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Rear brake.

Discussion in 'CARC' started by Chris Wilson, Jun 9, 2021.

  1. Chris Wilson

    Chris Wilson Tuned and Synch'ed

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    What, if anything can be done to improve the biting power of the rear risk brake on a CARC rear end.
    I am using HH pads but it seems to me that the rear foot lever is too short and even on a mild down hill park I have to stand on the lever in order to stop the bike rolling.
    Annoying and the front brake gets used below walking pace where it shouldn't be used.
    Chris.
     
  2. Raven

    Raven High Miler GT Famiglia

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    Sounds like a problem with the rear brake master cylinder. The rear wheel should lock or the ABS kick in with not much more than a firm press.
     
  3. Chris Wilson

    Chris Wilson Tuned and Synch'ed

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    No ABS on a Bellagio but come to think of it perhaps it's the sliding head caliper not sliding and only using one side.
     
  4. Fiat500

    Fiat500 Cruisin' Guzzisti

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    The rear brake on my 1200 Sport was over sensitive and would lock up very easily when solo. Changed out pads to an after market set and now have much better feel.
     
  5. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    Possibly the caliper not sliding. Also bleed the system just in case there is a bit of air in there.
     
    tobinh likes this.
  6. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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    You have something binding and/or air in your brake line and/or a weak master cylinder piston. They should feel rock solid and work with minimal effort.

    I habitually see corroded guide pins. Invariably, if the pins are corroded, then the pistons are too. Both can be easily cleaned and renewed with some brake cleaner and a triple 000 steel wool pad. Be sure to blow all of the metal dust off of the pistons and caliper and use a brake grease to lubricate the pins. I use silicon spray lubricant on the pistons and wipe off the excess with a clean rag.

    NOTE: These are not Moto Guzzi calipers but the condition of the guide pins and pistons are what we are looking at.

    4E4C0A5F-86A7-4BCD-88BB-B5134FA77A9F.jpeg 38A57BDA-0CDA-4FD9-A3F2-B539BAB2691D.jpeg 3B2C6209-300F-4086-8647-B2BD4A9FE4D7.jpeg

    C99C34B1-3BFE-41A5-A108-2379A2E5AE9D.jpeg

    BC43BD7D-75C1-481F-BB5E-E664D874C845.jpeg

    D8B1A46B-1E0A-40A4-907F-17B1D7C2770B.jpeg
     
    Last edited: Jun 10, 2021 at 7:30 AM
    tobinh, GTM®, BrianR and 1 other person like this.
  7. BrianR

    BrianR Cruisin' Guzzisti GT Famiglia

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    An afternoon is well spent looking at brakes, cleaning pistons and the sliding pins. As Scott shows with his pictures, even the cleanest calipers can have parts that need light cleaning.
     
    tobinh likes this.
  8. Chris Wilson

    Chris Wilson Tuned and Synch'ed

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    Thanks for the replies
    guys, something is not right as it is worst than a drum brake on a Honda 90.
    Bought the bike second hand after is was stored for about 4 years in a garage.
    No signs of rust or corrosion elsewhere but the pins and pistons indeed would be worthy of a look see.
    Cheers, Chris.
     

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