I was recently driving in cruise control at about 70 mph on the highway. All the sudden my abs light and brake light lit up on the dash. The truck then began to start slowing down and accelerating over and over. The speedometer then starting fluctuating tremendously. Now just driving through town at around 35 mph the truck will not change gears then all the sudden will jump into gear. Both the abs light and brake light are on. The speedometer is also still going crazy. Im just an electrician but have very little experience w cars. Mainly I am wondering if this is a bad sensor or something more extreme. Im pretty mechanically inclined and am hopeful this maybe something I can fix on my own. I went to autozone and they told me they dont have the equipment to get abs codes? Thank you for any input!
Look under the truck at the ****** and check the wiring to the sensors if good may be a bad sensor,also check the wiring and connections to the abs wheel sensors [ located from frame to the hub behind the rotors ] the abs also acts as speed sensor if problem was with an abs sensor at the[ hub] wheel usually set the brake system to normal power brakes [if u hit brakes hard will lock up or skid wheels] with the abs light coming on if the speed sensor at ****** malfunction can and usually causes shift problems
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
SOURCE: 2000 GMC Sierra 1500 ABS and Brake lights
Have you by chance checked your fluid? If not, you may want to do that, it could show that you need brakes if it is low. If that doesn't do it, the mechanic may be right about a sensor, but just the wrong one. Hope that helps.
SOURCE: When I start my 2000 GMC Sierra the gear shift
someone has cut the dash off you need to go to the information center and press menu it will give the options to cut it on or off
SOURCE: 89 gmc s15 4c pickup
I would start by cleaning, and checking the operation of, the IAC valve.
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