 1 - Bull:
Fluid spots beneath the car, indicating there may be a leak within the cylinder.
Signs of Wear & Troubleshooting - Section 1 - Bull:
Difficulty stopping the vehicle.
Signs of Wear & Troubleshooting - Section 1 - Bull:
Brake warning light is on.
Signs of Wear & Troubleshooting - Section 1 - Bull:
A low or sinking brake pedal.
Life Cycle Status:
Announced
FAQ - Answer 2:
Yes, ACDelco also offers GM OE brake cylinders.
Life Cycle Status Description:
Announced - Part has been announced to customers on a paper “New Number Announcement”. Part is active.
FAQ - Question 3:
Are these brake parts durable?
Item Level GTIN:
00707773315354
FAQ - Question 1:
Do I have to replace all my brake parts when replacing my brake cylinder?
FAQ - Question 2:
Does ACDelco offer other grades of brake cylinders?
Signs of Wear & Troubleshooting - Section 1 - Head:
Brake cylinder signs of wear include:
Features & Benefits - Bullet 5:
Piston assembly and return spring help to prevent brake drag, which can cause premature brake pad wear
FAQ - Answer 1:
No, but it is a good idea to inspect them for wear-out, cracking, leaking etc.
Good Maintenance Practices - Section 1 - Bullet 1:
Check brake fluid level at every oil change. Replace fluid according to owner's manual recommendations.
Good Maintenance Practices - Section 1 - Bullet 2:
Calipers and wheel cylinders should be checked every brake inspection and serviced or replaced as required.
Good Maintenance Practices - Section 1 - Bullet 3:
Inspect the brake lines for rust, punctures, or visible leaks (You may be able to do this, but consult a qualified technician if necessary).
Good Maintenance Practices - Section 1 - Bullet 4:
Check the thickness of your brake pads.
FAQ - Answer 3:
Yes, ACDelco Professional Brake Cylinders come with a 12 month / unlimited mile warranty.
Good Maintenance Practices - Section 1 - Header:
The following inspections and maintenance procedures can help prevent potential brake problems:
Good Maintenance Practices - Section 2 - Bullet 1:
Inspection of the brake hoses for brittleness or cracking.
Good Maintenance Practices - Section 2 - Bullet 2:
Inspection of brake lining and pads for wear or contamination by brake fluid or grease.
Good Maintenance Practices - Section 2 - Bullet 3:
Inspection of wheel bearings and grease seals.
Good Maintenance Practices - Section 2 - Bullet 4:
Parking brake adjustments (as needed).
Good Maintenance Practices - Section 2 - Header:
The following should be conducted by a qualified technician:
Pushrod Included:
No
Master Cylinder Cap Included:
Yes
Master Cylinder Material:
Cast Iron
Brake Booster Included:
No
Bleeder Hoses Included:
Yes
Primary Outlet Thread Diameter (Inch):
0.437
Master Cylinder Bore Diameter (Inch):
1
Primary Outlet Thread Diameter (Millimeter):
11.112
Master Cylinder Bore Diameter (Millimeter):
25.4
Country of Origin:
China
Weight - Each (Gross Pounds):
04.77
Height - Each (Inch):
04.80
Length - Each (Inch):
09.40
Width - Each (Inch):
05.80



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