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ACDelco Professional 18M118 Brake Master Cylinder Assembly

Free shipping on orders over $29.99

$48.70

$ 22 .99 $22.99

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


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.


Keenan Knox
September 7, 2025
Now I’ve got great stopping power! Don’t have to worry about running into the back of the garage again.
14harley
July 12, 2025
good replacement good price
68redcedar
June 14, 2025
I was surprised when I picked up the package. Lightweight. Aluminum. A magnet finds only the pistons insideSeems to be well casted. Came in a sealed bag. Metal was oily wet. Was not packed very well. Have not yet installed. I'll update if brake feel is improved or run into issues.My current Wagner which was new, not remanufactured, started leaking from the bottom where it joins the brake booster in 4.5 years.It arrived poorly packed, and the white plastic reservoir leaked from the seam and stripped the paint from my then new steering gear. I used an older reservoir to get me 4.5 years.This AC delco came similarly packed. An AC Delco Box in a slightly larger Amazon box, with the MC free to rattle around inside both.Hopefully the lighter weight of this Delco kept it from beating itself up as much.
carl heinze jr
June 4, 2025
have not had this a year and its already leaking im a little shocked should come with a replacement warranty
dan massie
December 17, 2024
easy to use and quality finished work
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