Vacuum question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jayschevy · 02-24-2013, 06:41 PM

I purchased a 71 C10 last summer. The truck runs great. The PO rebuilt the engine adding a HEI and a bigger carb. I love the truck but did'nt like the manual brakes so I just added power brakes. However, the brakes still feel like manual brakes. After checking my vacuum, my question is what should my vacuum range be for my booster to work properly? I'm getting between 13 to 15 vacuum readings (mostly 13 - 14). Is this enough vacuum for the booster?
I've check and don't see any area's where I may be loosing vacuum. I read somewhere that some modified engines do not put out as much vacuum.
What are my options? Is 13-15 vacuum readings good and or should I just add a hydroboost brake system?

02-24-2013, 06:41 PM	#1
Jayschevy Registered User Join Date: May 2012 Location: Eastern, NC Posts: 429	Vacuum question I purchased a 71 C10 last summer. The truck runs great. The PO rebuilt the engine adding a HEI and a bigger carb. I love the truck but did'nt like the manual brakes so I just added power brakes. However, the brakes still feel like manual brakes. After checking my vacuum, my question is what should my vacuum range be for my booster to work properly? I'm getting between 13 to 15 vacuum readings (mostly 13 - 14). Is this enough vacuum for the booster? I've check and don't see any area's where I may be loosing vacuum. I read somewhere that some modified engines do not put out as much vacuum. What are my options? Is 13-15 vacuum readings good and or should I just add a hydroboost brake system?

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