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Just wondering if you found the fix? My '99 Sub 1500 4WD is having the exact same symptom that you describe. I suspect it's the booster but nothing looks wrong externally. I'm a mechanic but I hate to go fishing on this one, that booster looks like a pain to replace.
 

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Thanks for the quick reply!

I'd already resigned myself to squeezing in under the dash to replace the booster, your answer gives me hope I won't be wasting my time and getting cramped up for nothing.

Plus I was getting a little concerned about having to e-brake that big thing if necessary. Not exactly a lightweight.

Appreciate it.
 

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Job done, booster fixed it.

Worst part was getting the small retainer clip off the brake pedal post. Complicated little clip and you can hardly see it much less get to it.

Bought a new clip so I could see how to release it. Still a major pain but finally got it to pop off.

Thanks again for the info
 
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