Another brake Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

manimal · 03-01-2007, 09:42 AM

When you install a booster/mc from a 73-up donor,why do you have to extend the pushrod? It does not make sense to me because the throw of the rod should be the same-not increased.Has anybody NOT extended the pushod? Did it work fine? I dont care about the bumper,cause I can fab one if want to.Thanks

Longhorn Man · 03-01-2007, 11:22 AM

The throw does stay the same, however, if it has to reach further to meet the piston, then you'll have to lengthen the pushrod.
While I am unfamiliar with the master cylinder from the ugly years, it sounds like the piston is concave, and you have a further distance to reach.

03-01-2007, 09:42 AM	#1
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Another brake Question When you install a booster/mc from a 73-up donor,why do you have to extend the pushrod? It does not make sense to me because the throw of the rod should be the same-not increased.Has anybody NOT extended the pushod? Did it work fine? I dont care about the bumper,cause I can fab one if want to.Thanks __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

03-01-2007, 11:22 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Another brake Question The throw does stay the same, however, if it has to reach further to meet the piston, then you'll have to lengthen the pushrod. While I am unfamiliar with the master cylinder from the ugly years, it sounds like the piston is concave, and you have a further distance to reach.

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