Hello All,

I have to replace the brake master cylinder in my 03 H2. Long story short: some years ago at a previous owner the fuel pipe got broken in the engine bay and the brake master cylinder reservoir got melted a bit. I decided to completely renew my truck and this will be the upcoming task.
So back to the question: The current brake master cylinder is a 18024944. It seems, the Centric Parts has a brake master cylinder (130.66042) with this GM interchange number. I wanted to buy an AC Delco 18M1107 first, but not sure if it’s the same as the current one.
Is the Centric Parts a good quality? Or should I continue the search for the AC Delco alternative? What would you suggest me if I looked the best?

Thank you!

 

I'd go with that ACDelco you're looking at.

 

Thank you Robert! Even if the interchange number is not mentioned under the AC Delco? This is the only thing that I afraid of.

 

My 2003 H2 has the GM 19209243 master cylinder. Looking through my folder of records, previous owner had it replaced at a dealer in 2015. Looking online this morning, GM shows that is a correct master cylinder, replacing 18047533. (Both are apparently discontinued numbers)
No doubt yours has likely been changed in the past. I checked RockAuto and they show that ACDelco you're looking at as a correct application. Going on 10 plus years, so far RockAuto has not steered me wrong.
I also would not hesitate to use the Raybestos MC390542 master cylinder they list. They do list a more complete cross reference list;
OEM / Interchange Numbers: 18040236, 18043278, 18047533, 18048539, 18060790, 19209243, 19209250

Well I always try to stick to genuine GM or AC Delco, especially on electronic sensors and such.. it's hard to ignore a company that's been making Master cylinders since 1902. One of the few exceptions to the rule👍

 

Thank you for the details. I agree with you, the AC Delco will be my choice.