TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC
Start a Discussionhttps://teslamotorsclub.com/tmc/tags/

Installed new e-brake caliper and will not engage

Discussion in 'Model S' started by AutobahnEV, Oct 11, 2017.

Tags:
  1. AutobahnEV

    AutobahnEV Member

    Joined:
    Mar 28, 2017
    Messages:
    73
    Location:
    El Cajon
    Hello,

    I have been putting together a 2014 MS 85 and I am on the last step which is hooking up the new park brake caliper since the previous one was smashed to smithereens in the accident. I spliced in a brand new female connector into the harness and plugged everything in. The caliper is getting power and there is response when I press the button to engage/disengage. I hear a noise in the caliper like it is trying to engage but not actually doing anything. I went back through all the splices and connections are all kosher. At a loss currently.

    Does anyone have experience with this? Or has anyone run into a similar issue? Is there a flash or a reprogram required when installing the new e-brake caliper?

    Any help is greatly appreciated! Thanks
     
  2. demundus

    demundus Member

    Joined:
    Jul 5, 2015
    Messages:
    495
    Location:
    Oceanside, CA
    Does the 2014 have autopilot? Is the ebrake from a car with autopilot? AFAIK there are different brake booster setups due to "hill assist" when that feature came into play
     
  3. MP3Mike

    MP3Mike Active Member

    Joined:
    Feb 1, 2016
    Messages:
    3,632
    Location:
    Oregon
    Are you sure that your new e-brake caliper isn't rusted/frozen in place?
     
  4. AutobahnEV

    AutobahnEV Member

    Joined:
    Mar 28, 2017
    Messages:
    73
    Location:
    El Cajon
    I hadn't thought about that. I need to find the VIN of the donor caliper. The 2014 I am building is an AP1 car so I am guessing it needs an AP1 compatible caliper.
     
  5. AutobahnEV

    AutobahnEV Member

    Joined:
    Mar 28, 2017
    Messages:
    73
    Location:
    El Cajon
    When I tested it before installation it closed and opened nicely so I would assume it is in good working condition. But that was just 12V power/ground so maybe with the two additional data wires in the harness it isn't getting the correct position or engage signal.
     
  6. demundus

    demundus Member

    Joined:
    Jul 5, 2015
    Messages:
    495
    Location:
    Oceanside, CA
    It's not specifically the caliper, but the brake booster, and the applicable booster fuses etc. AP1 car should have everything you need, if you pulled the caliper off a non AP car im not sure if that would cause an issue or not, but worth exploring

    Scroll down a bit to @wk057 's adventure in making a non AP car an AP car. Autopilot Retrofit on Classic P85 | wk057's SkieNET
     
    • Like x 1
  7. AutobahnEV

    AutobahnEV Member

    Joined:
    Mar 28, 2017
    Messages:
    73
    Location:
    El Cajon
    OK perfect, the car already has the AP1 ibooster, monocam, sensors etc so that's all good. I seem to have figured it out. Since the left rear e brake was disengaged and the right rear was engaged, they were out of sync so it seemed the car was confused about that (correct me if I am wrong). So what I did: First, I unplugged the new caliper in the open position, then I had someone get in the car and put it into neutral and disengage the other side so both calipers were open, then had him release the brake pedal and press park so the calipers would both engaged from the open position and it worked! The Park Brake warning light is gone and they're functioning properly. Now I need to figure out how to get rid of the "Park Assist Disabled" light and she will be roadworthy.
     
    • Like x 3
  8. MP3Mike

    MP3Mike Active Member

    Joined:
    Feb 1, 2016
    Messages:
    3,632
    Location:
    Oregon
    I would start with checking all of the ultra-sonic sensors in both the front and rear bumper covers to make sure they are all hooked up and there is nothing wrong with the wiring harness. (Assuming you haven't done that already.)
     
    • Like x 1
  9. AutobahnEV

    AutobahnEV Member

    Joined:
    Mar 28, 2017
    Messages:
    73
    Location:
    El Cajon
    Will do. Will post results after full sorting. Thanks everyone for the help.
     

Share This Page