2018 Prime braking noise

Discussion in 'Prime Care, Maintenance and Troubleshooting' started by Aqua55, Oct 6, 2018.

  1. Aqua55

    Aqua55 New Member

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    Hi everyone, I'm a new owner of a month old Prime. I started noticing some beaking noise when applying at very low speeds. Also, the breaks are a bit catchy at low speeds. Just wondering if this is normal for this model? Had only 11 miles on it so I doubt its the brake pads.
     
  2. EyePrime

    EyePrime Active Member

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    Don't worry that completely normal.:)
    The low speed catchy braking your referring to is the prime's regen braking being its unpredictable self;)
    I'm just joking about that the prime's regen braking is fine but like the idea of the Chevy bolt were you use a paddle mounted on the steering wheel to regen.
     
  3. bisco

    bisco cookie crumbler

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    normal, can you post the sound?

    catchy is when the regen cuts out and friction pads cut in. they are usually rusty from non use.
     
  4. Aqua55

    Aqua55 New Member

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    I'll see if I could upload the sound, but it's a creaking type of sound. I was told it could be the caliper?
     
  5. wb9tyj

    wb9tyj 2017 Prius Prime Advanced

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    Mine make noise too...more-than-likely its "rusty" rotors...so to clean them off...drive at a slow to moderate speed...pop the car into neutral...and then brake...the friction of the brakes will clean off the rotors...when you are in neutral, you will use friction braking...we've had this issue with all my prii since 2004...Do this after it rains or there is moisture...the grabbiness and or noise will go away and or diminish when you "clean the rotors"...
     
  6. PushingSquares

    PushingSquares Junior Member

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    Don't the pads take over when you come to a complete stop? Or am I misunderstanding the role they play on the car?
     
  7. bisco

    bisco cookie crumbler

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    the pads are actually in use any time you step on the brakes. it is a combination of foot pressure and speed.
    light braking puts very little pressure on the pads at speeds over 7 mph. as you push harder, the pads work more.
    at 7mph and lower, it's all pads, no regen.
     
  8. Chazz8

    Chazz8 Gadget Lover

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    I have been looking at ScanGauge II values to watch the cutover from regeneration to friction across our lifetime Prius fleet (Gen II, PiP, v, and Prime) and as long as you are braking within the Charge area of the energy regeneration status graphic no friction brakes are applied. I have also noticed that the Gen II cut-over to friction braking only at/near 7mph, and that cut-over speed got lower with each new Prius our family got. I see the PiP and v cut over to friction braking only between 3 or 4 MPG. I have not checked the Prime yet.

    In the Prime, I hit a known bump that can cause the brakes to switch from regen to friction and make it feel like you are accelerating for a split second, and it was the smoothest switch of any Prius in our fleet. Don't think it would freak drivers out like it has in the past. Good job continuing improving the brake systems Toyota.
     
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