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
    2
    0
    0
    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
    16,845
    8,613
    0
    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
    BiomedO1 likes this.
  3. BiomedO1

    BiomedO1 Senior Member

    Joined:
    Mar 27, 2021
    4,265
    2,235
    0
    Location:
    Left Coast
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    Do you have braking issues or just too much time on your hands. Cars has been sitting out in the rain since they've been invented.

    It's your time and money; do whatever you want.
     
    #3 BiomedO1, Apr 18, 2026 at 9:34 AM
  4. Mendel Leisk

    Mendel Leisk MMX GEN III

    Joined:
    Oct 17, 2010
    61,036
    41,967
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Which look thus, all four, or?
     
    #4 Mendel Leisk, Apr 18, 2026 at 9:56 AM
(You must log in or sign up to post here.)