The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - New Brakes, It would be nice if they worked, 67 GMC

geezer#99 · 10-16-2021, 11:26 PM

Stock 67pedal ratio is 6 to 1.
You need 4.5 to 1 for power.
Usually a new hole about 1 inch lower gets it done.

How much vacuum does your motor produce at idle.

10-16-2021, 11:26 PM	#7
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,522	Re: New Brakes, It would be nice if they worked, 67 GMC Stock 67pedal ratio is 6 to 1. You need 4.5 to 1 for power. Usually a new hole about 1 inch lower gets it done. How much vacuum does your motor produce at idle.