Is this not the original master cylinder? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

allen123 · 12-30-2008, 10:30 PM

I was needing a new gasket for it and I went up to the store and they didnt have anything like it and they looked in the parts book and the closest gasket that looked like it was out of a mercury. Then he pulled out a whole new cylinder and it looked nothing like mine.

ChevLoRay · 12-30-2008, 10:39 PM

It could be that his replacement M/C is very well different than what you have. As to the gasket, have you looked at the Help Parts displays at O'Reilly's/AutoZone/Advance? Those parts displays have lots of little (so to speak) parts that you and others need for the little (so to speak) jobs that come up. NAPA should be able to find one in their myriad of parts books. If nothing else, what about a GM dealer? Just because these trucks aren't new, doesn't mean that they don't have/can't get a lot of the little parts that are still relevant, even today.

dave2953 · 12-30-2008, 10:54 PM

I agree with ChevLoRay on the "Help" section. Before I swapped to discs I was able to find a gasket for my original master this way.

71 super · 12-30-2008, 11:26 PM

Looks like original m/c to me- bendix type. As others have said check out the help section that is a pretty common m/c setup and there should be one that matches it in that section. You have to be careful with advance and others like them, the counter people have an adversion to using a parts book instead of the computer.

Aarons72s · 12-31-2008, 03:23 AM

I like the spark plug heater hose plug.

:

As to your mastercylinder. It looks like a stock non power master cylinder. I bet they are trying to give you one that has two locking rings and is a little bit larger right? If so you should be fine. Some say you cant swap them for each other. But I have seen both mounted oposite. My green and white had one like you got on it when I got it, and it was factory power brakes. I replaced it when I rebuilt the brakes with a reman one that was the larger, double latched one. That is the correct and original one for my power brake truck. So dont be to concerned with the shape of the replacement. As there are alot of them that interchange.

Just when you get the new one make sure the back is similar and that the hole in the middle of the piston is the same shape and depth. Also make sure the outlets are the same size and in the same location. Good luck.

Sport/Truck · 12-31-2008, 10:08 AM

The one that came with mine looked different, but I changed it out and now it looks like yours.
Has mentioned that you should remove your flex fan?
s/t

allen123 · 12-31-2008, 02:09 PM

Yeah i've been told to get rid of it

12-30-2008, 10:30 PM	#1
allen123 It'll buff out Join Date: Mar 2008 Location: Blanchard,Ok Posts: 1,376	Is this not the original master cylinder? I was needing a new gasket for it and I went up to the store and they didnt have anything like it and they looked in the parts book and the closest gasket that looked like it was out of a mercury. Then he pulled out a whole new cylinder and it looked nothing like mine. __________________ 1972 Chevy c10 swb 2008 CBR600RR Grafitti edition My Build Cody Allen

12-30-2008, 10:39 PM	#2
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Is this not the original master cylinder? It could be that his replacement M/C is very well different than what you have. As to the gasket, have you looked at the Help Parts displays at O'Reilly's/AutoZone/Advance? Those parts displays have lots of little (so to speak) parts that you and others need for the little (so to speak) jobs that come up. NAPA should be able to find one in their myriad of parts books. If nothing else, what about a GM dealer? Just because these trucks aren't new, doesn't mean that they don't have/can't get a lot of the little parts that are still relevant, even today. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

12-30-2008, 10:54 PM	#3
dave2953 Dave's not here, man Join Date: Jun 2004 Location: Winder, Georgia Posts: 2,000	Re: Is this not the original master cylinder? I agree with ChevLoRay on the "Help" section. Before I swapped to discs I was able to find a gasket for my original master this way. __________________ - 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250

12-30-2008, 11:26 PM	#4
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,080	Re: Is this not the original master cylinder? Looks like original m/c to me- bendix type. As others have said check out the help section that is a pretty common m/c setup and there should be one that matches it in that section. You have to be careful with advance and others like them, the counter people have an adversion to using a parts book instead of the computer. __________________ 67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle Last edited by 71 super; 12-30-2008 at 11:27 PM.

12-31-2008, 03:23 AM	#5
Aarons72s Registered User Join Date: Apr 2006 Location: oklahoma Posts: 10,669	Re: Is this not the original master cylinder? I like the spark plug heater hose plug. : As to your mastercylinder. It looks like a stock non power master cylinder. I bet they are trying to give you one that has two locking rings and is a little bit larger right? If so you should be fine. Some say you cant swap them for each other. But I have seen both mounted oposite. My green and white had one like you got on it when I got it, and it was factory power brakes. I replaced it when I rebuilt the brakes with a reman one that was the larger, double latched one. That is the correct and original one for my power brake truck. So dont be to concerned with the shape of the replacement. As there are alot of them that interchange. Just when you get the new one make sure the back is similar and that the hole in the middle of the piston is the same shape and depth. Also make sure the outlets are the same size and in the same location. Good luck.

12-31-2008, 10:08 AM	#6
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Is this not the original master cylinder? The one that came with mine looked different, but I changed it out and now it looks like yours. Has mentioned that you should remove your flex fan? s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

12-31-2008, 02:09 PM	#7
allen123 It'll buff out Join Date: Mar 2008 Location: Blanchard,Ok Posts: 1,376	Re: Is this not the original master cylinder? Yeah i've been told to get rid of it __________________ 1972 Chevy c10 swb 2008 CBR600RR Grafitti edition My Build Cody Allen



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