the other morning i got in my truck to go to work and the abs and emergency brake light was on and wont go off, fluid is good, fuse is good and relay is fine.. my speedo started to act up the same morning , wont read till 20 mph and drops to 0 at 20. but i think it might be un related .. but my question is if there is a sensor or something somewhere that causes this this i can check or what you guys think thanks..

oh and the abs definitely isnt working i tried and the back tires locked right up

 

check this out and see if it helps with your problem and i think the way you describe it it might be the speedo sensor https://www.dieselbombers.com/24-val...ght-stuck.html

 

my truck does the same thing. just one morning i went out and they were both on. idk if this is right but somebody told me my abs sensor could be out.

 

same here, mines been on for about 2 months. def no abs anymore.

 

check the sensor in the rearend. it bolts in from the top. sometimes metal gets stuck to it. there is a exciter ring that it pressed on to the carrier before the ring gear is bolted on and sometimes they get damaged.

 

i'm going to check it tomorrow thanks for the help

 

ABS sensor in rearend mine did the same thing just fixed it after about 5 years

 

just had mine fixed abs light on due to speed sensor code 35.