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Vehicle Info Required to Guarantee FitAdd Vehicle

AC Delco®
18M13 OE Replacement Series Brake Master Cylinder With Reservoir

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$101.57Save: $12.58(12%)
Manufacturer #18M13
Vehicle Info Required to Guarantee FitAdd Vehicle


OE Replacement Series
Reservoir Included:
With Reservoir
Replaces OE Number:
With cap and rubber boot
Quantity Sold:
Sold individually
24-months or unlimited mile AC Delco limited warranty
Prop 65 Warning:

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Vehicle Fitment Information

Vehicle Name
Fitment Information
1967 Buick Special
All Engines
With Front Drum Brake, With Rear Drum Brake
1967 Oldsmobile 98
All Engines
Manual Brake System, With Front Drum Brake, With Rear Drum Brake, Except Moraine Master Cylinder
1967 Oldsmobile Cutlass
All Engines
With Front Drum Brake
1967 Oldsmobile Cutlass
Turnpike Cruiser
All Engines
With Front Drum Brake
1967 Oldsmobile Delmont 88
8 Cyl 5.4L
Manual Brake System, Except Moraine Master Cylinder
Page 1 of 13 | Showing 1 - 5 of 64 results

Product Information


Optimize your brake system’s hydraulic performance with the highly durable design and solid protection of ACDelco’s new OE replacement brake master cylinders. Established in 1899, ACDelco manufactures original GM parts and premium OE replacement parts for other brands in the automotive aftermarket.

  • Carefully pressure tested to ensure solid protection
  • Premium, highly durable construction
  • Performs up to SAE J1153 and J1154 standards
  • No hassle to install
  • Engineered to strict OE specifications
Need help?Call our product expert1-866-529-0412
Chat with us
Mondays - Sundays7am - 11pm ET | 4am - 8pm PT
Warranty Policy
Right parts, guaranteed. If you find any defects, let us know within 60 days and we’ll take care of it. Check out our Warranty Policy for more details.
Shipping Policy
We ship fast so you can get on the road that much faster. Check out our Shipping Policy for more details.
Easy Return Policy
We’re only happy if you’re happy. If you’re not entirely satisfied with your order, you may be entitled to a refund. Check out our Return Policy for more details.

Product Q&A

Does this master cylinder have the two bubble, anodized cap and the wire hold down lock just like the original?  In other words, does it look just like the original?Michael M.Apr 24, 2022
Best Answer:Hi Michael, I'm glad to assist you. Yes, this is an AC Delco OEM brand and would exactly match your selected vehicle application. For us to double-check. You can also provide complete information about your vehicle (year, make, model, submodel, and engine size). The 17-character VIN would also be very helpful. If this is a match. Grab our best price offer and click the link below to order this today. I hope this helps. Happy shopping. <a href="https://www.carparts.com/brake-master-cylinder/ac-delco/ac18m13?can=CPJE1043_20220424" target="_blank">https://www.carparts.com/brake-master-cylinder/ac-delco/ac18m13?can=CPJE1043_20220424</a>
Jeonino E.STAFFApr 24, 2022
I have a 70 cutlass with power front drum brakes also is the part in the you are advertising (picture) the part I will be receiving?Pietro D.Sep 20, 2023
Best Answer:Hi Pietro, thank you for reaching out. This item is for the 1970 Oldsmobile Cutlass with a manual braking system. The image shown is only a representation. The actual part is different from the photo. Kindly call our parts team at 1-866-529-0412 and provide the complete vehicle information. We'll be more than glad to help you look for the correct part. Have a nice day.
Aldrin P.STAFFSep 20, 2023
Hi Is the brake master cylinder shown (AC Delco 18M13) an original replacement part or the AC Delco Gold/Professional part? Thanks! (1968 Olds 442 400 ci engine front manual drum brakes)Timothy H.Sep 11, 2022
Best Answer:Hi Timothy, I'm glad to assist you. Yes, it is an OE replacement part, by the AC Delco brand. The premium version with highly durable construction. It performs up to SAE J1153 and J1154 standards and has a 2-year warranty. Grab our low-price offer with 17% off already. Click the link below to order today. Happy shopping! <a href="https://www.carparts.com/brake-master-cylinder/ac-delco/ac18m13?can=CPJE1043_CSQA_20220911" target="_blank">https://www.carparts.com/brake-master-cylinder/ac-delco/ac18m13?can=CPJE1043_CSQA_20220911</a>
Jeonino E.STAFFSep 11, 2022
What size are the female ports?Brian J.Jul 23, 2022
Best Answer:Hi Brian, thank you for reaching out. Here are the specifications of this item: The master cylinder bore diameter is 1 inch. The primary outlet thread diameter is .5 inches. The secondary outlet thread diameter is .5625 inches. You can use this link to go back to the item page and continue the order: <a href="https://www.carparts.com/brake-master-cylinder/ac-delco/ac18m13?can=CPAP3648_20220723" target="_blank">https://www.carparts.com/brake-master-cylinder/ac-delco/ac18m13?can=CPAP3648_20220723</a> I hope this helps. Happy shopping.
Aldrin P.STAFFJul 23, 2022
is the picture shown correct?Steve W.Oct 05, 2020
Best Answer:Hi Steve, The image of the product is only a representation of the part. Product appearance and finish may vary, but fit and function remains the same.
Aldrin P.STAFFOct 05, 2020

Customer Reviews

Looks very nice but it does differ from the picture, the top is bolted on instead of being clamped down
frederick m.
Purchased on Jun 16, 2023
I’m giving carparts the 5 star, but can’t review the actual product. It appears I got the last one of the ac delco in stock, but unfortunately it was another brand in the box that I wasn’t satisfied with. HOWEVER… Carparts made it right by accepting the return and pointing me in the direction of a similar product that was in stock.
Andrew C.
Purchased on Aug 13, 2023