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M1009 Master Cylinder

Dispatcher7

Member
30
24
8
Location
Pittstown, NY
According to the TM's the original part number is 2232073. Is their a source to buy one? Cross reference to a parts store part? From what I am reading it should be DOT 5 brake fluid, is that right?

Thanks
 

cucvrus

Well-known member
11,263
9,554
113
Location
Jonestown Pennsylvania
I have bought the master cylinder from an auto parts store and used DOT 5 in it. I never had any issues. I did it many times. I keep the DOT 5 in the system because it is there now and worked all these years. No other reason. I use power steering fluid in the power steering regardless that the lube order says ATF is good. Do as you wish. I a simple man. Good Luck.
 

Jeepadict

Well-known member
384
511
93
Location
Round Mountain, NV
I sourced a CUCV master cylinder and booster last year to upgrade my K25. Zero difference in parts from over the counter in a similar era Squarebody (78-86). GM always calls for DOT-3 in the Civvy trucks, so that's what I stick with. In contrast with the power steering, I've had better behavior with ATF...even tho it's arguably the same fluid minus the red coloration...hydraulic fluid is hydraulic fluid for a large percentage of systems.

Sent from my SM-G970U using Tapatalk
 

royalflush55

Well-known member
Steel Soldiers Supporter
643
513
93
Location
Reydon, OK
Both atf and power steering fluid are similar as hydraulic fluid. However atf has detergents and friction modifiers added that the automatic transmission requires.
 
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