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Joined: Aug 2018
Posts: 46
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Wrench Fetcher
Wrench Fetcher
D Offline
Joined: Aug 2018
Posts: 46
Is there any reason not to use the master cylinder from a 52 half ton on a 50 or 51 half ton? The 51 and 52 masters are 1 & 1/8 bore where the 50s are a 1 inch bore.

This will be going on a 50 with Bendix brakes.


1950 GMC 1/2 Ton Long Box
228-Zenith carb- SM420-bendix brakes
Joined: Jun 2004
Posts: 8,597
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Riding in the Passing Lane
Riding in the Passing Lane
W Offline
Joined: Jun 2004
Posts: 8,597
The small bore will give more braking with less pedal pressure but will require more frequent adjustments. The Bendix brakes come on 51 up 1/2 ton models so the larger bore would match the factory setup.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
In the Gallery Forum
Joined: Jun 2011
Posts: 5,096
E
Crusing in the Passing Lane
Crusing in the Passing Lane
E Offline
Joined: Jun 2011
Posts: 5,096
While the smaller bore will result in less Pedel pressure like Wrenchbender says, you could run out of fluid volume.

Ed

Last edited by EdPruss; 08/28/2018 2:44 AM.

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.

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