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Is bleeding the stroke simulator the same as ABS air bleed?

Discussion in 'Gen 3 Prius Technical Discussion' started by Seymour1, Jul 5, 2024 at 8:43 PM.

  1. Seymour1

    Seymour1 Junior Member

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    Maybe it is too many terms meaning the same. Is linear valve offset the same as zero point calibration?
     
  2. ChapmanF

    ChapmanF Senior Member

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    Techstream has a menu with two different bleed procedures. One is shorter, and appropriate when the only work that has been done is at the wheel ends of the brake lines. The other is more thorough, and has to be used if the underhood brake components have been replaces or their connections opened.

    The more-thorough one is called 'ABS actuator has been replaced" on the Techstream menu. (If you are using some other scan tool, it's called whatever that scan tool calls it.)

    That longer bleed procedure will guide you through several steps. Bleeding the stroke simulator will be one of those steps.

    The bleed screw on the stroke simulator is only accessible with the windshield wipers and cowl removed, so it is good to remove those before starting the whole bleed procedure, so you aren't slowed down mid-procedure by having to do that.

    Linear solenoid offset learning is its own thing. It normally happens automagically at the end of the long-form bleeding process, but sometimes it won't 'learn' on the first try, and then there will be a C1345 code saying you have to do it over. There is a procedure to request just the linear solenoid offset learning by itself.

    "Zero point calibration" is ambiguous. There are several things in the car that have zero points that can be calibrated. In the brake / ABS / skid control system, there's a pedal stroke sensor zero point, a yaw rate and acceleration sensor zero point, and a steering angle sensor zero point. The steering angle zero point gets found automagically, as long as the yaw sensor zero point is calibrated right and the wheel speed sensors are ok.

    On the other hand, if you have the parking assist feature, that has its own steering angle sensor zero point calibration that isn't automagic.