Prius pulling to right under regen braking

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by codycowgill, Oct 9, 2019.

  1. codycowgill

    codycowgill Junior Member

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    Hello all, I started noticing a problem with my prius pulling to the right under regen braking. I tested the car braking in neutral and there is no pull. Thoughts?
     
  2. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    Problem is likely in the right side half-shaft axle.
     
  3. Mendel Leisk

    Mendel Leisk Titanic Social Director

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    I had a brake fluid change once that left one rear (drum) brake inoperative. Just for giggles: jack up the rear, spin a rear wheel then have an assistant push down the brake pedal, see if it stops the wheel. Try this on both sides.

    Symptoms I noticed: seemed to take longer coming to a stop, ABS was going off a lot, and there was an odd side-to-side rocking, just before full stop.
     
  4. codycowgill

    codycowgill Junior Member

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    The CV axles are both new. What part of the shaft would be causing this?
     
  5. codycowgill

    codycowgill Junior Member

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    So any other suggestions? It is not the normal brakes causing the problem it is only under regen brakes or when I put it in B and let off gas
     
  6. bisco

    bisco cookie crumbler

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    did it do it before they were replaced?
     
  7. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    I wish I could guide you further- just offering support in the logic department. Regenerative braking and engine braking both depend on the torque coming back through the driveshafts to the differential. The diff combines the force and delivers it up to the trans.

    If a wheel bearing is worn, a CV joint binding too tightly…? I’m really not sure where to look. Might help to take temperature measurements of the bearing hubs at the bottom of a hill immediately after descent.
     
  8. Mendel Leisk

    Mendel Leisk Titanic Social Director

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    I wouldn't presume to know when it's regen braking vs friction braking (or both?). Again I would recommend to raise the rear and verify you have braking on both sides.

    One other question: is braking distance the same as usual, does it seem to take longer to stop? Or no?
     
  9. bisco

    bisco cookie crumbler

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    it's always regen with foot off both pedals?
     
  10. Mendel Leisk

    Mendel Leisk Titanic Social Director

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    Yeah must be.
     
  11. fuzzy1

    fuzzy1 Senior Member

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    Note that regen and B are just 2-wheel (front) braking, while normal friction braking (when in Neutral) is 4-wheel. A problem at one wheel position will be more noticeable when braking with just 2 wheels, and somewhat masked in 4 wheel mode.
     
  12. codycowgill

    codycowgill Junior Member

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    So when I have it on B and let my foot off gas the car pulls. Also when I put in in neutral and hit the brakes it doesn't pull. That is why I don't think the friction brakes are the problem. It did not pull before the axles were replaced. Both wheel bearings are about a year old.
     
  13. codycowgill

    codycowgill Junior Member

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    So was able to get some time to look at it. I had replaced the tie rod ends and forgot to put the cotter pins back in the crown nuts *facepalm* so they had almost backed completely off and fallen out. Yikes.
     
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  14. Mendel Leisk

    Mendel Leisk Titanic Social Director

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    These guys?

    upload_2019-10-15_8-15-48.png
     

    Attached Files:

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  15. codycowgill

    codycowgill Junior Member

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