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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
    Moto-Uno, tobinh, GTM® and 2 others 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.
     
  9. Gazdok

    Gazdok Tuned and Synch'ed

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    Does anyone have a picture with the correct position for the spring in the rear caliper?


    CARC rear caliper_1.jpg
     
  10. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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    Do you mean like 6 pictures up above?

    Never mind, that’s my picture again.
     
  11. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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    Take a picture of your caliper and your spring and post it. You will get a reply. Pictures make everything easier if they are quality pictures.
     
  12. Gazdok

    Gazdok Tuned and Synch'ed

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    I took my rear caliper off. The spring is meant to sit in the centre I guess, but it looks like a bit is missing.... I do not know where that might have gone. Possibly corroded away as I ride through the winter on gritted and salted roads.
    P7143912.JPG

    P7143913.JPG

    The spring in your picture looks different. Is that a different version or for a completely different bike?
     
  13. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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    Yes, different bike. Just for illustration.

    The spring lifts the pad away from the caliper and provides a very smooth, low resistance surface for the pad backing plate to slide upon, it helps to provide a better pad alignment to glide along the retaining pin(s) and of course, to quell vibration noise.

    Yours, being broken in several places, no longer functions. You need to order new ones. When they are in you hand, it will become obvious how they fit in.
     
  14. Gazdok

    Gazdok Tuned and Synch'ed

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    I have just googled for the parts.
    gutsibits.co.uk/pr/TheShop/index.php?q=caliper+spring&f=d&Model=2&search=SEARCH
    The kit contains 2 springs. the brass looking one is nowhere in my caliper. Where does that one go?
     
  15. Tonym

    Tonym Tuned and Synch'ed

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    The brass looking spring goes to the front of the caliper ( the brake pads fit into it).
    You can see it in your photo looks like a small lug between "the toothbrushes"
     
  16. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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    E302CE41-DA7B-4D15-A02A-EFC9D0D38A65.png

    Left side, silver area. Look carefully and you see the tab gripping the knuckle.

    You need to THINK about what it does.

    It provides a smooth low friction surface for the pad to slide on. The pads are supported and travel along these 3 places. (2 spring plates and 1 guide pin)

    On the right , the slide pin runs through the hole in the pad backing plate.

    In the middle, the spring plate that you still have the broken piece.

    On the left, the tabs on the sides of the pad backing plates, slide in that groove and on top of the smooth, low friction, spring clip which resides over that knuckle.

    This is the best I can give you. Hopefully you finally get it now.
     
    Last edited: Jul 16, 2021
    john zibell likes this.
  17. Gazdok

    Gazdok Tuned and Synch'ed

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    Eventually I got a nice new shiney spring. The rear wheel suddenly runs wonderfully smooth, i.e. no scraping of the pads on the disc.

    For UK owners - this part seems on a back order with a few weeks wait, but BMW use / sell exactly the same part for some of their bikes with 1-day orders and it is cheaper than Moto Guzzi's. The BMW PN is: 34217671876.
     
    john zibell likes this.
  18. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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    You’re welcome.
     

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