2010 Prius uneven rotor wear and brake codes

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Jibtron, Feb 27, 2025.

  1. Jibtron

    Jibtron New Member

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    200k miles, the drivers side rear rotor has only a narrow contact point with the brake pads and the rest of the rotor is rusty. All other rotors are clean. I am getting traction control light, brake light, abs light. DTCs of C0210, C1238, C1214. I know that they are for speed sensors and master cylinder. The pressure behind the brake pedal feels good and the fluid level is not diminishing. I replaced the speed sensors, or at least the wires leading to them, I am not really sure if the actual sensor is inside the hub or at the end of that wire. The brakes seems to be performing well so I am hoping it is not master cylinder.

    Main question is: is the uneven brake pad pressure possibly causing these codes? How can i get that brake functioning properly? What is the best way to find the actual problem?
     

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    #1 Jibtron, Feb 27, 2025
  2. Brian1954

    Brian1954 Senior Member

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    You wrote that the picture is "driver's side rear rotor", which would be the left rear. Trouble codes C0210 and C1238 are for the right side rear speed sensor. So it appears that you have two separate issues to fix.

    Trouble code C1214 is " Hydraulic Control System Malfunction ". Possible trouble areas are:
    1. Bake fluid leaks.
    2. Brake disc rotor excessive wear.
    3. Brake booster with master cylinder (Brake actuator).

    When was the last time work was done on the rear brakes? Where the brake pads replaced at that time?
     
    #2 Brian1954, Feb 28, 2025
    Last edited: Feb 28, 2025
  3. Mendel Leisk

    Mendel Leisk Senior Member

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    The uneven rotor wear is very likely due to misaligned caliper piston. More info in the rear brake drag link in my signature (on a phone turn it landscape to see signatures).
     
    #3 Mendel Leisk, Feb 28, 2025
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  4. Tombukt2

    Tombukt2 Senior Member

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    Soon as you pull the caliper off and the caliper bracket and the rotor because that rotors coming off you'll get new ones and then you'll see the slides or something are not operating properly you should be missing most of the brake pad at least the one we're looking with the narrow contact facing us that ought to be quite good stuff no brakes should ever look like that that is horrible but they do so there's always that pull the mess apart and take a picture of the junk that's laying on the ground after you have it all off the car and laying on the ground You should be able to clearly see what needs to be done but apparently that is a gift and many people may not have it I don't know to me it's just common sense but anyway once you have the parts laid out and on the floor it's pretty much a no-brainer You don't have to buy all that stuff at the Toyota dealer it's all marketed by everybody now there's none of this stuff is new enough to worry about no cutting edge about any of this at all and yes the sensor for the electronics is built into the rear hub so if it's messed up in the hub you're getting a new rear bearing that's how you get the sensor The fronts are individual and stuck into the big piece of aluminum and read a tone ring through a slot the rear not so much.
     
    #4 Tombukt2, Feb 28, 2025
  5. Jibtron

    Jibtron New Member

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    I think 2018 I did the rear pads and both rotors. I think it was pulling a little uneven back then but not this badly. There is still a good amount of pad left on both sides.
     
    #5 Jibtron, Mar 1, 2025
  6. Jibtron

    Jibtron New Member

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    Will do, thank you for the advice!!
     
    #6 Jibtron, Mar 1, 2025
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  7. Jibtron

    Jibtron New Member

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    I just replaced rear pads and rotors. I also got the caliper pistons aligned properly like Mendel recommended. I still have Traction control, abs, and brake lights on the dash with only mechanical braking. The only DTC now showing is c0210. I replaced the wire that connects to the speed sensor but the code and dash lights are still present. Do you have any ideas on what i should do next?

    I am reading about scanners that can read "detail codes" or "inf codes" that might further diagnose the issue with the sensor but I don't know if i can do that with my scanner/app. I have a cheap veepeak vp11 obd2 scanner and am using an app called "car scanner"
     
    #7 Jibtron, Mar 10, 2025 at 6:05 PM
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