Question about 2003 GMC Yukon XL
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?
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
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Posted on Jan 02, 2017
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 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.
Here is a description of how the system works But i would check my Grounds and connections
Contact me if you need any more information Ill be glad to help
Posted on Aug 02, 2008
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
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
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
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
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