Front Brake Caliper guide pin play?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by SouthernFarm, Dec 21, 2019.

  1. SouthernFarm

    SouthernFarm New Member

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    2006 Prius
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    Hello all, first post but have followed and used this site many of times with the two used gen 2 prius's I have owned over last 3 years.

    My 2006 prius has had uneven tread wear on left front tire. No pulsing brakes. No wheel bearing growl. Alignment done a year ago at toyota. With slow movement, like 10 MPH I have a whole body sway/rocking feeling. Like rear tire is off set. Checked torqued all lugs. Vehicle on jack stands and spun all wheels. No wobble. Only other symptom is in a slow roll steering will grab slightly and pull to right in pulsitile fashion, indicating brake grab on right front. Ball joints and tie rods seem tight.

    About to put on new brake pads and rotors. Guide pins were cleaned and lubed about a year ago and new dust boots installed by me.
    I did notice once I had the wheels off, and re-attached a couple of lug nuts to secure the rotors, that there was a slight brake grab to the right front. So I am on the right track.

    Big question. The brake caliper guide pins, slide in and out nicely. Boots intact. Do the guide pins have any play in them? I have a notice of a bit of a wiggle in them, or are they supposed to be only in and out movement? I noticed that my pins have a flat part on them, but they don't fit into any sort of guide inside the bracket. I can rotate them around 360 no problem. Has there been some sort of damage/wear to the bracket?

    Thanks in advance.
    Brian
     
  2. cnc97

    cnc97 Senior Member

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    As long as you have free movement of the pins, I would not suspect any issue there. I would look at the condition of the rubber brake hoses. They may look ok on the outside, but the inside tends to break down. This causes the hose to act like a “one way” valve. I’d change both hoses simply due to the age of the car. People tend to think the rubber hoses last forever, and that is not the case.
     
    #2 cnc97, Dec 21, 2019
    Last edited: Dec 21, 2019
  3. vvillovv

    vvillovv Active Member

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    welcome to PC
    I haven't done any brake work for longer than you've had a look at yours and none yet on a prii. So I'll try not to give any suggestions about the slide pin thing or the uneven wear. Hoping one or two of the experienced gen2 3 members will see this and comment.

    One thing I think will help, describe the uneven wear issue. which wheel(s), which tire surface(s),
    and how long you've noticed the slight pull to the right. Did the pull start before the alignment? Did you get the alignment for an issue you noticed or on a mechanics recommendation and where was the work done if you feel like adding that info.

    Great question and best of luck.
    I found this thread from your other post in Intro new.
     
  4. ChapmanF

    ChapmanF Senior Member

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    The slide pins aren't subject to very high forces: the forces of braking go directly from the pad edges to the beefy caliper mounting bracket, which is solidly bolted to the knuckle. The guide pins are basically there to make sure the caliper stays with the car when you go places. As long as they move freely, slight play in them is of no concern.
     
    vvillovv likes this.
  5. SouthernFarm

    SouthernFarm New Member

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    2006 Prius
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    N/A
    Thanks for the guide pin info. As for tire wear, it is outside left tire in one spot or area of tire. Not ALL the way round. Like a toe in/out or camber off. Right tire fine, but pulls to right. Noticed last spring and alignment done previous summer/fall. Last winter was fine. No accidents or hits. The alignment done because of toe in wear on outer sides of both tires when was purchased used. Done at local Toyota dealership. Did have pre and post numbers given to me. Main reason for alignment though was I installed new shocks and springs all around.
     
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