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Thread: Grinding sound when braking after installing new Half Shafts and removing shims

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    Corporal johnhjohnson2's Avatar
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    Default Grinding sound when braking after installing new Half Shafts and removing shims

    Hey guys,

    I took the hmmwv to my buddy's shop today. I replaced both rear half shafts and removed the shims in the rear. There were 2 shims on the passenger side rear and 4 shims on the drivers side rear. I removed all of them as most of the people in post I have read of doing it take them all out. After taking the truck out for a drive I now hear a grinding sound when I apply the break. It sounds something grinding as it rotates not steady like if brake pads were gone. I did not have this issue before replacing half shafts and removing shims. My buddy got under and checked it and said it didn't appear anything was scraping the disc and all the bolts look tight. I hear zero noise when accelerating. Has anyone removed shims or replaced half shafts and had this issue? Thanks for the help.

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    3 Star General Dock Rocker's Avatar
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    Where did you get the shafts? The grinding is common with the Chinese knock off shafts.


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    Corporal johnhjohnson2's Avatar
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    I got them off ebay. It says manufacturer is MFPC with manufacturer part number 2520-01-383-2387. Says they are made in USA.


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    3 Star General Dock Rocker's Avatar
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    I am guessing they are not. Just do a little searching on eBay shafts. You will quickly find your answer.

    Kascar, hummer parts guy and adventure accessories would be a much better bet.


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    4 Star General ken's Avatar
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    I assume you are talking about the shims behind the top Arms trying to square the rear tires to the ground. Try reinstalling the shims. Removing them may have taken up any slack. This would make the shafts a little too long and make the joints bind. When you lift the truck to check rotation, the suspension will be farther down. This would make the geared hubs farther away from the diff. So it will spin freely.
    Kenny
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    4 Star General Retiredwarhorses's Avatar
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    This has come up numerous times on Chinese rear halfshafts.
    Retired War Horses Restoration

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    So many HMMWVís I lost count years ago....

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    Corporal johnhjohnson2's Avatar
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    I'm sure that is the issue. The two I replaced on the front are probably the same as I bought them off ebay but I haven't had issues from them when replaced. Again the listing states they are 10K U.S. made half shafts but I don't have way to verify that is the truth. The only time that I hear the grinding noise is when I brake. They are smooth when driving. Is that common with the rear half shafts?

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    Corporal johnhjohnson2's Avatar
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    Hey guys,

    I replaced both ebay bought rear half shafts with two american ones from hummerpartsguy. The grinding sound remains. It is loudest when I lightly press on brake. Again this sound wasn't there before I replaced rear half shafts and removed rear shims. Could removal of rear shims cause this issue?

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    Corporal johnhjohnson2's Avatar
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    IMG_2235 2.jpgIMG_2242.jpgIMG_2235 2.jpgIMG_2242.jpgIMG_2235 2.jpgIMG_2242.jpgThe left side had two extra shims and we removed them all. But seems to look symmetrical

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    4 Star General ken's Avatar
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    Reinstall the shims. Removing them moved the geared hubs closer to the diff. This removed the clearance. They are binding while braking and in reverse. I understand you do not hear anything while driving forward. That dose not mean there is enough clearance. This is also binding the bearings inside the diff. There is a good chance something will break when the suspension compresses while off road or loaded. Also inspect your A ARM bushings. Are they centered with the bolt that goes through them? Are they sagging and allowing the A ARMS to be closer to the center of the truck? Next inspect the diff and housing. Bearings in good shape? Anything broken or cracked?
    Kenny
    1966 M35A2C
    1986 M105
    1952 M37
    1966 M101
    1986 M1028A1
    1988 M101
    1993 M998
    MEP003
    MEP002

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