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

69 COPO · 01-17-2009, 10:49 AM

I have a 1971 Chevy Super Cheyenne 4x4 I'm restoring. I have a couple of master cyl. One is a larger body with 2 reservoir the same. And the other has a larger up front and a smaller reservoir in back. Does anyone know which is correct.

Wrenchbender Ret · 01-17-2009, 05:39 PM

The one with the large & small resorvoir is for the disc brakes that you have.

dave2953 · 01-17-2009, 06:06 PM

Quote:

Originally Posted by Wrenchbender Ret

The one with the large & small resorvoir is for the disc brakes that you have.

X2 I think the other one you have is for a drum/drum application.

cparman · 01-17-2009, 06:11 PM

Not 100% sure, but I think that is the difference between a Moraine and a Bendix power booster. I know that you could get either on my 72 Blazer, and the master cylinders are different for each. ( I too have one of each ). If you go to NAPA's web site and look up a master cylinder for you truck, I think it will ask the question which booster do you have. They have pictures on their site to help you identify which booster you have.

**72 Super** · 01-17-2009, 06:28 PM

If you have a Delco booster, your master cylinder should be the oval shaped one with both the same sized resevoirs.

Ray

69 COPO · 01-18-2009, 04:52 PM

So you guys are saying either could be OK. Thanks

**john** · 01-18-2009, 05:30 PM

Here is my delco mc.

Andy4639 · 01-18-2009, 05:55 PM

1971 Chevy with factory disc brakes. I just replaced this booster and the master cyclinder is one I replaced a few years ago. It is a direct replacement for the orignal one.

71 super · 01-18-2009, 06:41 PM

Easy way to tell which type brakes you have is if the booster is black it is bendix, if gold/cadmium plated it is a delco- delco also has delco-moraine stamped into the case. Either m/c will work on either booster. My 71 has delco booster with bendix master, and 72 has delco /delco combo. If you have you original take it in- you will need it for a core anyway- and get the same configuration to go back with.

01-17-2009, 10:49 AM	#1
69 COPO Registered User Join Date: Feb 2005 Location: S.E. South Dakota Posts: 161	Question on Brake Master Cylinder I have a 1971 Chevy Super Cheyenne 4x4 I'm restoring. I have a couple of master cyl. One is a larger body with 2 reservoir the same. And the other has a larger up front and a smaller reservoir in back. Does anyone know which is correct.

01-17-2009, 05:39 PM	#2
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,207	Re: Question on Brake Master Cylinder The one with the large & small resorvoir is for the disc brakes that you have.

01-17-2009, 06:11 PM	#4
cparman sharp as a marble Join Date: Jan 2007 Location: atlantic beach,florida Posts: 1,082	Re: Question on Brake Master Cylinder Not 100% sure, but I think that is the difference between a Moraine and a Bendix power booster. I know that you could get either on my 72 Blazer, and the master cylinders are different for each. ( I too have one of each ). If you go to NAPA's web site and look up a master cylinder for you truck, I think it will ask the question which booster do you have. They have pictures on their site to help you identify which booster you have.

01-17-2009, 06:28 PM	#5
72 Super Senior Member Join Date: Jul 2001 Location: Hyattsville, Maryland Posts: 3,684	Re: Question on Brake Master Cylinder If you have a Delco booster, your master cylinder should be the oval shaped one with both the same sized resevoirs. Ray __________________ 72 Cheyenne Super (Purchased new by my parents in August of 71) Black and White

01-18-2009, 04:52 PM	#6
69 COPO Registered User Join Date: Feb 2005 Location: S.E. South Dakota Posts: 161	Re: Question on Brake Master Cylinder So you guys are saying either could be OK. Thanks

01-18-2009, 05:30 PM	#7
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Question on Brake Master Cylinder Here is my delco mc. Attached Images __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

01-18-2009, 05:55 PM	#8
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: Question on Brake Master Cylinder 1971 Chevy with factory disc brakes. I just replaced this booster and the master cyclinder is one I replaced a few years ago. It is a direct replacement for the orignal one. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

01-18-2009, 06:41 PM	#9
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,079	Re: Question on Brake Master Cylinder Easy way to tell which type brakes you have is if the booster is black it is bendix, if gold/cadmium plated it is a delco- delco also has delco-moraine stamped into the case. Either m/c will work on either booster. My 71 has delco booster with bendix master, and 72 has delco /delco combo. If you have you original take it in- you will need it for a core anyway- and get the same configuration to go back with. __________________ 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



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