Service brakes soon

[ProvokedSavage]

I recently bought a 2010 Silverado 1500 4.8 with almost 300k miles. Trucks runs smooth and has no issues or weird noises. Except the service brakes soon and my brake pedal is soft. I replaced the front brakes haven’t done the rear(have drums)I tried bleeding the brakes to see if the pedal would get stiffer but nothing... unless I did it wrong which I doubt it.

Plz help and it’s giving me that code.

Thanks guys

 

 

 

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[Doug_Scott]

Have you looked into the error message shown in the photo you attached? 

 

Have you checked the rear brakes? If they have lots of shoe left, make sure they are adjusted properly and that the parking brake is also adjusted correctly.  Never use the parking brake adjuster to adjust the brakes.  The parking brake should be completely backed off prior to adjusting rear brakes. 

[ProvokedSavage]

No i haven’t checked the rear breaks I have a feeling it might be the rear. They make kinda like a squeak when I press them and let them go in the rear.


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[Jsdirt]

Could be a failed sensor, sensor wiring problem, ABS unit issue, or the sensor became unplugged - any of those will set that code. You'd need to do some testing to find out which.

 

Should be a 3 wire sensor - one will be a 5v reference, one ground, and one signal (the 5v ref pulled down to between  .13 -3.3v). With just a multimeter, you can figure out which is which, without a wiring diagram. One will read 5v (or close to it), one will read in mV (ground), and the signal SHOULD be between .13-3.30v   Since the code is for an "open", either the sensor has no continuity from the ref to signal, there's no 5v ref present, or the female pins in the plug aren't making good contact with the male sensor pins.

 

If your brakes are mushy, the ABS unit could be air bound,  you've got a failing master cylinder ... or it could just be worn out components (hoses, master, booster, calipers, wheel cylinders) - at that mileage level, that is a very high possibility. That's a separate issue from the code you've got, however. 

 

If you want to learn how to test these circuits, check out ScannerDanner on Youtube - he's a diagnostic legend.

Edited May 15, 2018 by Jsdirt

[ProvokedSavage]

Could be a failed sensor, sensor wiring problem, ABS unit issue, or the sensor became unplugged - any of those will set that code. You'd need to do some testing to find out which.
 
Should be a 3 wire sensor - one will be a 5v reference, one ground, and one signal (the 5v ref pulled down to between  .13 -3.3v). With just a multimeter, you can figure out which is which, without a wiring diagram. One will read 5v (or close to it), one will read in mV (ground), and the signal SHOULD be between .13-3.30v   Since the code is for an "open", either the sensor has no continuity from the ref to signal, there's no 5v ref present, or the female pins in the plug aren't making good contact with the male sensor pins.
 
If your brakes are mushy, the ABS unit could be air bound,  you've got a failing master cylinder ... or it could just be worn out components (hoses, master, booster, calipers, wheel cylinders) - at that mileage level, that is a very high possibility. That's a separate issue from the code you've got, however. 
 
If you want to learn how to test these circuits, check out ScannerDanner on Youtube - he's a diagnostic legend.

Thanks so much. I’ll go look at some of his vids


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[Michael078585]

I have 07 Silverado nbs. Service brakes soon is on the dash. Its not low fluid. Does it sense the shoes in the rear. I recently replaced the front pads.

[Usafloadc17]

I had this issue and it was the brake boost sensor.   Replaced with a cheap Amazon one and the message went away.