Question about Hummer Cars & Trucks

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Steering/brake chatter when i stop fast for a yellow light, after that i get pulsating in the brakes and steering, baking up and going forward even if i am at a stop with brake pedal on and tunring wheel from left to right, did brakes 2 years a go they look really good.sorta feels like the brake pedal wants to come back when i press it in and the wheel wants to turn the opposite way that i want to turn it,could this be a power steeting pump or a hydro boost? dont want to spend money guessing. like to at least have a H1,s guys opion not a mechanic who is guessing on a humvi thank u paul

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  • 12 Answers

What you describe could be warped brake rotors or bad wheel bearings. Doesn't sound like the power steering pump.

Posted on Jan 08, 2013

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6ya6ya
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Posted on Jan 02, 2017

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  • 27 Answers

SOURCE: 2001 F-250 4x4 super duty steering problem

sounds like the problem is in the valving in the steering box. You may have to get a new steering box. i would get it checked.

Posted on Jun 29, 2008

Benimur
  • 6966 Answers

SOURCE: hydro boost

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

carsandcomps
  • 722 Answers

SOURCE: 2000 FORD EXCURSION POWER STEERING

How does the hydro boost fell "funny" - does the brake pedal go to the floor? Do the brakes lock up? engage immediatly? Does the brake light stay on, come on while brakes are applied? Have a diagnostics test done on it at a local auto parts store (usually a free service; stores may vary) and see if any codes show up. If so, the person submitting the test can tell you what the code(s) mean, and what to do to fix the problem.

Posted on Mar 31, 2009

yotaguy
  • 232 Answers

SOURCE: pulsation in brake pedal and rear end hops during braking

What happens is if you have a bad front wheel bearing when you brake that wheel will turn in or out,when this happens it throws the four wheel alignment out and since this is a solid rear axle,it's forcing it to flex on the suspension,wich could cause the rear tires to bite on the outside edge of one tire and the inside edge of the other,thats one possible the other would be that the rear brakes are are not slowing the wheels evenly causing the same issue.I saw this problem with a bad front wheel bearing on a Nissan Pathfinder but not as pronouced due to the independent rear suspension. Check the front wheel bearings,which of course will mean getting the calipers off the rotors,and then check for any movement in the rotor,if there is check the hub nut,if it's loose tighten it and check for play in the rotor if there is still play that's going to be caused by a bad bearing.You can check the braking in the rear with a simple spring scale(like the ones used for fishing),with the wheels removed have someone apply enough pedal pressure to just engage the brakes but still allow movement attach the scale hook to a wheel stud and pull until it starts to move and note how many pounds of pressure it takes to move the hub.If it's uneven chech your adjusters and even them if needed and then retest,if still uneven you'll need to bleed them again.As far as the dark black substance in the fluid I would say you may gotten a contaminent in the fluid.Brake fluid gets kind of a rusty reddish residue when it breaks down.If I missed anything or you need clarification don't hesitate to ask I'm home all day.Hope this helps solve your problem.

Posted on May 05, 2009

  • 4 Answers

SOURCE: 99 Chevy Tahoe... Rear turn signals, brake lights, and hazards

I had this problem, and to be honest, it happened to the left side about a week later...it's the board that the bulbs plug into...it's a very common problem with this model. So popular that you can normally get the socket board off the shelf at a parts store! it's extremely simple to replace, and I replaced all the bulbs at the same time!

Posted on Oct 11, 2009

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pulsating brake pedal indicates that the ABS is active under brakes whether it is required or not
from the rest I would first have a fault scan done to find any faulty sensors
Try replacing the ECM with a known good unit as the scan fault readings may reveal a problem ECM

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Sounds like bad brake pulsation, meaning warped rotors. When rotors are warped , they push the caliper piston in and out ,causing the brake pedal to pulsate and shake the steering wheel. I would start with replacing the front pads and rotors, and if you have drum brakes in the rear, have those cleaned and adjusted for a more balanced braking system.

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Reset abs light pajero


When the ABS comes into play from heavy braking you will feel a pulsating of the brake pedal under your foot. This is the brake pressure, on off on off as the wheels stop start stop etc. The ABS will not control the vehicle direction but by allowing the wheels to turn under brakes and not lock up you have control of the steering and the direction the vehicle goes.The ABS will not stop you quicker and in fact on ice or loose surface the distance to stop will be increased. As I said all the ABS does is give you steering ability under brakes.. Take the vehicle to an accredited brake shop and have the ABS tested if you feel that it is no operating properly

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I have 1999 Blazer with brake light out on driver side only. All other lights work. Replaced bulbs but nothing changed. Swapped the working lights from the other (right side) with the driver side but...


THE BRAKE LIGHTS DO GO THROUGH THE TURN SIGNAL SWITCH. TO TEST, REMOVE THE PLASTIC COVER AROUND THE THE COLUMN, UNDER THE STEERING WHEEL. THE TURN SIGNAL SWITCH MUST BE IN THE OFF POSITION. YOU WILL NEED TO EXPOSE THE WIRES UNDER THE STEERING WHEEL. DO NOT DISTURB THE WIRES IN THE YELLOW JACKET. THEY ARE AIRBAG WIRES. YELLOW PLUGS YELLOW JACKETED WIRES ARE AIRBAG.THE WIRE IN QUESTION HERE IS YELLOW BUT IT IS NOT IN A YELLOW JACKET, [ SLEEVE ]. NOW, PUSH ON THE BRAKE PEDAL. THE YELLOW WIRE IS LEFT REAR TURN & BRAKE WIRE, DARK GREEN IS RIGHT REAR TURN & BRAKE WIRE. BRAKE PEDAL DEPRESSED, IF BOTH OF THOSE WIRES HAVE POWER, ALL OF THAT IS OK. IF THE YELLOW WIRE HAS NO POWER TURN SIGNAL SWITCH IS BAD

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When braking on my '04 Suburban, it pulsates like it has a warped brake rotor, but rotors are true (all four), and there is no correlating pulsation in the brake pedal, nor in the steering. Also, this...


Try pulling the fuse for the anti-lock braking system. If the problem goes away with the ABS disabled, check the wheel rotation sensors for problems, especially cracked or broken mounts or wiring issues. I'm thinking a sensor is dropping out when it gets heated by the brake and feeding bad data to the controller. The controller than treats it as a low traction situation and starts pulsing the brakes. If this is the case, you would see an ABS or Low Traction warning light on your dash.

Another possibility is a worn or loose suspension component oscillating under braking stress. In particular, check the shock absorber mounts. You could also have a pad that chatters instead of gripping the rotor cleanly - this may leave marks on the rotor, and would probably produce an audible noise.

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I have a 2004 montana and the brakes feel like they are not working (pulsating) from time to time. The Van stops OK, the best way to describe it is like squeezing and releasing a water hose as water is...


The "pulsating" you refer to is Normal for a vehicle with ABS (Anti-Lock Brake Systems). It keeps the vehicle braking in a straight line and monitors each wheel with a sensor as to how fast it's turning while braking. The "pulsations" you feel is the ABS Computer turning each individual brake on and off to prevent a lock-up or skid. Perhaps if you road test the vehicle and apply your brakes lightly as in coming up on a stop sign in a residential neighborhood, you'll feel what you consider to be, "normal braking." Pulsations usually come at higher speeds and as to how much pressure you're putting on the brake pedal. You're safer than most now knowing that braking, even in snow, rain or gravel, that your vehicle will stop in a straight line instead of sliding to one side or the other.

If unhappy with ABS Braking, you can always remove the fuse to the ABS computer rendering it inoperative, so you have both choices as to what you'd like to do, right here.

I hope this helps,

~00 Buck~

"Still Living on the Right Side of Dirt..."

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1 Answer

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The pulsating is the ABS system. It's actually pumping the brakes incredibly fast to even the braking to all wheels.
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You could have warped rotors. The need to be replaced or resurfaced. Does the steering wheel shimmy a little when applying the brake?

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1 Answer

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if the pulsating in the steering occurs while braking this is an indications that the rotors are out of round and need to be turned or replaced. if they are causing a pulsating while driving without braking it could be the calipers sticking.

your back brakes will be cooler than the front brakes as the majority of braking is done ith the front brakes even on four wheel disc brakes. hope this helps.

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