Break inspection help (pics)

Discussion in 'Tires / Brakes / Bearings / Axles' started by John Rock, May 27, 2018.

  1. John Rock

    John Rock Member

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    Apr 16, 2018
    Quebec
    Hi,

    I tried my new to me 2009 Pony for the first time yesterday with a new electronic break controller and couldn't lock up the brakes, even at max settings.

    I adjusted the brakes (with screwdriver in slot) but they seemed ok already, so I decided to remove one drum to see the mechanics. Here are the pictures. What should I be looking/testing for?

    Note that the magnet is moving freely, the front pad moves when I pull on the bronze lever and the rear pad doesn't move or very little. Also, it was really hard pulling off the drum. Is that normal?

    Thanks 20180527_150917.jpg 20180527_150924.jpg 20180527_150943.jpg 20180527_150952.jpg 20180527_151001.jpg 20180527_151052.jpg
     
    Orchid likes this.
  2. Raycfe

    Raycfe Waterford Ct.

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    Oct 3, 2007
    Waterford, Ct
    Everything looks in order

    When the magnet is energized it will pull the arm back, pushing the top of the front shoe which will want to turn with the drum and push the the rear shoe at the bottom to do most of the braking. The rear shoe will not move much at all on the top. This is called self-energizing brakes. Cars used this design for years (not with magnets, but wheel cylinders). You may have had a bearing stuck on the spindle or didn't back off the brake shoes enough.
     
  3. John Rock

    John Rock Member

    88
    3
    Apr 16, 2018
    Quebec
    It does look pretty good. So if there's no mechanical issues, is it possible that the surface of the pads are too slippery to lock the drums? Otherwise, maybe by default I'm not leaving enough friction? I've read that it could be the break controller not really outputting enough voltage? Not sure how to troubleshoot from here, but I feel like the brakes aren't powerful enough although I don't have prior experience
     
  4. nineoaks2004

    nineoaks2004 Every meal is a picnic and every Day is a holiday

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    Graceville, Florida
    The controller might need adjusting too. (usually a knob on the controller) also could be any of the other thing mentioned.
     
  5. John Rock

    John Rock Member

    88
    3
    Apr 16, 2018
    Quebec
    I have a newly installed Primus IQ which seemed to operate as per manual instructions. I started testing at the 6 level, then ramped it up to 12 and didn't see a huge difference and it didn't lock the breaks. I then tried all the boost modes and didn't see that much difference either and still no locked brakes. Perhaps I should ask the previous owner if he was able to lock them..
     
  6. Customer

    Customer Well-Known Member

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    Jun 5, 2014
    I assume those are 7" brakes, if so they aren't likely to lock up on pavement, many don't.
     
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  7. John Rock

    John Rock Member

    88
    3
    Apr 16, 2018
    Quebec
    Ah! If that's the case, I'm trying to solve an non problem! Why don't 7" brakes lock up on pavement?
     
  8. John Rock

    John Rock Member

    88
    3
    Apr 16, 2018
    Quebec
  9. silvermickey2002

    silvermickey2002 Morris County, NJ

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    Sep 11, 2008
    Morris County, NJ
    I have 7" brakes as well and never been able to lock them up. When you hit the button on the brake controlled manually and feel the brakes on the trailer grab then they are working.
     
  10. Raycfe

    Raycfe Waterford Ct.

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    Oct 3, 2007
    Waterford, Ct
    I agree. Seven inch brakes usually don't have enough surface area to lock up ..... but they do help stop the camper and TV.
     
  11. soft 17

    soft 17 Active Member

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    Mar 14, 2017
    San Luis Obispo
    Looks good. Just make sure that the shoes are adjusted properly.
     

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