Frankenbrakes and brake improvement discussion

Discussion in 'Downhill & Freeride' started by Udi, Sep 2, 2015.

  1. Electric_City

    Electric_City The orangutans are loose!

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    Ahhhh, the "Avid squeal". I was unaware that Avid made bmx rim brakes!

    I thought Avid/Sram patented that sound like Harley patented theirs?
     

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  2. Udi

    Udi RM Chief Ornithologist: “I Brake for Birds”

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    @Sandwich don't get those, good thing you asked actually. They expand under lever pressure and quite hard to get a firm bleed (even though they claim they're stiffer, they're not). Just get any normal black hose - Formula, or any Avid/SRAM with the same fittings - most Juicy ones work.

    @Happymtb.fr It's my friend, he's (much) faster on a DH bike. ;)
     
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  3. Sandwich

    Sandwich just shake your rump
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  4. Udi

    Udi RM Chief Ornithologist: “I Brake for Birds”

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    Oh right, so you just wanted the kevlar ones coz not black?
    Yeah that'll work to my knowledge (assuming the fittings look visually the same as yours).
    White hoses are hideous though, I'd just rock one black until you have an excuse to get the other too.
    Plus that way it doesn't look like you picked white on purpose.
     
  5. Sandwich

    Sandwich just shake your rump
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    I picked that one because it was cheap and available, which is not a recurring theme for formula in MERICA. don't care about Kevlar, but matched is better than totally goofy looking, though I agree with you on white v black.

    Thanks for the tip though, need to debate Shimano or alternatives...
     
  6. chris_f

    chris_f Chimp

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    So my new, shiny, gorgeous Magura MT7s have developed an issue after 3 rides. LMAO

    Pistons on one side on the front brake are sticking, so basically what happens is that under hard braking, the pistons on the other side pushes the disc into the caliper, making a loud "clack-clack-clack"-esque sound, and I can feel the vibrations through the levers. Brake power also suffers noticeably while this happens.

    It might be a warranty issue, so I'm not really up for tampering too much with them, but does anyone have any suggestions?
     
  7. Happymtb.fr

    Happymtb.fr Monkey

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    I would suggest that you massage your pistons on the lazy side.

    To do so, remove the pads, block the moving pistons in a creative way and actuate the brake lever until the lazy pistons stick quite far out, then push them back and repeat a few times. This should lubricate the pistons and the seals and thus allow them to move evenly with the other side.
     
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  8. chris_f

    chris_f Chimp

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    Thanks, I'll give that a go today.
     
  9. Udi

    Udi RM Chief Ornithologist: “I Brake for Birds”

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    "clack-clack-clack" means "switch to enduro" (i.e. DH @ 2/3 pace) in lizard speak.
    MT7 calipers are supposed to be great, clearly user error.

    Also, this.
     
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  10. Bike078

    Bike078 Monkey

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    It looks like you were right about my m615 deore @Udi. Despite cleaning and bleeding the rear brake still tends to lock up under extended braking. I will be replacing it with my old slx m665.
     
  11. spocomptonrider

    spocomptonrider sportin' the CROCS

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    If this doesn’t work I would also suggest (with the bike in a stand) rotating the lever so it sits level and opening the bleed port, then press the pistons so they are fully retracted into the caliper, once this is done top off the mc with mineral oil give it a few taps and then replace the bleed cover. I was having issues with piston stick as well and this seems to have solved it for me.
     
  12. Sandwich

    Sandwich just shake your rump
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    Hey @Udi , can I run saint brake hoses on XT calipers? Is there any difference in the brake lines?
     
  13. 6thElement

    6thElement Turbo Monkey

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    So the Saints on my wifes DH bike have sat since Sept/Oct and currently seem to have less stopping power than Fred Flintstoning it...

    Thoughts? Is it likely the calipers have contaminated the pads and nuking the pads or fresh pads should solve it for now?

    Levers aren't squishy and only a few bubbles came out with the funnel attached.
     
  14. Nick

    Nick My name is Nick

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    behind you, don't wait up.
    a few hot laps might heat them up and fix everything :thumb:

    or, fix nothing and you have a high-speed out of control wife :thumbsdown:

    I'm helping.
     
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  15. 6thElement

    6thElement Turbo Monkey

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    Swapped the rear pads for the only spare set I had, will have to find some more for the front before the weekend.

    If I need some Shimano juice can I come steal some?

    Anyone want to swap two sets of finned XT for a set of Saint?
     
    #735 -   May 22, 2018 at 8:04 PM
    Last edited: May 22, 2018 at 8:11 PM
  16. Nick

    Nick My name is Nick

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    behind you, don't wait up.
    of course on the juice, and I'll check the stash for pads too.
    where are you two DH'ing this weekend?
     
  17. Jm_

    Jm_ Turbo Monkey

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    Standard fix, pads in oven at 400 for 20, wipe rotors down with 99% rubbing alcohol.
     
  18. 6thElement

    6thElement Turbo Monkey

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    Granby Ranch, free day on our mtbparks pass as a warmup before Winter Park and Keystone get going.
     
  19. slyfink

    slyfink Turbo Monkey

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    Vital having trouble with the Magura MT Trail carbons?
    (Maybe a 2-pot caliper is undersized for a bike of that heft?)
     
  20. slimshady

    slimshady Turbo Monkey

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    That has nothing to do with it being 2-pot, but with a stupid design decision by Magura. Their MCs have a venting hole in the handlebar clamp area, and given enough time the diaphragm blocking it will start letting air into the circuit. Down here, where spare parts are scarce, most of the guys opt for either selling them and buying Shimano (only to land in the same boat with regards of leaky MCs) or plugging the venting hole with some silicone glue.
     
  21. StiHacka

    StiHacka Compensating for something

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    i͓̽t͓̽ i͓̽s͓̽ fu͓̽l͓̽l͓̽ o͓̽f s͓̽t͓̽a͓̽r͓̽s͓̽
    Next time, make them try Shimano levers.