I noticed a couple of complaints about brake shudder up hill. I found this on:
http://www.wkjeeps.com/recalls/wk_recall.htm
2006 - 2007 (WK) Jeep® Grand Cherokee
(XK) Jeep® Commander
NOTE: This recall applies only to the above vehicles equipped with a model 245 two speed transfer case (sales code DHX).
The software programmed into the Electronic Brake Control (EBC) module on about 296,000 of the above vehicles may allow a momentary delay in braking when coasting up a hill during certain conditions. This could increase the vehicle’s stopping distance and cause a crash without warning.
Repair
The EBC module must be reprogrammed (flashed).
Cheers…….. Kenjo