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2020 2500 HD electric parking brake woes and fix

digger86
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digger86 New Member

digger86

Posted
Posted (edited)

Just wanted to share my experience, I got the "service parking brake" message awhile ago, it's just a parking brake. 🤓

 

I have the Ford/Allison MGM 10L1000 transmission so I need to get the truck to the dealer for the software bailout (N242454440). But before I do that I wanted to get all the DTCs cleared and such, last thing I need is the dealer telling me what they want a few $k for a parking brake job, I am strong believer in the right to repair. Alldata lists 2.4 hours of labor for both wheels.

 

I had an XTOOL AD20 Pro OBDII scanner quickly on hand and I pulled:

 

C15DD-00 Parking brake excessive wear detected Brake System Control Module (BSCM)
C15DD-00 No description found-Electronic Brake Control Module (EBCM)

 

I went to O'Reilly Auto and the shoes that they have listed do not work with this model truck. At the time written, the model number does not match, you can read my one star review with a picture of the OEM one here:

https://www.oreillyauto.com/detail/c/brakebest-select-brake-shoes/brakebest-select-brake-shoes-9-inch-bonded-brake-shoes/bgs0/1050/v/a/149155/automotive-truck-2020-chevrolet-silverado-2500-hd?q=parking+brake&pos=0,


this shoe and the one Napa has listed too do not fit. The employee at Napa had a hard time finding the part number and he even brought the part to the desk and cut the plastic off so that we can compare to the OEM ones that I brought in. They did not match.


I order Powerstop B1117, I have used a lot of Powerstop brake products over the years without issue(s). And this was no exception.

 

I also have a Thinkcar 689BT bidirectional scan tool, this has been a great tool! I was having an issue with the driver side express window close feature not working when closing. I used the scan tool to fix this. I have also learned that the truck definitely has current draw while powered off. This was proven with seeing the the DTC B3883-01, I removed the OEM rear bumper and installed a Hammerhead bumper.

 

When I pulled the rear passenger side rotor off, the shoe facing to the rear was down to the metal! I do not recall driving with the parking brake on! And I would think that the truck would warn you about the behavior! I found that someone else had a similar issue, https://www.gm-trucks.com/forums/topic/267997-service-parking-brake/

And as mentioned the brake shoes can be replaced without pulling the hub off, and be sure to have 45 degree needle nose pliers and other small picking and pulling tools, this is a PITA!

 

Using the 869BT I actuated the right rear parking brake, but I made the mistake of doing it with the rotor off and the actuator expanded to as far as it could go and an error popped up on the scan tool, “device limits exceeded anti-lock braking system solenoid valves or pump motor malfunction” and it did not retract. I am not sure if this is the way it was supposed to function, expand 1st and then retract? If this is the correct function, I suspected that it was trying to find the resistance of the rotor being in place and effectively engaging the parking brake 1st and then releasing. This make sense because I recall reading that the system time to retract (2.5 seconds?) is monitored and if the time is exceeded the DTC is set. So if you get in this situation pull the actuator motor off use a T-40 torx to retract the actuator, I had a Dewalt right angle drill that helped with this. Once the shoes were replaced I tested my theory by actuating the right rear parking brake with the rotor on and it did apply pressure 1st and then retracted. Started the truck and applied the EPB on and off three times, the error cleared.

 

Yes, I still have the driver side shoes to replace, but it is just a parking brake and now I can the truck off to the dealer for the recall fix.

Before I ordered the Powerstop shoes I called around to 4 dealers and non of them had the shoes in stock and I was told that it would cost $130 per a wheel. I paid $31.99 for the Powerstop ones and they came with new retaining clips, the O’Reilly and Napa ones where shoes only in the box.

While having the truck on without the engine running I noted the voltage was low, the Thinkcar scanner shows real time voltage when connected, is was as low as 11.58v. So I added an onboard Noco2D charger, the truck does a lot of sitting, I have “Dad’s ski wagon”, a 2002 Subaru LL Bean Outback that keeps the mileage low on the truck.

 

Torque values from Alldata:

Rear brake caliper bracket bolt 221 ft lb, I cleaned the threads and add Loctite 242

Parking Brake Actuator Bolt 106 in lb (round up to 9 ft lb)

Parking Brake Actuator Splash Shield Replacement – Inner 16 ft lb

acuator_t40.jpg

oem_brake_shoes.jpg

right_parking_brake_actuator.jpg

Edited by digger86
  • Like 2
SoCal Angler Enthusiast

SoCal Angler

Posted
Posted

 Very good write up on EPB, parts, and replacing shoes.  Details and pics are important and appreciated for the average DIYer.  Thanks for the post!

34256 Enthusiast

34256

Posted
Posted

Good writeup, my 2020 LTZ was done 3000 km ago, after market shoes, pretty much same story, dealer wanted $1500. My mechanic did it for just over $600.

34256 Enthusiast

34256

Posted
Posted

Xy74, my parkbrake shoes separated from brake material, i had never used them and the bonding process let go. I wish supplier's would bring back brake material riveted to metal shoes.

XY74 Enthusiast

XY74

Posted
Posted

An isolated flaw no doubt......... according to GM.  :)  

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