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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2015 Posts: 208 Shop Shark | | Shop Shark Joined: Jan 2015 Posts: 208 | I am looking for some recommendations (part numbers if possible ) on a master cylinder I can use for firewall mounted vacuum power drum/drum brakes on my 3800. | | | | | Joined: Jun 2005 Posts: 1,001 'Bolter | | 'Bolter Joined: Jun 2005 Posts: 1,001 | I'm sure other bolters here have more experience with this than I do. Not sure what size your bore needs to be, but here's one with 1-1/8": master cylinder
~ Victor 1941 3/4-Ton Pickup (in process). Read about it in the DITY Gallery1955 Grumman Kurbside "Doughboy" 235/3 on tree w/ OD 1957 3100 - moved on 1959 C4500 Short Bus "Magic Bus" - moved on 1959 G3800 1 Ton Dually "Chief" - moved on 1958 C4400 Viking "Thor" ~ moved on to fellow Bolter | | | | | Joined: Mar 2010 Posts: 843 Shop Shark | | Shop Shark Joined: Mar 2010 Posts: 843 | Blind,
A very compact tandem master cylinder with a 1" bore is Bendix 11373. It even has a 1/8" pipe port on its bottom for a brake light switch.
Ray
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