Service Brake soon

[Amaster]

I had my Yukon xl for about 3 weeks and I keep having my service brake soon I heard that this could be a leaky brake booster or master any thoughts

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[Doubeleive]

I had my Yukon xl for about 3 weeks and I keep having my service brake soon I heard that this could be a leaky brake booster or master any thoughts

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is it just the brake light or is abs lit up as well?

 

[Doubeleive]

if it is just the brake light you could have low fluid, funky fluid level sensor (if equipped), or stuck proportioning valve.
if the abs light is on also could be abs pump or air in the abs pump.

 

[Amaster]

Neither just as I'm driving the little screen comes up service brakes soon abs still work good and master is full pads on fronts and rears are like brand new

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[swathdiver]

You need a good scan tool or a bi-directional that can read chassis codes (ABS). With that you can pull any stored trouble codes and see how much pressure is in the system and whether or not it bleeds off as you press the pedal plus lots of other things.

 

[Amaster]

You need a good scan tool or a bi-directional that can read chassis codes (ABS). With that you can pull any stored trouble codes and see how much pressure is in the system and whether or not it bleeds off as you press the pedal plus lots of other things.

Well I did get something on my good scanner P0174 and P0101 but those just maybe stored from other vehicles

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[swathdiver]

Well I did get something on my good scanner P0174 and P0101 but those just maybe stored from other vehicles

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Well, I would clear those and query the system again.

 

[Amaster]

Well, I would clear those and query the system again.

Just checked it again when I got home no codes

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[Doubeleive]

the only reason "service brakes soon" comes on alone (no abs light) is if the fluid is low (or it thinks it is low i.e. faulty fluid level sensor) or the prop valve is stuck.
in either case you won't have a code, your only indication will be with a advanced scanner such as a tech2 that can read the brake fluid level status
as a test try unplugging the brake fluid level sensor, if the message goes away then it's likely the sensor unless you had brake work done lately and the prop valve got stuck in the process, in this case you can try bleeding the brakes slowly especially the rear. if there was no brake work done recently and the message is gone with the sensor unplugged then I would just replace the fluid sensor (easy fix)

another thing to try if the prop valve is suspect (again only if work was done recently) is to drive and do several emergency stops, hit the brakes real hard, sometimes this unjams the prop valve.

 

[Amaster]

the only reason "service brakes soon" comes on alone (no abs light) is if the fluid is low (or it thinks it is low i.e. faulty fluid level sensor) or the prop valve is stuck.
in either case you won't have a code, your only indication will be with a advanced scanner such as a tech2 that can read the brake fluid level status
as a test try unplugging the brake fluid level sensor, if the message goes away then it's likely the sensor unless you had brake work done lately and the prop valve got stuck in the process, in this case you can try bleeding the brakes slowly especially the rear. if there was no brake work done recently and the message is gone with the sensor unplugged then I would just replace the fluid sensor (easy fix)

another thing to try if the prop valve is suspect (again only if work was done recently) is to drive and do several emergency stops, hit the brakes real hard, sometimes this unjams the prop valve.

Where's the senor plug out of curiosity?

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