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Old 06-18-2017, 07:35 AM   #1
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rebuilding brakes with question about bearings/axle in disk brake rear

So I am replacing my brake system(had to replace all the rear hard lines along with hoses and calipers) and I was taking the rear axles out to check the bearings, paint things, and replace the rotors in the rear and discovered the weird setup these things have in the hub. I've never been a GM guy and my GM friend says this insert is in the wrong way. There is a little cup between the outer bearings and the flange on the outside the axle teeth go into. This cup fits up against the inside of hub and keeps the bearing from coming out and has a few little punched out parts that allow you to push a new bearing in but wont let the old bearing come out. My GM buddy thinks the bearings were replaced and this should go the other way around letting you pull the bearings out but not let you put new bearings in unless you drive the race out, take the bearings out, drop in the new ones, and knock the new race in. The only reason I take time to think he is right is the bearings look brand new except the cages have a few dents from where they were knocked over these clips. Plus the clips are so close it looks like they hung up on the nuts lock washer and ripped some of the arms off. If it was flipped around the other way the little clips couldn't reach. I'll try to post a picture. It was getting dark when we called it a day. I came home and tried to find it in my service manual but in the axle section I didn't see any with disk brakes that had a setup like mine.
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Old 06-18-2017, 10:31 AM   #2
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There are several long disc brake threads. I'd wake up the ones that seem relevant by posting on them, as that will alert those who posted.

Link your post there to this thread.
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Old 06-18-2017, 04:20 PM   #3
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Got it all rebuilt. I think I will need a new hub at some point though.
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Old 06-19-2017, 05:03 AM   #4
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Attachment 287801Attachment 287802
Got it all rebuilt. I think I will need a new hub at some point though.
Nice job. I assume you figured out to your satisfaction how the parts go together. I've not worked on the rear disc style of axle so I had nothing of value to add.

If you don't have copies of the various GM shop manuals that are available it might be worth it to you to pick up copies. The first one listed below is the Unit repair manual and might have the info you were looking for on the rear axles.

1977 GM Light Duty Truck Unit Service Manual

1977 GM Light Duty Shop Manual

1977 GM Emissions Control Manual

1977 GM Truck Wiring Diagrams


Brad
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Old 06-19-2017, 08:40 AM   #5
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Well the piece didn't really make a huge difference it only helped with assembly(kept the bearing from falling out) and it was more for argument sake thing. I'm waiting on replacement nut keepers that I ordered to be genuinely done but I didnt want to leave it immobile and exposed to the elements. I think I'm going to run all new hard brake lines. The two in the back both started leaking on the short drive home. I feel like making one more crazy long one and a few shorts will be worth it.


Thanks everyone for the help.
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Old 06-19-2017, 08:57 AM   #6
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This is a blow up I found online. Didn't have this in my p30 shop manual. They had so many rear axle setups just none with the disk brakes.
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