Mechanics

TRUCK

2004 GMC Sierra • 4WD •

I lost my power steering and power brakes on my 2004 gmc seira 2500 4 wheel drive could it be my power steering pump
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Expressdemo
December 21, 2010.



Check the power steering pump level and the hydro boost unit-

Rasmataz
Dec 21, 2010.
Fluids are up and how do you check the hydro boost unit or the pump? TY

Tiny
Expressdemo
Dec 21, 2010.
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.

Rasmataz
Dec 21, 2010.