brake pad replacement results in 43 mph warning with brake system failure warning

[Madmaximus13]

I replaced the brakes with A/C Delco heavy duty semi metallic with new sensor and pads. A whole bunch of warning lights when off. Had the truck towed to the dealer will be inspected Monday. That photo is not from my truck but you get the idea. So WHAT TROUBLES ME ASIDE from the lights and tow. Is the inside drivers pad was worn to the metal the rest were about 40% left.

The brake pads were super easy to change. Remove 2 cotter pins, remove 2 retaining pins, the pads slide right out after slowly pushing the calipers back in. Easy brakes I ever replaced. I have replaced 50 sets or better since I was 16. The sensor a little bit of a pain but what electrical item isn't at the connector. Slides right back in on the pad side good design on Chevy's part.

Truck: 2019 High Country 1500 6" Rough Country lift and 35" Fury County Hunter R/T sitting on 22's. Just under 25k on it.

I saw a thread about pumping the pedal to 3/4 then fully depressing and repeating until full pedal pressure is achieved before starting the vehicle this may take several times pumping up the brakes before it works.

Same thread also talked about clearing codes then restarting. I wish i had thought of that prior to having to towed. I was tired I guess.

Edited November 21, 2021 by Madmaximus13
not done

[rbdjr]

Maybe the connector came undone? Did the pedal still feel ok when the light warning came on? Im thing wire rubbed against something or came unplugged?

[Madmaximus13]

No it seemed fine aside from being hard to push. I checked the connector and put electric tape around it just to be sure.

[2016 Sierra Owner]

I don't think you can just push the caliper back in on these trucks the way it used to be done. Not saying it can't be done. Just that something in the new brake system doesn't like it done that way.

[AirForceAngler]

43 minutes ago, 2016 Sierra Owner said:

I don't think you can just push the caliper back in on these trucks the way it used to be done. Not saying it can't be done. Just that something in the new brake system doesn't like it done that way.

You're probably right.  Anytime I do brakes on a vehicle with ABS, I push the calipers back while opening the bleeder.  The ABS controllers, don't like having fluid pushed back through them.  

[newdude]

52 minutes ago, 2016 Sierra Owner said:

I don't think you can just push the caliper back in on these trucks the way it used to be done. Not saying it can't be done. Just that something in the new brake system doesn't like it done that way.

 

 

On the rears, yes.  The parking brake being electronic, you have to place the caliper into service mode.

 

 

[newdude]

19 hours ago, Madmaximus13 said:

I replaced the brakes with A/C Delco heavy duty semi metallic with new sensor and pads. A whole bunch of warning lights when off. Had the truck towed to the dealer will be inspected Monday. That photo is not from my truck but you get the idea. So WHAT TROUBLES ME ASIDE from the lights and tow. Is the inside drivers pad was worn to the metal the rest were about 40% left.

The brake pads were super easy to change. Remove 2 cotter pins, remove 2 retaining pins, the pads slide right out after slowly pushing the calipers back in. Easy brakes I ever replaced. I have replaced 50 sets or better since I was 16. The sensor a little bit of a pain but what electrical item isn't at the connector. Slides right back in on the pad side good design on Chevy's part.

Truck: 2019 High Country 1500 6" Rough Country lift and 35" Fury County Hunter R/T sitting on 22's. Just under 25k on it.

I saw a thread about pumping the pedal to 3/4 then fully depressing and repeating until full pedal pressure is achieved before starting the vehicle this may take several times pumping up the brakes before it works.

Same thread also talked about clearing codes then restarting. I wish i had thought of that prior to having to towed. I was tired I guess.

 

 

 

I'd start easy and double check you've got the sensor clipped in all the way to the pads, the connector as well.  Also check the orientation of it.

 

Otherwise, you will need a code reader that can read all systems (BlueDriver or OBDMXLink) and see what codes are tripping the message.  

 

On the pad wear, we are seeing it at work as well (Western NY).  Both the front and rears.  Seems to be from pads binding hard in the calipers, as well as these "FNC Coated" rotors they are using that rust right the hell out.  

Edited November 22, 2021 by newdude

[Tony69]

Just encountered this issue. Replaced front brake pads on 2021 Chevy Tahoe, there are no electrical connectors directly connected to the caliper, only the pad wear sensor. Brakes replaced easy, and installing a new pad wear sensor was also easy. I have ensure proper installation of the pad wear sensor about 5 times now. Connected scan tool, and reset pad life. Issue is still present. DTC is “P25A2:00- Brake system control module requested MIL illumination” I have no idea what this means. I cannot clear the code. 

[newdude]

7 minutes ago, Tony69 said:

Just encountered this issue. Replaced front brake pads on 2021 Chevy Tahoe, there are no electrical connectors directly connected to the caliper, only the pad wear sensor. Brakes replaced easy, and installing a new pad wear sensor was also easy. I have ensure proper installation of the pad wear sensor about 5 times now. Connected scan tool, and reset pad life. Issue is still present. DTC is “P25A2:00- Brake system control module requested MIL illumination” I have no idea what this means. I cannot clear the code. 

 

 

You've got more codes you aren't seeing.  Should be some codes starting with a "C".  You need to find out what ones are in the computers.  

[repairman54]

There are 4 code families in GM vehicles. P, U, C and B.

Doing your own work then you need a scan tool that can read all 4 code families along with some bidirectional service mode capability to be able to do a proper repair / diagnosis. Or pay someone to use theirs. 

engine-codes.com is a code resource. 

[SC4R3C120W]

20 hours ago, Tony69 said:

Just encountered this issue. Replaced front brake pads on 2021 Chevy Tahoe, there are no electrical connectors directly connected to the caliper, only the pad wear sensor. Brakes replaced easy, and installing a new pad wear sensor was also easy. I have ensure proper installation of the pad wear sensor about 5 times now. Connected scan tool, and reset pad life. Issue is still present. DTC is “P25A2:00- Brake system control module requested MIL illumination” I have no idea what this means. I cannot clear the code. 

i am about to do pads on my 2020. I have 98,000miles on it and screen shows 50%. i do notice a decrease in breaking since i bought it. My question is did you start by putting the system in the correct mode before starting? I've seen multiple videos about holding the e-brake button, then hitting the brakes and e-brake again to put it in service mode.  Can anyone confirm they did this before work and still got the codes?

[Forrest Woods]

I clicked on this site when I read the headline that said 43mph top speed break system failure. That's what the 2020 GMC Sierra 1500 reads on the dashboard after installing new rear break pads. And the truck will not go over 43mph. Anyone know the solution to my dilemma. Please and Thank you, WOODSZ