Question about 2003 GMC Yukon XL

1 Answer

Why, after hitting a bump in the highway and braking at the same time, did my brakes fail - how can I fix this dangerous situation - my mechanic is baffled?

It has been happening inconsistently over the last 18 months - now the car is too dangerous to drive. Why is this happening and how can it be fixed?

Posted by on

  • lisa
    lisa May 06, 2014

    Thank you so much for your prompt and insightful response. As I mentioned, my mechanic is baffled and asked me to google to get some insight. I will pass this along and let you know how it goes. Thanks again! Lisa

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 3,679 Answers

Has your vehicle got ABS braking system ? if so i'd get the OBD codes read if not already done as may be a sensor/switch that is sending an incorrect signal to the brake system after the bump at the same time , there is sometimes a brake limiter valve fitted to the rear suspension ,if your vehicle has this component i'd have that checked as the suspension will obviously rise/fall when going over bumps , let me know how your mechanic responds to these suggestions

Posted on May 06, 2014

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad
fixincars
  • 335 Answers

SOURCE: I have a 2003 GMC

If someone took the time to look at the electrical schematic you will see several grounds in the circuit My first place I would go would be to check all the Grounds and Connections for the Brake Fluid level control, Brake Warning Indicator
The Instrument Panel Cluster (IPC) illuminates the brake warning indicator when one or more of the following occurs:

  • The body control module (BCM) detects that the park brake is engaged. The IPC receives a class 2 message from the BCM requesting illumination.
  • The electronic brake control module (EBCM) detects a low brake fluid condition. The IPC receives a class 2 message from the EBCM requesting illumination.
  • The electronic brake control module (EBCM) detects a closed brake pressure differential switch. The IPC receives a class 2 message from the EBCM requesting illumination.
  • The EBCM detects an ABS malfunction which disables dynamic rear proportioning (DRP) . The IPC receives a class 2 message from the EBCM requesting illumination.
  • The IPC detects a closed power brake booster alarm switch and closed power brake booster fluid flow alarm switch. The IPC illuminates the brake warning indicator and sends a class 2 message to the radio requesting the brake warning alarm.
  • The IPC performs the bulb check at the start of each ignition cycle. The brake warning indicator illuminates for approximately 3 seconds before turning OFF.
  • The IPC detects a loss of class 2 communications with the BCM or with the EBCM.
Driver Information Indicators and Messages
The following indicators are used to inform the driver of several different factors.

Brake Warning Indicator
The Instrument Panel Cluster (IPC) illuminates the brake warning indicator when the following occurs.
  • The Body Control Module (BCM) detects that the park brake is engaged. The IPC receives a serial data message from the BCM requesting illumination. The brake warning indicator flashes at a rate of approximately twice per second when the park brake is engaged.
  • The EBCM detects a low brake fluid condition or base brake pressure differential and sends a serial data message to the IPC requesting illumination.
  • The IPC performs the bulb check.
  • The EBCM detects an ABS-disabling malfunction which also disables Dynamic Rear Proportioning (DRP) and sends a serial data message to the IPC requesting illumination.

Here is a description of how the system works But i would check my Grounds and connections
www.aceautomotive1.com
Contact me if you need any more information Ill be glad to help

Posted on Aug 02, 2008

tripletauto
  • 1450 Answers

SOURCE: Sudden brake failure

You need to check the fluid in the master cylinder first. if it is empty you have a leak somewhere. if full then probably a bad master cylinder.brakes just being worn will not cause you to lose all pedal. while if they are worn should be replaced if they say you just need a brake job then be suspicous

Posted on Oct 30, 2008

  • 217 Answers

SOURCE: brake dash light and abs dash light comes on when a bump is hit

if the brake pedal is low than the problem could be that the brakes need replacing and the other problem could be a problem with the ABS system

Posted on Jan 17, 2009

  • 653 Answers

SOURCE: steering shimmy when brakes applied

It sounds like either warped rotors or grease/oil on the pads. Jack up the front and pull the wheels off. Turn the rotors by hand to see if the rotors turn freely, then drag, then turn freely. If there is no grease or oil on the rotor surfaces, you need to either turn or replace the rotors. The job is a royal pain in the ****, so you may want to take it to a reputable shop.

Posted on Apr 04, 2009

  • 1 Answer

SOURCE: Whole car shakes when I hit a bump on the road

I had a similar problem and found that there are more than one possible cause. The simplest and least expensive is to have the front wheels balanced on a dynamic machine balancer. Then, reinstall the wheels/tires and give it a test run. If the problem is gone, your have fixed it.. If it persists, chances are that you have other suspension or shock problems. Get the front end aligned and checked for looseness or slack which would allow the tires to be pointed in different directions at the same time in a rapidly alternating manner. These are NOT things you can do without the benefit of a professional with the right tools and knowledge. A test drive with that professional mechanic will be a good place to start. If you want to save your tires and your personal well-being, it is wise to get this problem identified and resolved quickly. You represent a danger to yourself, your vehicle, your family, and to any other driver or pedestrian or obstacle in your path.. Bite the financial bullet and get it fixed, PRONTO!, or park it and walk.

Posted on Oct 02, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

What would be causing a noise in the front end that sounds like someone hitting can when braking & going over bumps?


Sounds like the wheel is touching something when the nose goes down a bit. I had a similar problem and found it was the stone guard under the front fender

May 07, 2014 | 2004 Chevrolet Malibu

1 Answer

Everytime i go on 40 mph or above and hit a bump the whole car shakes as if i have a flat in the front


Couple things to look at:

Tire inflation pressure
Tire Balance
Front end wear - including ball joints etc.
Steering gear wear or adjustment
Front end alignment
Faulty wheel bearings

You probably cannot fix this. Please take your 1995 Jeep to your mechanic that specializes in front end maintenance and have him or her take a look at it. Get this done soon as I think your car is dangerous to operate at this time to both you and others on the highway. This condition will not improve if you ignore it.

Jun 05, 2011 | 1995 Jeep Grand Cherokee

1 Answer

Low speed rattle from front end --especially when right front tire hits a small bump.


If the problem goes away when brake is applied, then a loose brake bad or missing pad clip is possible. Either way, you should have it inspected. A loose brake pad is not dangerous at all, but something else loose under there could be potentially catastrophic, such as a tie-rod end or a ball joint.

Feb 17, 2011 | 2006 Mercedes-Benz R-Class

1 Answer

Details on brake lines leaking in middle on the frame


The details are: your brake lines are deteriorated to the point of being a danger both to yourself and others who share the highway with you. If there is one leak now, there will be more in the future. Please take your 15 year old car to your mechanic and have him or her replace the lines and of course, change the fluid. It may also be time for a complete brake job. Stopping is much more important than starting. Make sure you can stop.

Thanks for your question at FixYa.com

Jan 30, 2011 | 1996 Ford Explorer

2 Answers

My feont wheels shake somrtimes when i hit a bump


Hi Tony,

There is a problem with either the the wheel integrity, the steering linkage or all the above.

This is a dangerous and potentially life threatening situation.

As someone who has lived through a ball joint breaking off of it's connecting rod, I can tell you first hand that a steering wheel that doesn't steer is no fun at highway speeds.

Please have your vehicle looked at by a pro.
If you drive it, drive it slow, but drive it to a mechanic.

Mike

Nov 12, 2009 | 1988 Suzuki Samurai

1 Answer

Whole car shakes when I hit a bump on the road


I had a similar problem and found that there are more than one possible cause. The simplest and least expensive is to have the front wheels balanced on a dynamic machine balancer. Then, reinstall the wheels/tires and give it a test run. If the problem is gone, your have fixed it.. If it persists, chances are that you have other suspension or shock problems. Get the front end aligned and checked for looseness or slack which would allow the tires to be pointed in different directions at the same time in a rapidly alternating manner. These are NOT things you can do without the benefit of a professional with the right tools and knowledge. A test drive with that professional mechanic will be a good place to start. If you want to save your tires and your personal well-being, it is wise to get this problem identified and resolved quickly. You represent a danger to yourself, your vehicle, your family, and to any other driver or pedestrian or obstacle in your path.. Bite the financial bullet and get it fixed, PRONTO!, or park it and walk.

Oct 02, 2009 | 1992 GMC Yukon

2 Answers

Master cylinder is leaking


You will eventually lose your brakes and not be able to stop - this is a very dangerous situation and you should not drive the vehicle until it is repaired by a qualified mechanic!

Jul 10, 2009 | 2000 Ford Taurus

1 Answer

Shaking on the highway


Check your wheel bearings and at the same time check your brake pads.

Jun 13, 2009 | 1999 Dodge Ram

1 Answer

95 lincoln towncar dives to the left when hitting a bump scarey when travelling on highway or mountain turns


as soon as you can take your car to a mechanic and have front suspension checked it sounds like a dangerous situation maybe a bad tie rod end or ball joint...if either should fail you can lose control of the car

Apr 25, 2009 | 1995 Lincoln Town Car

Not finding what you are looking for?
2003 GMC Yukon XL Logo

Related Topics:

80 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76109 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...