Power Brake Boosters Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BLACK AND BLUE 67-72 · 10-08-2003, 09:56 PM

Why do some of the '67-'72 power brake master cylinders tilt up and some tilt down? mine on my '72 angles down and I have seen others that angle down, but I have seen several that angle up also. Another question what kind of master cylinder should be on a '72 with power brakes? Should it be the double bail oval looking one, or the single bail rectangle one? Everytime I have gotten one they give me the rectangle looking one.

**Stocker** · 10-08-2003, 10:34 PM

Pretty sure mine's all OEM (well, I did replace the master cylinder, but with the same type). It angles down because that's the way the firewall-to-vacuum booster bracket is made. And the MC is the double-bail oval type.

Tx Firefighter · 10-08-2003, 10:36 PM

72 used two different types. 1 bail and 2 bail

1) Delco Moraine
2) Bendix

If the parts guy doesn't ask which one you have when buying a master cylinder, you've got a 50/50 chance.

jorgensensc · 10-08-2003, 10:46 PM

I installed a factory setup on mine and it points down and has 1 bail. I thought mine was wrong, until I saw some others with the same setup.

10-08-2003, 09:56 PM	#1
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Power Brake Boosters Question Why do some of the '67-'72 power brake master cylinders tilt up and some tilt down? mine on my '72 angles down and I have seen others that angle down, but I have seen several that angle up also. Another question what kind of master cylinder should be on a '72 with power brakes? Should it be the double bail oval looking one, or the single bail rectangle one? Everytime I have gotten one they give me the rectangle looking one. __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

10-08-2003, 10:34 PM	#2
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,576	Good question... Pretty sure mine's all OEM (well, I did replace the master cylinder, but with the same type). It angles down because that's the way the firewall-to-vacuum booster bracket is made. And the MC is the double-bail oval type. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

10-08-2003, 10:36 PM	#3
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	72 used two different types. 1 bail and 2 bail 1) Delco Moraine 2) Bendix If the parts guy doesn't ask which one you have when buying a master cylinder, you've got a 50/50 chance. __________________ I'm on the Instagram- @Gearhead_Kevin

10-08-2003, 10:46 PM	#4
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	I installed a factory setup on mine and it points down and has 1 bail. I thought mine was wrong, until I saw some others with the same setup. __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE



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