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Jul 21st, 2025 | | | | Joined: Feb 2019 Posts: 18 'Bolter | | 'Bolter Joined: Feb 2019 Posts: 18 | Looking for where to buy booster/MC assy.for 39 panel truck. I see Ebay has but ridiculously priced compared to similar units, tia. | | | | | Joined: Mar 2010 Posts: 1,659 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,659 | I would guess the 1939 1/2 ton panel truck uses the same master cylinder as a 1939 1/2 ton truck.
The Master Parts List says 1 inch diameter master cylinder 1938-1946 for a 1/2 ton.
Cast number 5450256. Part number 5454575 correction 5454576. Is this what you have now?
Last edited by buoymaker; 06/12/2022 5:51 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
| | | | | Joined: Jan 2022 Posts: 172 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 172 | I would guess the 1939 1/2 ton panel truck uses the same master cylinder as a 1939 1/2 ton truck.
The Master Parts List says 1 inch diameter master cylinder 1938-1946 for a 1/2 ton.
Cast number 5450256. Part number 5454575. Is this what you have now? The Cast number 5450256 is good but the Part number is 5454576 Chevs of the 40'S has a new one for 178.50. Chevs of the 40'S | | | | | Joined: Mar 2010 Posts: 1,659 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,659 | Thanks for the correction. It's getting harder not to make mistakes.
The poster wants booster and master cylinder.
No other info provided so assume:
* 1/2 ton front and rear drum brakes
* Dual reservoir
* Probably 7" booster (if it will fit)
* Cutting extra hole in floorboard to access new master cylinder fluid fill
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
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