I had this TSB done on my truck last week. I took some hassle, but it ultimately was worth it. I took mine in and complained of inadequate braking. I also mentioned that I had heard there was a TSB. They verified my concern and ordered the new booster. The new booster is quite a bit bigger than the other. The brakes now work much better...At first, I was stopping short at lights, etc. by 15 or so feet. The only downside to this is the new booster is a little noisy. When you step on the brakes, there is a little noise similiar to a squeaky toy for a dog. I asked the dealer about this and they said it was just the way the new booster worked.

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1998 F-150 XLT SC 5.4L

 

Bigger how? Diameter, or thickness?