Question about GMC Sierra 3500HD

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Brakes and power steering

Power steering is out and power brakes are out.

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Check to see if the belt is still turning the p/s pump. I'm betting it is but it won't hurt. Check to see if the power steering fluid is full. If it is empty than you need to figure out where it is leaking. Could be the pump, hoses, steering gear/rack and pinion, or the hydro booster. If it is not emptythan remove the belt and pull out of the power steering pump pulley. If it pulls out of the pump replace the pump. Pretty common with newer gm vehicles. Make sure you post a Year, make, model, and engine size? This always makes it easier to help you out!

Posted on Feb 26, 2012

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Lingo is o.k., but I think you may be confusing power steering with power brakes. Power steering has no master cylinder (brakes do) and no power booster (brakes do). The power steering pump is mounted on the front of engine and run by the fan belt or the serpentine belt. The p/s hoses are 2- a pressure line and a return line, and run from the pump to the steering box or to the rack and pinion steering gear.
It just sounds like you have a brake fluid leak at the master cylinder. If it is, you need a new or rebuilt brake master cylinder.
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Power steering and brakes dont work are they connected somehow and how would i fix this problem


Hello cindygariepy: My name is Roger and I will help you. Yes they are connected. The truck uses a brake system called Hydra-Boost. There is no vacuum booster like the cars use. Hydro-boost brakes use the power steering system as a source of power assist for the brakes. You need to check to make sure the fan belt is still on the engine. Should the belt brake you will loose power steering and brakes. Next check to make sure the power steering has fluid. If you have a leak in the power steering system and the system is extremely low you will loose steering and brakes. Generally when the system is low you hear a noisy growl when turning the steering wheel. These are the usual problems that occur when you loose both the power steering and brakes at the same time. There is one other part that could cause the condition . That would be a hydro-boost failure. If it fails there would be a lot of fluid leaking at the driver side of the vehicle in front of the driver seat outside on the ground. Power steering fluid is a clear oil. Should you need further help please just ask. Thank You for using Fix Ya. Roger

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1 Answer

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Your van don't have the regular air (vacum) power brake booster, your has a hydraboost brake booster, which is power by your power steering pump, if power steering pump goes bad you will not have power steering or brakes, brake peddle will feel very hard and will take alot of pressure on the brake peddle to stop your van, more the likely your power steering pump is bad.

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YOUR VECHICLE HAS THE HYDRALIC BOOSTER.WHICH YOU POWER STEERING PUMP CONTROL BRAKING SYSTEM.CHECK POWER STEERING PUMP FLIUD LEVEL.IF LOW CHECK POWER STEERING PUMP HOSES FOR LEAKS.IF YOU FIND NO LEAKS.THE HYDRALIC BOOSTER OR POWER STEERING PUMP FAULTY.

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2002 Chevy silverado 2500HD No power steering or brakes


The shaft in your power steering pump has broken. Your brakes work off of a system known as Hydra-Boost. If this shaft is broken then your steering and brakes are lost. I contacted GM after I had my power steering pump replaced and they sent me a check for the cost of my repairs. My truck was not under warranty or recalled but earlier models (2500HD) had been recalled for the power steering pump shaft. The pump was the same part number for my 2002 2500HD as the recalled years. Good Luck!

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1 Answer

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check power steering fluid. first. if all good . power steering is going. your hydro boost brake system depends on the power steering pump if it goes out your brake go out.

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I'd say you broke a serpintine belt if you lost them both at the same time. Check your belts and see if you're missing one... You should have breaks and steering, just manual... hard to steer and brake...

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3 Answers

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Sounds to me like your power steering pump has gone bad. Being a vehicle with a hydro-boost brake system that would explain the power brake failure. Hydro-boost brake systems utilize pressurized power steering fluid to provide brake assist. In most lighter GVWR vehicles this function is performed by engine vacuum. There is a recall on certain Silverados and Sierras that addresses a faulty check ball in the booster, but your vehicle is affected by a steering issue as well. This would indicate to me that it is the pump. You can however check online to verify if your vehicle is affected by the recall. Hope this helps.

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