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Q: Steering and brake failure on 2002 Chevrolet Silverado 3500

The power steering and power brakes failed at the same time.
All fluids are full. The belt is in tact. No warning, just suddenly failed pulling out of driveway. What could have caused this. There are only 57,472 miles on vehicle.
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I'm assuming you have Hydroboost assist not vac assist. It could be a bad Hydroboost assembly. For more info contact me at
Correct, I have Hydroboost, not vac. Be advised, the steering & brakes are working again??? Nothing was touched...they just started to work properly on their own????
I had this problem, by the time the tow truck got there the steering and brakes started working again. I had the service people at my local Chevy dealer look at what could cause this and they replaced a valve in the power steering pump. 75,000 miles later and no problems.
Talked with mechanic. Pressure valve in steering pump is subject to stick for various reasons. Sudden change in weather, corosion, etc. Suggested adding Lucas Steering additive to steering pump for $10.00 before getting expensive repair. Added the fluid. Steering feels better than ever after about 100 miles. What can I say, so far so good.
Lucas is a good product. I used it on a leaking power steering box and it sealed it up till I sold the truck.
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