This is a serious problem folks. The defect happened to me on 1/31/04 and impacts Chevy trucks. Mine was a Silverado 2500, but if the power steering pump goes it leads to no brakes and no steering. Very dangerous situation. The NHTSA is doing a full blown investigation on this defect. See below:

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NHTSA Action Number : PE04004 NHTSA Recall Campaign Number : N/A
Make : CHEVROLET Model: C2500
Manufacturer : GENERAL MOTORS CORP. Year : 2000
Component : SERVICE BRAKES, HYDRAULIC
Date Investigation Opened : January 8, 2004
Date Investigation Closed : Open

Summary:
NHTSA HAS RECEIVED 19 REPORTS FROM OWNERS OF GENERAL MOTORS 2500/3500 SERIES PICKUP TRUCKS ALLEGING A LOSS OF POWER BRAKE AND/OR POWER STEERING. THESE REPORTS CLAIM FRACTURING OF THE HYDRAULIC PUMP SHAFT IS THE CAUSE FOR THE POWER ASSIST LOSS. LOSS OF POWER BRAKE AND/OR POWER STEERING WILL INCREASE THE BRAKE PEDAL FORCE AND/OR STEERING EFFORT NECESSARY TO CONTROL THE VEHICLE. GM HAS USED SEVERAL DIFFERENT HYDRAULIC PUMPS FOR EACH MODEL YEAR. ODI WILL CONDUCT AN INVESTIGATION TO DETERMINE WHICH HYDRAULIC PUMPS ARE FAILING BY VEHICLE MODEL AND MODEL YEAR AND THE CONSEQUENCE ON VEHICLE CONTROL.