Power steering and brake trouble - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 31 (permalink) Old 08-21-2007, 09:09 AM Thread Starter
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Power steering and brake trouble

My power steering never works 100% when im trying to make turns at low speed(low rpm). Its almost like the power steering turns off. In addition to that the brakes feel mushy and i can feel some vibration in the pedal. The steering wheel also seems to have a little bit of play. Can anyone help me diagnose this problem
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post #2 of 31 (permalink) Old 08-21-2007, 11:41 PM
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Need more info of you truck.. Year make etc.

I know that my 6.5 has a power steering leak and the power steering runs the brake booster so when the fluid runs low it looses its brakes as well.

Id clean all the dirt and grime off, fill up the power steering pump and turn the wheel back and fourth like crazy till you see a leak.

2006 Silverado 2500HD LBZ CC SB
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post #3 of 31 (permalink) Old 08-23-2007, 05:39 AM Thread Starter
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Its a 2004.5 / 6.6 / Silverado 2500
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post #4 of 31 (permalink) Old 08-23-2007, 10:45 AM
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i would check the serpentine belt that was my problem it could be rubbing somewhere

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post #5 of 31 (permalink) Old 11-27-2007, 07:39 PM
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I have a similar problem and have had it since day ONE. No leaks. Serpentine belt is fine. 80K mile. 2005 3500, SRW, 4x4, crewcab. It always happens when at idle and maneuvering in parking lot. Increased effort to steer/brake. System will growl if I push it hard enough. Never stops working, just doesn't seem like there is enough hydraulic capacity.

2005 K3500 SRW 4x4 CC
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post #6 of 31 (permalink) Old 09-02-2008, 05:21 PM
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anyone have any additional information on the break booster pump. seems as though the power steering side just behind the master cylinder is exibiting some residual fluid, just wondering if it may be common. it leaves an aweful stain on the street and really want to consider getting it fixed. thanks for any help.i also have the 95 3500 drw 6.5 litre.

Last edited by feo2h3; 09-03-2008 at 08:26 AM. Reason: added vehicle information.
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post #7 of 31 (permalink) Old 06-15-2010, 07:42 PM
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Location: Harvest Alabama
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Ding, Ding: you have found one of the hidden problems. Chevy has a service bulletin on this issue. It does not have a repair option.

The hydraulic brakes system gets it power from the power steering pump. I beleive that when the brake is applied repetitive and multiple times the pump is unable to maintain power for the steering box, and can end up with loud noises and eventually the steer column locking up unless you allow power to transfer from the brakes to the power steering.

My condition starts when backing my boat down the driveway. Last I checked, the bulletin cover 1999 through 2004 (?2005) (trucks, sub, yukons, hummers, hd and non-hd). It is one of the reasons I do not have new truck
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post #8 of 31 (permalink) Old 06-16-2010, 01:15 AM
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There is night and day difference in mine since I flushed the PS system. I had no leaks though.

2006 Freightliner Century 120 with Detroit Diesel. Sold my 2012 Chevy 3500 dually work truck with CM ER hauler bed and EZ Floater air hitch. Towing 2003 Teton Grand Freedom 5ther weighing 20,890 lbs. Traveling the USA welding pipe, repairing plants, building new ones & really enjoying God's beautiful country.
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post #9 of 31 (permalink) Old 06-16-2010, 07:57 AM
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Maybe I should not have tried getting it fixed under warrenty.

The bulletin was locate during the warranty period. I have not had the dealer pull up new updates on the steering in a while. The dealer had attempted a few things before finding the bulletin: flush and replacing something ( i need to see if it was the valve in the pump.) After locating the bulletin, it issues a do not fix order. ...no repairs available.

Since it is out of warranty, may be the aftermarket industry has stepped up to the plate. Thanks for the insight.
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post #10 of 31 (permalink) Old 09-09-2011, 01:41 PM
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back again

After using the latest bulletin, the Lucas flush did not work. Seems to be getting worst. I hope to find an after market pump.
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