2021 Trail Boss with 200 miles Service Brake Assist Message

[DougCBJ]

Got this notification earlier tonight. Didn't lose brakes this time, but got that message on the dash then onstar email stating the following:

 

An issue with the Antilock Braking System in your 2021 Chevrolet Silverado has been detected. Please service your vehicle within 7 days.

Please disregard this message if your vehicle is already in for service. Inaccurate notifications can be generated during service.

Please see your dealer for service.

 

 

Any others out there with similar issue or thoughts on this issue? Kinda bummed given this truck was rare with the 6.2 in steel metallic grey. Dealer said I was the last 2021 in the US that had the 6.2 with safety and that weird tailgate.

[JimCost2014]

26 minutes ago, DougCBJ said:

Got this notification earlier tonight. Didn't lose brakes this time, but got that message on the dash then onstar email stating the following:

 

An issue with the Antilock Braking System in your 2021 Chevrolet Silverado has been detected. Please service your vehicle within 7 days.

Please disregard this message if your vehicle is already in for service. Inaccurate notifications can be generated during service.

Please see your dealer for service.

 

 

Any others out there with similar issue or thoughts on this issue? Kinda bummed given this truck was rare with the 6.2 in steel metallic grey. Dealer said I was the last 2021 in the US that had the 6.2 with safety and that weird tailgate.

Congratulations on your new truck.

 

Take it in and have them fix it. If others have had the same issue, pretty sure no one has fixed it themselves.

[DougCBJ]

Yep got an appointment on the 3rd. Reading about similar issues for the 2018 to 2019 has me a little worried, but all I can do is take it to the dealer and have em look at it. I'll just pray that it isn't some part that is a month away lol. I'm winning the new car lottery though. I just traded in my 2016 SS that had the 8 speed rumble strip issue since the beginning of 2016 that they couldn't permanently fix.

Edited June 2, 2021 by DougCBJ

[DougCBJ]

Update, dealer said the master cylinder is losing pressure, so that will need replaced. They are letting me have the truck back saying it's no issue as far as driving safely. Is this true lol nervously?

[SporkLover]

2 hours ago, DougCBJ said:

Update, dealer said the master cylinder is losing pressure, so that will need replaced. They are letting me have the truck back saying it's no issue as far as driving safely. Is this true lol nervously?

 

Im guessing something is lost in translation between the Tech, the Service Advisor, and you.  If the Master Cylinder is losing pressure that is usually not a good thing.  Fluid leaking past the pistons/valves, meaning poorer braking performance, just depending on how bad and what is causing the leak. 

 

Total guess/reach here..... my guess is that it is probably more along the lines of the power assist has issues which might require an entire master cylinder replacement especially if it is a single unit.  When the power assist goes out you can still brake it just requires more force on your end.