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Old 11-11-2019, 06:52 PM   #1
aaronp
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Default '74 Loadstar 1600 dump truck brake help

We have a 74 IH Loadstar 1600 single axle dump truck on our ranch with no brake master cylinder. Its a 345 AMC, 4spd auto, manual brakes, non-power. Any idea where I can get a master cylinder? Its a single banjo fitting port on front drivers side of the cylinder and a 3 bolt mounting flange on the firewall. Any help is greatly appreciated.
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Old 11-11-2019, 06:59 PM   #2
FDChappie
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Default Re: '74 Loadstar 1600 dump truck brake help

Bring it to a good auto parts store and they can look it up. Follow the line from the MC and I will bet it goes to a hydro boost unit under the drivers seat. They are usually what goes out. Last one I bought was around $400 20 years ago.
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Old 11-11-2019, 07:05 PM   #3
aaronp
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Default Re: '74 Loadstar 1600 dump truck brake help

Theres no master cylinder even on the truck.
This is the master cylinder in question. Not on our truck. http://www.retroaudiolab.com/picture...tarengine2.JPG
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Old 11-11-2019, 07:45 PM   #4
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Default Re: '74 Loadstar 1600 dump truck brake help




This is our truck, banjo block circled in red
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Old 11-11-2019, 08:24 PM   #5
FDChappie
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Default Re: '74 Loadstar 1600 dump truck brake help

Ah, looks like you will have to go to the dealer or junk yard for that.
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Old 11-11-2019, 11:04 PM   #6
Scoutboy74
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Default Re: '74 Loadstar 1600 dump truck brake help

345 AMC? Huh? What the crap?
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Old 12-27-2019, 08:11 PM   #7
aaronp
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Default Re: '74 Loadstar 1600 dump truck brake help

We found the banjo bolt, mounted the new master cylinder. Realized the hydro vac booster was junk, so got a new one from
Napa. Problem is that now the new booster has both 1/2-20 threaded banjo ports on input and output. Old one had a 7/16-20 banjo on the output, so we have to order another banjo. But the brass banjo block/swivel hole is to small for a 1/2-20 banjo and the rubber flex line going from the rubber booster end crimped fitting broke off from rust. So I need to find that hose that goes to a brass Tee on the frame. If anyone knows the part number, any help is appreciated. Its all 1/2-20 inverted flare, with some type of bulkhead fitting type on the frame side going into the tee. If I can find a hose with a banjo block type end for that 1/2-20 banjo bolt and a swivel long threaded 1/2-20 inverted flare section to go into the tee, that will eliminate the need for the brass adapter block on the output of the booster.
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Old 12-27-2019, 08:16 PM   #8
aaronp
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Default Re: '74 Loadstar 1600 dump truck brake help

Its a 4spd manual, not auto. Owner told me wrong.
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Old 12-27-2019, 08:19 PM   #9
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Default Re: '74 Loadstar 1600 dump truck brake help

I came up with case part number 31-664 for the brass banjo adapter swivel.
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