Grooved Rotors

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Jacob156, Apr 17, 2026 at 9:41 PM.

  1. Jacob156

    Jacob156 New Member

    Joined:
    Jan 14, 2026
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    Location:
    Iron Mountain
    Vehicle:
    2016 Prius
    Model:
    Four
    upload_2026-4-17_20-35-12.jpeg

    I was wondering if it would be worth resurfacing these rotors or replacing them? The brakes are in great shape and they only have 70,000 miles on them. This happened after the car sat in the rain, which caused surface rust on the rotors. After I drove the car these grooves developed. I am pretty sure the rotors aren’t near the minimum thickness. Just wondering if it is worth resurfacing these rotors. The problem is the pads are good so should I use the same pads and resurface or replace the pads and resurface? Thanks for any advice.
     
    #1 Jacob156, Apr 17, 2026 at 9:41 PM
  2. JC91006

    JC91006 Senior Member

    Joined:
    Nov 10, 2013
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    Location:
    Los Angeles, CA
    Vehicle:
    2008 Prius
    Model:
    II
    How do you know the brakes are in great shape?

    if this is caused by the rain, you can try pressing the brake with a little force while in NEUTRAL. On a non busy street, go about 40 mph and then put the car in neutral and brake. This will allow the brake pads to clean off the rotor, without using the electronic braking.
     
    #2 JC91006, Apr 18, 2026 at 2:10 AM
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