why is truck making a whining type sound that stops when the gas is applied

1991 CHEVROLET CHEYENNE
180,000 MILES
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JACKHODGE
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The sounds also changes slightly when I turn the wheel. It may be unrelated but it also makes similar sounds while in reverse.
Sep 26, 2012 at 12:38 AM
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HMAC300
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it might be a powersteering pump. have a pro look at it they normally don't charge for an opinion.
Sep 26, 2012 at 12:39 AM
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JACKHODGE
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Thank you for such a quick reply. What problems could I face if the power steering fails completely?
Sep 26, 2012 at 12:45 AM
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HMAC300
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will be hard to turn at slowspeeds and parking.
Sep 26, 2012 at 12:47 AM
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JACKHODGE
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I've heard that it could effect my braking power or cause brake failure. Is that true?
Sep 26, 2012 at 12:50 AM
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HMAC300
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it wold only do that if you had a hydraulic unit for a braek booster and i don't think in 91 that was done yet. If you have a hydraulic instead of vacuum brake booster then it would if hte pump failed.
Sep 26, 2012 at 2:16 PM