Question about 1999 Chevrolet C/K 2500

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Hydro boost Hi, Benimur, hope you can help, I have a 99 k2500 suburban with the hydro boost power brake system and When I apply the brakes abruptly the pedal goes to the floor or at least way down and then rather sluggishly the brakes apply and the pedal pushes back up as I am holding it down, I can't believe it is supposed to do that. I replaced the master cyl. but nothing changed. Brommel

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  • Anonymous Mar 15, 2014

    I have a 1985 4 wheel drive 3/4 ton Suburban with 454 engine no hydro boost. Power steering pump get hot and blows front seal. I have replace pump gear box hoses and it still blows front seal. If i drive 45 and under no problem above 45 and in a straight line it blows up. Please Help

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There was also a problem with the hydro boost - master cyl. union. It's been a year or so since I read it, but there was a TSB or recall covering up to 1998 as I recall. But it's still the same design in 1999.

Do you have signs of fluid leaking on that side under the master cyl. / boost? I just replaced mine last week, but I spent a year adding power steering fluid every 3-4 weeks, having soft brakes (though never as bad as what you describe) and leaving power fluid puddles everywhere I parked.

The prescribed solution is to replace the booster and master cyl. I figured I'd replace the PS pump while I was going through all that trouble, and it had a lot of sludge and filings on the magnet inside. I'd do the trifecta if I were you.

Posted on Jan 27, 2009

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Hi,

Appreciate the "Ask Me" and my compliments, scary driving one of those in our roads.

Might you have to check the Brake Booster. Normally, there would be a vacuum line to the booster from the intake manifold. Common design calls for a PCV type valve at the entrance to the booster. Pls check this. It also operates on the same principle and therefore checks the same, you can blow one way but not the other; would have a sliding ball inside that acts as the valve. In some instances, it could be the diaphragm inside that might have a tear.

Of course, the Proportioning valve system must likewise be checked. I have heard a lot of brake problems with K2500 especially the rear drum.

Incidentally, there was a recall order of some sort. TSB 99-05-24-001A SEP 99 which addressed brake pull/wear, the recall involved replacing the proportioning valve.

  • The Technical Service Bulletin referenced previously discusses the issue surrounding the proportioning valve. Also, there's a corrosion issue which has resulted in the recall of the trucks in certain states.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 10, 2008

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2001 chevy tahoe vacum hoeses for power steering


Hello! There are power steering fluid in/out hoses but no vacuum lines...It sounds as if the pump needs to be bled of air or the belt is loose...Belt should move about 1/2 to 3/4"...Bleeding is as follows...
Guru...saailer

    ImportantPower 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.
  2. ImportantWith 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.
  3. If equipped with hydro-boost, fully charge the hydro-boost accumulator using the following procedure:
  4. 2.1. Start the engine.2.2. Firmly apply the brake pedal 10-15 times.2.3. Turn the engine OFF.
  5. Raise the vehicle until the front wheels are off the ground. Refer to Lifting and Jacking the Vehicle in General Information.
  6. Key on engine OFF, turn the steering wheel from stop to stop 12 times.
  7. Vehicles equipped with hydro-boost systems or longer length power steering hoses may require turns up to 15 to 20 stop to stops.
  8. Verify power steering fluid level per operating specification. Refer to Checking and Adding Power Steering Fluid .
  9. Start the engine. Rotate steering wheel from left to right. Check for sign of cavitation or fluid aeration (pump noise/whining).
  10. Verify the fluid level. Repeat the bleed procedure if necessary.

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RECALL: 2003-2004 Hummer H2 NHTSA Campaign Number: 04V045000

www.nhtsa.dot.gov
Manufacturer GENERAL MOTORS CORP. Recall Date: 02/04/2004 Potential Number Of Units Affected: 68,875 Description SERVICE BRAKES, HYDRAULIC Summary CERTAIN SPORT UTILITY VEHICLES, PICKUP TRUCKS, AND PASSENGER VANS FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 135, ?PASSENGER CAR BRAKE SYSTEMS.? SOME OF THESE VEHICLES WERE PRODUCED WITH AN OUT-OF-SPECIFICATION BRAKE HYDRO-BOOST HOUSING RELIEF VALVE BORE. Consequence CONSEQUENTLY, THE VALVE O-RING SEAL MAY FRACTURE. STEERING EFFORTS MAY BE SLIGHTLY INCREASED WHILE BRAKING OR PARKING. UNDER CERTAIN DRIVING CONDITIONS, A FRACTURED SEAL MAY REQUIRE A SLIGHT INCREASE IN THE APPLIED BRAKE PEDAL EFFORT TO ACHIEVE THE SAME VEHICLE DECELERATION RATE AS PRIOR TO THE SEAT FRACTURE. Remedy DEALERS ARE TO REPLACE THE HYDRO-BOOST RELIEF VALVE. THE RECALL BEGAN ON APRIL 26, 2004. OWNERS SHOULD CONTACT CADILLAC AT 1-866-982-2339; CHEVROLET AT 1-800-630-2438; GMC AT 1-866-996-9463; OR HUMMER AT 1-866-486-6376.

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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.

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