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Joined: May 2016
Posts: 26
2
'Bolter
'Bolter
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Joined: May 2016
Posts: 26
In the process of redoing my brakes. Rebuild was in the plans for the master cylinder as the bore looks good as do threads and the rest.
Piston bore is 1.25 inch not the 1.0 bore found at Napa and the like.
I have seen 1.25 listed for 3/4 ton, but thought mine was a 1/2.
Can Anyone shed some light on this? Did I ID the truck incorrectly?
More importantly who sells a kit. (JC is on back order).
Thanks.

Joined: Sep 2010
Posts: 2,306
K
'Bolter
'Bolter
K Offline
Joined: Sep 2010
Posts: 2,306
Try rock auto they have the complete master or you can try a part number search


1954 Canadian GMC 9300
"The Journey"
Follow in the DITY
Joined: Sep 2001
Posts: 29,269
Bubba - Curmudgeon
Bubba - Curmudgeon
Joined: Sep 2001
Posts: 29,269

Joined: Apr 2005
Posts: 2,832
C
'Bolter
'Bolter
C Offline
Joined: Apr 2005
Posts: 2,832
The 3100 (1/2T) needs a 1" bore. The 3/4T 1.250 bore will require King Kong to give enough pedal pressure to stop.


Evan
Joined: May 2016
Posts: 26
2
'Bolter
'Bolter
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Joined: May 2016
Posts: 26
I’m about 230 with a size 12 foot. So I’ll try. 🙂 Just a few wondering if this would indicate 1/2, 3/4....or a panel truck option. So thanks. It looks original to me.
I have a rebuild kit on back order from JC.

Joined: Mar 2002
Posts: 9,115
'Bolter
'Bolter
Joined: Mar 2002
Posts: 9,115
So there are differences in the 1/2 3/4 and 1 Ton. I guess the first question would be, how many lugs are used on the wheels. A half ton has six.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Joined: May 2016
Posts: 26
2
'Bolter
'Bolter
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Joined: May 2016
Posts: 26
Yep, six lug.

Joined: May 2016
Posts: 26
2
'Bolter
'Bolter
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Joined: May 2016
Posts: 26
The is also a helper or overload spring on the rear. Don’t know if that means anything


Moderated by  MNSmith, Rusty Rod 

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