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Rear brakes locking up

Discussion in 'Cal 1400 8V' started by Matt Russell, Jun 10, 2021.

  1. Matt Russell

    Matt Russell Just got it firing!

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    Any idea what would cause them to lock up. Initially I thought there might be an issue with the transmission, several times this week I have had to rock the bike back and forth a few times to be able to move it that was my thought until today when riding back home it happened again and this time while riding, I got home and realized the brake pads almost gone and well over heated. I am going to take it to the shop in a couple of weeks to get it fixed but any idea why they would lock up
     
  2. BrianR

    BrianR Cruisin' Guzzisti GT Famiglia

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    It could be debris between the foot lever and the hanger, preventing the lever from returning or the return spring broken, or the pivot being corroded, or the slider pins all rusted up or the pistons being corroded. Have you dropped the bike on that side? It could be numerous things and smarter people than me will suggest other options. Take a picture of the caliper from underneath and from the side as well as the disc and the lever with spring and pivot bolt. That would all help.
    PS, what does your avatar stand for?
     
  3. Matt Russell

    Matt Russell Just got it firing!

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    Bikes never been dropped, I plan on spraying some penetrating oil in the morning around the lever. You might be right on that when I tapped the rear a few times it freed itself. As for the avatar 9 12 = I L our colors are white and gold, the center is the Hellfire 8
     
  4. sir fred

    sir fred Cruisin' Guzzisti

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    I had the same problem.
    The rear brake would drag and overheat the caliper. I checked out any debris that might affect the pedal. I sprayed WD40 on to the cylinder plunger..Took the brakes apart , lubed the guide pins, bled the brake, made a heat shield for the master cylinder...still occurred.

    I found a reply on a forum where the writer told of this being a problem on a BMW he once had.
    He said the caliper cups were cocking as the pads wore.

    I took the pads out. Cleaned the caliper. Pressed the caliper cups in all the way and replaced with new pads.
    No problem since and I will change the rear pads more frequently now. Probably every other rear tire change or 12k miles. Even if the pads look good.
    I am just about ready for a new tire.25k miles on bike.
    I use Avon V91/92 tires. getting about 7k/rear tire now. They are lasting longer than the previous V71/72s.
     
  5. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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    Must be the season...

    This is related to your question:

    https://www.guzzitech.com/forums/threads/rear-brake.21541/#post-173119

    Also, as a matter of courtesy, always state the year, and model of your motorcycle that you are asking questions about. The current mileage is also very helpful.

    I would guess that either your pistons are corroded and not retracting fully, or the brake fluid reservoir is too full, thereby not allowing the excess fluid to return to the reservoir and release the pressure on the pads themselves.

    Do not continue to ride the bike like this. It is completely unsafe until you discover why the brakes are refusing to release.

    Photos are always very helpful as well. I am concerned that you have glazed the pads from extreme heat and maybe even warped your rear rotor. If after resolving this issue, you feel pulsing at the pedal when applying the brake, you will know that you warped the rotor for sure.
     
    Moto-Uno likes this.
  6. Matt Russell

    Matt Russell Just got it firing!

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    I didn't think about that but that would explain exactly why rocking the bike would free them.
     

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