Reposting what I put on another threat on this forum last weekend.
@lcp : as Harry said, you might have pumped grease into your brakes.
Information on rear axle bearing grease fittings from a Jeep forum.
For all of us who have wondered why there is an open vent hole (instead of a valve) above the rear axle grease fitting, enjoy reading below.
Interesting to know the background / history of the rear axle grease fittings. (M38 and M38A1 were the military Jeeps from about 1951).
I'm servicing my M38A1 and found the zirk fitting (and apparently a vent) busted off. There is 0 information in the old Army field manual on the zirk and vent. Probably because bearings were over greased at PMCS (preventive maintenance, checks, and service). Searching the web, I found this:
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There are only two, one on each side pointed toward the rear. The upper fittings you see are Vents. On the M-38/M-38A1 they are calibrated to release at a certain pressure loaded, you will note a little cap on top that you can raise with your thumbnails.
The Army noticed a problem of drivers or mechanics over greasing the rear wheel bearings resulting in failed outer seals and greasy brake shoes. The cure was to immediately order the grease fittings removed and a plug installed until the next grease interval indicated in the LO. Best way to lube the rear bearings is slowly and sparingly with a hand operated gun. Pump slowly until the spring loaded valve starts to rise and stop. Some grease may appear, do not add any more.
The LO is confusing as to how to lube this area, it indicates removal and hand packing, that is an error, the grease fittings are for that purpose. Those CJ2A-CJ-5 owners will notice(Correction) a grease fitting also, there is no pressure relief valve on the CJ, just a small hole at the top, slowly pump grease in by hand until it just shows at the hole on top.
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