Brake booster: 1/2 to 3/4 ton - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sierra · 05-28-2002, 09:06 PM

Sometime ago, one of our board members mentioned he had solved a problem (can't remember precisely) by replacing the original 1/2-ton brake booster with a 3/4-ton booster. My truck has a rebuilt Delco booster, with all new brake hardware, but the pedal effort is still sort of between manual and power brakes. My question is, will the 3/4-ton booster bolt right in, and will it decrease pedal effort? My engine idles at about 14" Hg, though I have not seen this vacuum level to be a problem on past projects. The parts stores list only one replacement part # for the 3/4-ton truck booster, but it sure looks like a larger, yet still bolt-on version of the Delco 1/2-ton unit. Anybody had any experience with this? Thanks!

Longhorn Man · 05-28-2002, 09:26 PM

I wonder if the check valve (white plastic elbow) on the fitting of your booster is good.
14 inches should be plenty, and even if it wasn't, you would have good pedal feel untill you hit the brakes 2 or 3 times and used all your stored vacume.
All the power set ups I have driven were touchey.

imdarren · 05-28-2002, 09:29 PM

I installed a 3/4 tom booster in my truck. It stops on a dime with very little effort. I love it. It was a direct bolt in. I went from manual brakes directly to a 3/4 ton booster, so I can't give a fair comparison of a 1/2 ton booster VS a 3/4 ton. Sorry.
Darren

BLACK AND BLUE 67-72 · 05-28-2002, 09:46 PM

Aren't the 1/2 ton like 7" and 3/4 ton a 9" ? If so I would say that the 3/4 ton would help out with pedal feel and stopping power.

05-28-2002, 09:06 PM	#1
Sierra Registered User Join Date: Nov 2000 Location: Victoria, Texas Posts: 71	Brake booster: 1/2 to 3/4 ton Sometime ago, one of our board members mentioned he had solved a problem (can't remember precisely) by replacing the original 1/2-ton brake booster with a 3/4-ton booster. My truck has a rebuilt Delco booster, with all new brake hardware, but the pedal effort is still sort of between manual and power brakes. My question is, will the 3/4-ton booster bolt right in, and will it decrease pedal effort? My engine idles at about 14" Hg, though I have not seen this vacuum level to be a problem on past projects. The parts stores list only one replacement part # for the 3/4-ton truck booster, but it sure looks like a larger, yet still bolt-on version of the Delco 1/2-ton unit. Anybody had any experience with this? Thanks!

05-28-2002, 09:29 PM	#3
imdarren Registered User Join Date: Oct 2001 Location: SW Washington Posts: 1,006	I installed a 3/4 tom booster in my truck. It stops on a dime with very little effort. I love it. It was a direct bolt in. I went from manual brakes directly to a 3/4 ton booster, so I can't give a fair comparison of a 1/2 ton booster VS a 3/4 ton. Sorry. Darren __________________ Washington State 1967 Chevy C10 LWB Rodstoration In Progress. 1972 K20 Cheyenne Super

05-28-2002, 09:46 PM	#4
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Aren't the 1/2 ton like 7" and 3/4 ton a 9" ? If so I would say that the 3/4 ton would help out with pedal feel and stopping power. __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

05-28-2002, 09:26 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	I wonder if the check valve (white plastic elbow) on the fitting of your booster is good. 14 inches should be plenty, and even if it wasn't, you would have good pedal feel untill you hit the brakes 2 or 3 times and used all your stored vacume. All the power set ups I have driven were touchey.



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