gmc truck

2004 GMC SIERRA
4WD
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EXPRESSDEMO
  • MEMBER
  • 3 POSTS
i lost my power steering and power brakes on my 2004 gmc seira 2500 4 wheel drive could it be my power steering pump
Dec 21, 2010 at 7:30 PM
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RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 75,992 POSTS
Check the power steering pump level and the hydro boost unit-
Dec 21, 2010 at 7:47 PM
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EXPRESSDEMO
  • MEMBER
  • 3 POSTS
Fluids are up and how do you check the hydro boost unit or the pump? TY
Dec 21, 2010 at 8:02 PM
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RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 75,992 POSTS
Checking the Hydro-Boost system is to pump the brakes five or six times with the engine off like checking the power brake booster to discharge the accumulator. Then press down hard on the brake pedal (about 40 lbs. of force) and start the engine. Like a vacuum booster, you should feel the pedal fall slightly when the engine starts, then rise.
Dec 21, 2010 at 8:11 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.