Master Cylinder - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Noah96 · 11-24-2018, 10:04 AM

Need to replace my master cylinder in my 1969 3/4 ton vacuum boost truck.
Who has the best replacement should I order through auto parts store, rockauto or someone online?

**LockDoc** · 11-24-2018, 10:31 AM

Quote:

Originally Posted by Noah96

Need to replace my master cylinder in my 1969 3/4 ton vacuum boost truck.
Who has the best replacement should I order through auto parts store, rockauto or someone online?

RockAuto has them and I have had good luck ordering from them.

LockDoc

davepl · 11-24-2018, 11:31 AM

Only thing I'd suggest is when dealing with brakes, buy new, not reconditioned, and buy a name brand like Delco or Bendix.

**AussieinNC** · 11-24-2018, 05:56 PM

Critical for you to measure the depth of the hole in the end of the master cylinder piston where it fits against the booster body....and the bore diameter of the original master cylinder....

There are two different bore diameters....

1 1/4" which has a rectangular reservoir cap
AC Delco 18M36288
1 1/8" which has a reservoir cap front and back that are round
AC Delco 18M36246

Buy new unless you like having issues...

Noah96 · 11-24-2018, 07:31 PM

This is what I've come up with and I put it on order gonna try it out.
https://www.autozone.com/brakes-and-...75_0_2558_2877

11-24-2018, 10:04 AM	#1
Noah96 Registered User Join Date: Aug 2016 Location: Danville Wv Posts: 267	Master Cylinder Need to replace my master cylinder in my 1969 3/4 ton vacuum boost truck. Who has the best replacement should I order through auto parts store, rockauto or someone online?

11-24-2018, 11:31 AM	#3
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: Master Cylinder Only thing I'd suggest is when dealing with brakes, buy new, not reconditioned, and buy a name brand like Delco or Bendix. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

11-24-2018, 05:56 PM	#4
AussieinNC Moderator Join Date: Jun 2017 Location: Cherryville, NC Posts: 2,204	Re: Master Cylinder Critical for you to measure the depth of the hole in the end of the master cylinder piston where it fits against the booster body....and the bore diameter of the original master cylinder.... There are two different bore diameters.... 1 1/4" which has a rectangular reservoir cap AC Delco 18M36288 1 1/8" which has a reservoir cap front and back that are round AC Delco 18M36246 Buy new unless you like having issues... __________________ Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox

11-24-2018, 07:31 PM	#5
Noah96 Registered User Join Date: Aug 2016 Location: Danville Wv Posts: 267	Re: Master Cylinder This is what I've come up with and I put it on order gonna try it out. https://www.autozone.com/brakes-and-...75_0_2558_2877



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