A few pics of the process.
First, remove wheels almost effortlessly in a few minutes
As the drum was removed, saw broken spring and other leaks and problems
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1971 M375 single system rear rebuild
by rjsdotorg on Tue Jun 05, 2018 11:22 pm
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Last edited by rjsdotorg on Tue Jun 05, 2018 11:49 pm, edited 1 time in total.
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Re: 1971 M375 single system rear rebuild
by rjsdotorg on Tue Jun 05, 2018 11:25 pm
This side had a new seal, but slaves leaked
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Re: 1971 M375 single system rear rebuild
by rjsdotorg on Tue Jun 05, 2018 11:27 pm
Slaves honed and polished.
This one isn't quite done.
Used 240 hone, then 320, 400, 600 1500 paper
piston to wall clearance should be <=.006"
assemble with brake system assembly lube
1-3/8 cups then installed
This one isn't quite done.
Used 240 hone, then 320, 400, 600 1500 paper
piston to wall clearance should be <=.006"
assemble with brake system assembly lube
1-3/8 cups then installed
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Last edited by rjsdotorg on Tue Jun 05, 2018 11:55 pm, edited 2 times in total.
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Re: 1971 M375 single system rear rebuild
by rjsdotorg on Tue Jun 05, 2018 11:31 pm
axle had a wear groove from original seal and oil after 60k miles.
Polished the surface and checked the location; the original seal was pressed all the way into the hub.
New National 456648 seals will be tapped just flush and so the lips will ride on clean steel.
Polished the surface and checked the location; the original seal was pressed all the way into the hub.
New National 456648 seals will be tapped just flush and so the lips will ride on clean steel.
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Re: 1971 M375 single system rear rebuild
by rjsdotorg on Tue Jun 05, 2018 11:35 pm
All the parts had to be degreased, power washed, acid rust treated, and heat paint sprayed.
Loose assembly:
self adjusters are smooth and clean
Assembled with spring kit from Alretta Truck parts; spendy but the only ones in existence.
The springs that hook around the casting are a bitch to snap in.
Loose assembly:
self adjusters are smooth and clean
Assembled with spring kit from Alretta Truck parts; spendy but the only ones in existence.
The springs that hook around the casting are a bitch to snap in.
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Re: 1971 M375 single system rear rebuild
by rjsdotorg on Tue Jun 05, 2018 11:42 pm
Best order of assembly:
- adjuster screws and slides etc
- heat shields and cylinders
- shoes and retainer nuts and washers
- adjuster arms and springs
- return springs
- connecting line
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Re: 1971 M375 single system rear rebuild
by rjsdotorg on Tue Jun 05, 2018 11:45 pm
a lower casting
an upper
an upper
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Re: 1971 M375 single system rear rebuild
by rjsdotorg on Tue Jun 05, 2018 11:53 pm
Some notes on parts and such
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Re: 1971 M375 single system rear rebuild
by dirtydeno on Wed Jun 06, 2018 8:43 am
Looks good, this is on my to do list in the next month or so.
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Re: 1971 M375 single system rear rebuild
by rjsdotorg on Wed Jun 06, 2018 9:14 am
dirtydeno wrote:Looks good, this is on my to do list in the next month or so.
If you don't have a torque multiplier or 500lb impact, I cannot recommend it enough.
The springs also definitely require big proper spring tools.
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