Search  for anything...

ACDelco Professional 18M27 Brake Master Cylinder Assembly

  • Based on 5 reviews
Condition: New
Checking for product changes

Buy Now, Pay Later


As low as $9.77 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

This item is eligible for return within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: Only 8 left in stock, order soon!
Fulfilled by Amazon

Arrives Thursday, Dec 26
Order within 22 hours and 5 minutes
Available payment plans shown during checkout

Features

  • 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
  • Fit type: Vehicle Specific
  • 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
  • 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

Manufacturer: ‎ACDelco


Brand: ‎ACDelco


Model: ‎ACDelco - Brake Master Cy (Slp) (18M27)


Item Weight: ‎8.45 pounds


Product Dimensions: ‎9.4 x 5.8 x 4.8 inches


Country of Origin: ‎China


Item model number: ‎18M27


Is Discontinued By Manufacturer: ‎Yes


Manufacturer Part Number: ‎18M27


OEM Part Number: ‎18030269


Domestic Shipping: Item can be shipped within U.S.


Date First Available: October 10, 2007


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Dec 26

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Ac-Delco Master Cylinder
First the cap is not like the picture shows but a very cheap chrome plating.Also the picture shows Made in the USA. This master cylinder is marked as made in china.Back to Amazon it goes.
Reviewed in the United States on October 4, 2013 by Pana

  • Delco Corvette Master cylinder
This product is as expected.Very good part. I will buy this product if I ever need another one. Thank you very much.
Reviewed in the United States on August 23, 2013 by Frank L. Conner

  • bad and last for amazon
old rusted unit ended up using it for a core at napa - first, bad and last for amazon.
Reviewed in the United States on October 13, 2014 by roger norris

  • Made in China
Made in China, not USA like the photo shows.
Reviewed in the United States on October 13, 2019 by Justin

Can't find a product?

Find it on Amazon first, then paste the link below.