dealer answer to no brakes or steering backing up

Same problem again took it to a different dealer:

Got the following printout from dealer Document ID# 1470932 Lack of steering assist When stopped or during parking lot type maneuvers-kw brake power assist oil no hard noise booster hydraulic slow low speed bind weak #PI01863-(Mar 11,2004)

Some customers may comment on lack of steering assist when stopped or during parking lot type maneuvers If vehicle passes power steering test this may be normal condition A phenomenon exists when a customer uses the brake and tries to steer the vehicle when stopped or during parking lot type maneuvers. The design of hydroboost system does not allow for steering assist under these conditions. No repairs should be attempted and any customer situations should be referred to Area Vehicle Manager

Models 03-04 Silverado Avalanche Tahoe, Suburban GMC sierra Sierra Denali Yukon Yukon xl Cadillac Escalade EXT ESV Chevrolet Express GMC savanna Hummer H2

The one common item between the brakes and the power steering is the power > steering pump. It provides hydraulic pressure to both the power steering > and the hydraulic booster for the brakes. Lack of pressure in the PS pump > could cause both the steering to become almost too stiff to turn and the > brakes almost too hard to press. I can't tell you why the problem changes > when you start it in neutral - there is no real connection between the > brakes, steering and tranny. > > First, check your power steering fluid and top it off as needed. Little > or > no fluid or air in the lines could cause this problem. If the issue > persists, have someone remove the accessory drive belt and check the > pulley > on the PS pump. It could be loose and slipping on the shaft. If it spins > on the shaft, the pump won't turn and you would have this problem. It > could > also be a problem internal to the pump, at which point it will need to be > replaced. > > If nothing appears to be wrong with the PS pump, it could be the bypass > valve. This valve keeps fluid flowing from the pump discharge back to the > intake even if you aren't using anything connected to it. The variable > positions of this valve make the power steering easier or harder depending > on how much fluid it allows to bypass. If it is stuck in a wide-open > position at start-up it could cause this problem. > > Good luck and let us know if you find out anything - Jonathan > > -- > Jonathan A. Race > Lieutenant, EMS Supervisor > Orange County (FL) Fire Rescue Department > > (This message may contain personal opinions and/or information not related > to my employment or employer) >> I have a 2003 Silverado 2500hd diesel with Allison trans. Long bed crew > cab. >> Truck has32,ooo miles with no other problems other than scheduled oil >> changes and trans fluid and filter at 30,000miles >> >> Two weeks ago I went out to start it on Monday morning after it sat still >> from Friday afternoon. When I started it with trans in Park and put it >> in >> reverse to back out of the driveway the steering froze and the brakes >> were >> impossible to press down. It felt like the hydraulics were gone on both. > A >> tow truck came and the driver finally manhandled it straight enough to be >> towed to the dealer. At the dealer that afternoon the mechanic started >> it >> and everything worked fine so they told me to come get it. This weekend > the >> same thing-it sat still from Friday started on Monday morning and brakes > and >> power steering wouldn't work. I turned it off and tried again -no luck. >> Then I had an idea. I put it in neutral and started it-everything worked > OK. >> I took it back to Chevy dealer and told them what happened. When I > returned >> the next day they said they couldn't find anything wrong and couldn't fix > it >> if nothing was wrong. Does anyone have any Idea of what's going > on?--Debbie >> >> >> --- >> Outgoing mail is certified Virus Free. >> Checked by AVG anti-virus system
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