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Electric Parking Brake Wiring

Discussion in 'Model S' started by King_Ten_Ahead, Feb 18, 2018.

  1. King_Ten_Ahead

    King_Ten_Ahead New Member

    Joined:
    Feb 18, 2018
    Messages:
    2
    Location:
    Northwest Indiana
    Hello,

    I am seeking information as to how the EPB system works exactly in these cars.

    I would like to retrofit these calipers onto another vehicle, which, due to poor design properties have high failure ratings and an aftermarket supply that is even worse. I plan to use these in lieu of the oem hydraulic system, similar to the setup in The Model S.

    Essentially, I need to know how the system works and/or need wiring diagrams. I noticed they have a 4 pin connector, which I would hope is as simple as: Power, Ground, and Motor Polarities.. But I need confirmation of this and I also need to know what voltage the system runs off of.

    I am about to purchase calipers, but would like to get some more information on the subject before I pull the trigger and possibly waste my time/money.

    If more elaboration is needed, please let me know.

    If you have anything to say, add, or ask.. Please do!

    Thanks!
     
  2. King_Ten_Ahead

    King_Ten_Ahead New Member

    Joined:
    Feb 18, 2018
    Messages:
    2
    Location:
    Northwest Indiana
    Bump! Need to know ASAP !
     
  3. Randallman

    Randallman New Member

    Joined:
    Jun 28, 2018
    Messages:
    4
    Location:
    Sonora CA
    Hello I too have an OEM application for the Tesla Electric parking brake, I did buy a set of model S electric parking brakes on ebay, I ohmed the connector pins and pins 1 and 4 are motor. I connected to a 12V battery and confirmed in and out of the clamping actuator. The inside pins 2 and 3 must be a sensor, resistance reading is 450K my guess is possibly a current sensor or hall sensor.. not sure. My guess is the electronics that control this motor has current sensing and by monitoring the current the clamp force can be set.
     
  4. Randallman

    Randallman New Member

    Joined:
    Jun 28, 2018
    Messages:
    4
    Location:
    Sonora CA
    Hello I too have an OEM application for the Tesla Electric parking brake, I did buy a set of model S electric parking brakes on ebay, I ohmed the connector pins and pins 1 and 4 are motor. I connected to a 12V battery and confirmed in and out of the clamping actuator. The inside pins 2 and 3 must be a sensor, resistance reading is 450K my guess is possibly a current sensor or hall sensor.. not sure. My guess is the electronics that control this motor has current sensing and by monitoring the current the clamp force can be set. Maybe some technical assistance out there anybody???
     
  5. Don85D

    Don85D Member

    Joined:
    Mar 25, 2016
    Messages:
    331
    Location:
    Markham, Ontario
    It's a parking brake intended to keep a car from rolling after it has stopped. I doubt that you can apply fine control for stopping a vehicle and whether it would be safe to replace an hydraulic braking system. Hydraulic systems are robust and have dual braking capability if there is a failure to one pair of wheels.

    Perhaps for a big trailer or a ATV/Go Kart an electric disk brake would work and be legal as long as you are on private property.

    Whatever you decide get it safety checked before going out on public roads. Measuring some stopping distances in a controlled location might also reveal limits of your design.

    You should be able to find upgrade kits for hydraulic callipers. I have seen them used when people increase the size of the rotors. Some Brembos would be nice.
     
  6. Randallman

    Randallman New Member

    Joined:
    Jun 28, 2018
    Messages:
    4
    Location:
    Sonora CA
    Hi Don,
    My application is not for a vehicle, it will be used as a secondary redundant brake on a cable spool, I was just seeking electrical connection information. Thank you for the safety concern, I agree I would not use this brake as a customized stopping means on a vehicle that is driven on public roads without proper safety check and approval by some authority.
     
  7. FlatSix911

    FlatSix911 Porsche 918 Hybrid

    Joined:
    Jun 15, 2015
    Messages:
    6,245
    Location:
    Silicon Valley
    From the Tesla Service Manual wiring diagrams ... :cool:

    upload_2018-6-29_7-25-42.png

    upload_2018-6-29_7-28-30.png
     
    • Like x 1
  8. Randallman

    Randallman New Member

    Joined:
    Jun 28, 2018
    Messages:
    4
    Location:
    Sonora CA
    Thanks Don your awesome!
     
  9. FlatSix911

    FlatSix911 Porsche 918 Hybrid

    Joined:
    Jun 15, 2015
    Messages:
    6,245
    Location:
    Silicon Valley
    Glad to help... :cool:
     

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