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It's really quite easy, although you will need a means of either lifting or jacking up the chassis when you install the new one.

Disconnect the air lines going to the air bag. Unbolt the air bag from the top and bottom... the top is usually two small bolts, and it'll be a larger bolt on the bottom. Off the top of my head, I don't remember exactly what size they are.

The old air bag will pull right out at this point.

Clean off the air fitting threads with a wire brush.

Install the new air bag... before reattaching the air fittings, make sure you put some thread tape or liquid thread sealer on them. To install the new air bag, you'll have to either jack up the chassis or lift it up... at work, I use an overhead crane for this.

Reinstall the bolts. The smaller top bolts should be torqued to 20 - 25 ft./lbs. and the larger bolt on the bottom should be torqued to around 50 ft./lbs.

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Q: How do you changeair bag on peterbilt 379 sleeper?
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