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Dan, Auto Technician
Category: Chevy
Satisfied Customers: 3490
Experience:  GM Mark of Excellence/ Service Guild Participant with 13 years experience, ASE Master Certified
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2007 silverado 3500: boost..The brakes and steering..intermittently

Resolved Question:

I own a 2007 silverado 3500 I am noticing a leak on the driver side front shock area at the top, I also noticed a brake fluid leak at the hydro boost area. The brakes and steering are now intermittently acting up. Is there a recall on the hydro boost? Thanks
Submitted: 8 years ago.
Category: Chevy
Expert:  Dan replied 8 years ago.

There are no recalls or special policies for the steering or brakes pertaining to your concerns. I did find this bulletin for a similar concern. Also, if the hydroboost or hydraulic portion is leaking replace under warranty. Make sure it's not a leaking shock at the same time. I have seen the hydroboost units leak on these trucks.

#05-02-32-008B: EI06002 - 670 Gear Box Power Steering Pump, P/S Performance Concerns - (Jul 18, 2007)

Subject:EI06002 - 670 Gear Box Power Steering Pump, P/S Performance Concerns

Models:2003-2006 Cadillac Escalade, Escalade ESV, Escalade EXT
2003-2006 Chevrolet Avalanche, Suburban, Tahoe
2003-2007 Chevrolet Silverado Classic
2007-2008 Chevrolet Silverado, Suburban (2500 Series Only)
2003-2006 GMC Yukon, Yukon Denali, Yukon XL
2003-2007 GMC Sierra Classic
2007-2008 GMC Sierra, Yukon XL (2500 Series Only)


This bulletin is being revised to add model years and models. Please discard Corporate Bulletin Number 05-02-32-008A (Section 02 -- Steering).


Some customers may comment on a lack of steering assist when stopped or during parking lot type maneuvers. A lack of steering assist could occur if the brakes are applied and turning the steering wheel with the vehicle stopped or during parking lot type maneuvers. This condition will go away or greatly improve once vehicle begins to move or is above parking lot speeds. This concern can be aggravated by worn tires, low tire air pressure, low power steering pump pressures, and tires larger than stock size.


Important: In all cases, it is recommended that the proper tire size and the maximum tire pressure is set according to the manufacturer's specification as noted on the door placard; especially for the front tires.

  1. Perform the "Power Steering System Test" found in SI. Make any necessary repairs based on system diagnosis.
    1.1. FOR 2500 AND 3500 VEHICLES ONLY - If diagnostics did not lead to any repair, this concern is a normal operating characteristic. No further repairs should be made. A Field Product Report should be submitted - refer to Corporate Bulletin Number 02-00-89-002D.
    1.2. FOR 1500 SERIES VEHICLES ONLY - If diagnostics did not lead to any repair, this concern is a normal operating characteristic.
  2. If the vehicle is equipped with a 670 gear box, replacing it with a 680 gear box may increase the customer satisfaction.
  3. To determine if the vehicle is equipped with a 670 gear box, inspect the mounting bolts that attach the stub shaft housing. A 670 gear box will only have 3 mounting bolts. If the stub shaft housing does not have any mounting bolts or has 4 bolts - DO NOT PROCEED WITH THIS BULLETIN. The vehicle is not equipped with a 670 gear box.
  4. If replacing a 670 gear box with a 680 gear box, it will be necessary to replace the power steering gear, union fitting and both inlet O-ring seals.

Parts Information

Part Number



Power Steering Gear


Union Fitting


Inlet O-ring Seal

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