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Loss of power steering when brakes applied- this is 2005 year not 2006 with turbo boost. Recent failure power steering pump- no assist after pwr pump replaced assist came back bleed system by turn wheels lock to lock 10 times and adding fluid until reservoir to full mark- thought I was done- then wife took it to town, came back said everytime brakes applied steering gets very stiff. I can not see any tie in between brakes and power steering, hoses go directly to steering box. Again 2005 Buick Rainier V8 CXL production date- 11/04 VIN# 5GAET13M752210397 Model- T15506 Type- MPV

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6ya6ya
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Posted on Jan 02, 2017

capsman
  • 111 Answers

SOURCE: Power Steering pump appears to be leaking but is full????

Just guessing. Could it be a warped brake disk? That would cause vibration. And vibration in steering might conceivably cause splashing out the power steering reservoir. You would know if the disk were warped by a shudder when you brake at hight speeds.

Posted on Jun 19, 2008

  • 2039 Answers

SOURCE: Power Steering pump replacement

if you have power stering oil in it its normal for the pump to be noisy its air that make that noise continue to drive air will come out by itself after a few kilometer it will go away if you have enough oil thanks pierre

Posted on Aug 10, 2008

motor1258
  • 6674 Answers

SOURCE: back brake lines wont bleed on 77 chevy truck

Check out this link & read about combination valve & how to center it when bleeding.

http://www.autozone.com/addVehicleId,1321403/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c1528007a632

Posted on Jan 23, 2009

shop242
  • 214 Answers

SOURCE: Power Steering Leak - 2001 Passat Wagon 1.8T

Use ATF fluid.. as long as its full.. it'll be OK..

Posted on Mar 10, 2009

  • 382 Answers

SOURCE: 03 Buick Rendezvous Overheating

If the top hose is hot and the bottom is cold, your definitely not getting circulation. You,ve already done alot of work to this vehicle so you have pretty much answered your own question. About the only thing left is the heater core. Of course, I dont want to be the one to tell you it is definitely the heater core because obviously I am not looking at the vehicle. But If i was a betting man, thats where my money would be.

Posted on Dec 14, 2009

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1 Answer

.renault grand scenic 06 1.5 dci brake pedal pushes to floor also turbo inop


id check the aux drive belt sounds as if the vac pump belt or pump itself has gone bad , the waste gate from turbo is vac activated (no power) , and the brakes are vac boosted , so that leads me to believe you have a loss of vac some how

Feb 10, 2015 | Renault Cars & Trucks

1 Answer

2001 Silverado 2500 HD Why Rear brakes don't work after I installed new hydro-boost power booster, master cylinder, calipers, and pads. I bled master cylinder before installing, and brakes beginn


Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

Jul 23, 2017 | 2001 Chevrolet Silverado 2500HD

2 Answers

What causes the brakes and power steering to go out at the same time?


Are you a diesel? If you are do the recall ,for the hydro boost (brakes) you sound like it.There is a recall on the hydro boost and yes this is a power steering assist, and a brake power assist
Recall I.D # 04045000

May 02, 2011 | 2004 GMC Sierra 2500

1 Answer

My brakes and power-steering are not working. The brake pedal is hard, but the brakes will not engage. The power steering was not working at the same time. It has brake fluid, but when I took the power...


Yes, your brakes are boosted by the power steering pump rather than by vacuum. I don't think it's air in the system. More likely your pump has failed, but you can try bleeding the pump. Here is a procedure from autozone.com:

Observe the following:
Use clean, new power steering fluid type only Hoses touching the frame, body or engine may cause system noise. Verify that the hoses do not touch any other part of the vehicle. Loose connections may not leak, but could allow air into the steering system. Verify that all hose connections are tight.


NOTE Power steering fluid level must be maintained throughout bleed procedure.

  1. Fill pump reservoir with fluid to minimum system level, FULL COLD level, or middle of hash mark on cap stick fluid level indicator.
    NOTE With hydro-boost only, the oil level will appear falsely high if the hydro-boost accumulator is not fully charged. Do not apply the brake pedal with the engine OFF . This will discharge the hydro-boost accumulator.
  2. If equipped with hydro-boost, fully charge the hydro-boost accumulator using the following procedure:
    1. Start the engine.
    2. Firmly apply the brake pedal 10-15 times.
    3. Turn the engine OFF

  3. Raise the vehicle until the front wheels are off the ground.
  4. With key in the ON position and the engine OFF , turn the steering wheel from stop to stop 12 times. Vehicles equipped with hydro-boost systems or longer length power steering hoses may require turns up to 15 to 20 stop to stops.
  5. Verify power steering fluid level per operating specification.
  6. Start the engine. Rotate steering wheel from left to right. Check for sign of cavitation or fluid aeration (pump noise/whining).
  7. Verify the fluid level. Repeat the bleed procedure if necessary.

Observe the following:



Use clean, new power steering fluid type only Hoses touching the frame, body or engine may cause system noise. Verify that the hoses do not touch any other part of the vehicle. Loose connections may not leak, but could allow air into the steering system. Verify that all hose connections are tight.
NOTE Power steering fluid level must be maintained throughout bleed procedure.
  1. Fill pump reservoir with fluid to minimum system level, FULL COLD level, or middle of hash mark on cap stick fluid level indicator.
    NOTE With hydro-boost only, the oil level will appear falsely high if the hydro-boost accumulator is not fully charged. Do not apply the brake pedal with the engine OFF . This will discharge the hydro-boost accumulator.
  2. If equipped with hydro-boost, fully charge the hydro-boost accumulator using the following procedure:
    1. Start the engine.
    2. Firmly apply the brake pedal 10-15 times.
    3. Turn the engine OFF

  3. Raise the vehicle until the front wheels are off the ground.
  4. With key in the ON position and the engine OFF , turn the steering wheel from stop to stop 12 times. Vehicles equipped with hydro-boost systems or longer length power steering hoses may require turns up to 15 to 20 stop to stops.
  5. Verify power steering fluid level per operating specification.
  6. Start the engine. Rotate steering wheel from left to right. Check for sign of cavitation or fluid aeration (pump noise/whining).
  7. Verify the fluid level. Repeat the bleed procedure if necessary.

Oct 24, 2010 | 2005 Chevrolet Silverado

1 Answer

Have 2 Hummers ( both 1995) that have a Hydrualic 'boost' loss to steering when brakes applied. Steering power increases if I flip the throttle which allows me to turn the wheel when throttle is hit....


at the back of the pump where the high pressure line attaches. I'm not saying thats your problem, but thats where the valve is. I think if you disconnect it, it should have full boost.

Aug 31, 2010 | Hummer H1 Cars & Trucks

1 Answer

Press on brake and stering locks up


Steering locking up is not normal. You have a hydro-boost assist power steering system on your vehicle. It uses the power steering pump to apply hydraullic pressure to assist in braking. The hydro-boost system may have a problem, pressure or restriction problem. Have dealer check booster and current updates to check valves, there may be a service bulletin for your concern.
Hope this helps.

Mar 02, 2010 | 2007 Chevrolet Silverado 2500HD

1 Answer

Loss of brakes and steering


sounds like you've got a bad power steering pump. i'm not familiar with your vehicle, but some brake boosters run off vacume from the engine and others run off the power steering pump and it's called hydro boost. if you have the hydro boost type, this is most likely your issue.

Feb 09, 2010 | 2001 Chevrolet Silverado 2500HD

2 Answers

Power steering went out along w/brakes


Does it have a hydroboost brake booster? Is the belt still on the p/s pump? Have you checked the power steering fluid level? If yes and good to all, replace the Power steering Pump.

Mar 26, 2009 | 2005 Hummer H2

3 Answers

Power steering & power brakes


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.

Nov 04, 2008 | 2002 Chevrolet Silverado

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