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Thread: Front brake drag

  1. #1
    apriliaforum newb
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    Front brake drag

    Hey,
    My 2017 Factory has a heck of a lot of front caliper drag. As in I barely get 1/4 rotation when spinning the wheel with quite a bit of force. I can feel the difference between the tuono and my other bikes when moving them around in the garage.
    I've tried the usual tricks -

    Making sure the fork legs are aligned by loosening the left side after tightening the nut and bouncing the suspension.
    Holding the brake lever whilst tightening the caliper bolts to help ensure the caliper is aligned.

    Still too much drag.

    Is this something that is common to these bikes?

    Any other suggestions?

    Thanks in advance,

    RobertVP
    2017 Tuono Factory
    2017 Ducati SuperSport S
    2014 BMW R9T
    2011 BMW S1000RR
    2005 Ducati ST4S

  2. #2
    apriliaforum expert Birky_D's Avatar
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    Quote Originally Posted by RobertVP View Post
    Hey,
    My 2017 Factory has a heck of a lot of front caliper drag. As in I barely get 1/4 rotation when spinning the wheel with quite a bit of force. I can feel the difference between the tuono and my other bikes when moving them around in the garage.
    I've tried the usual tricks -

    Making sure the fork legs are aligned by loosening the left side after tightening the nut and bouncing the suspension.
    Holding the brake lever whilst tightening the caliper bolts to help ensure the caliper is aligned.

    Still too much drag.

    Is this something that is common to these bikes?

    Any other suggestions?

    Thanks in advance,

    RobertVP
    Have you recently had the wheel out and changed the tyre?

    Sent from my G8141 using Tapatalk
    Motocrosser from 1993-1999 & 2009-2014

    Now just a road & track rider supporting my son in his racing

    Follow me on YouTube for old races of me, current road and track racing & my son competing

    https://www.youtube.com/c/DeanBirkumshaw

  3. #3
    apriliaforum expert wrx_02's Avatar
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    Stuck Caliper piston
    Too much fluid in the brake system
    Fork legs are in a bind (stiction)
    CMRA

    Sidi Boots
    Motonation
    Vesrah Brakes
    BD Racing
    Dunlop
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    North Texas Superbikes


    1964 Vespa:
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    2008 Yamaha R6 #728

  4. #4
    apriliaforum newb
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    I should have mentioned that the bike only has 2,000km (~1,250 miles). I need to change the front pads and will ensure the pistons aren't stuck - but I think since the bike is so new that is unlikely?
    Most of the miles have been on the track. Tires changed 3 times so far. I've noticed it each time I've changed the tires.
    Suspension works well, I went through the procedure to make sure it isn't binding - loosen the pinch bolts on one side, bounces, retighten.
    I'll check the fluid level - didn't consider that it could be so high that it was pressurizing the system - but you never know.

    So this isn't 'normal' for these bikes? I was thinking maybe the ABS system creates a little drag??

    Thanks very much for the quick replies.

    RobertVP
    2017 Tuono Factory
    2017 Ducati SuperSport S
    2014 BMW R9T
    2011 BMW S1000RR
    2005 Ducati ST4S

  5. #5
    apriliaforum expert Birky_D's Avatar
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    OK the loosening pinch bolts and making sure forks were free was the bit I was going to get at

    The fact you've done that many track days I'd say it's just the pads and discs

    Mine is a 16 so has the older m432 setup (I think that's its name) and had to change the master to an rcs19, decent pads, high grade oil and in the last week upgrade the rotas due to warping two sets of oems, the first being done under warranty but second declined

    They are exceptional bikes but the standard brakes in my opinion are good for fast road and the odd mid pack fast pace track day. If you go much more you start getting issues like you are describing

    Others may have a very different view but I know I experienced similar

    Sent from my G8141 using Tapatalk
    Motocrosser from 1993-1999 & 2009-2014

    Now just a road & track rider supporting my son in his racing

    Follow me on YouTube for old races of me, current road and track racing & my son competing

    https://www.youtube.com/c/DeanBirkumshaw

  6. #6
    apriliaforum expert wrx_02's Avatar
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    I wouldn't think it to be normal for any bike.
    Piston could only be stuck if they are all gunked up. Some pads put off a lot of brake dust, even more when track riding.
    I also fill my system a little above half on any of my race bikes. I don't have an RSV4 but I do this because fluid will expand a little depending on your track pace.
    If it if full it could be fine until it expands some.

    If you need new pads I would go ahead and clean the calipers with some mild soap and warm water. Use a tooth brush to get the dust and gunk off the pistons, if there is any.
    You may need to turn the pistons depending on the design. MSR makes a caliper piston tool to help turn them without removing them. If you remove them you have to get seals and rebuild them so be careful. More than likely it is how the wheel is being tightened. I would go through the procedure step by step and spin the wheel between each change. Then you can rule out the each issue as you go through and tighten everything.
    CMRA

    Sidi Boots
    Motonation
    Vesrah Brakes
    BD Racing
    Dunlop
    Race Tire Services
    Lucas Oil
    Vortex Racing
    Shorai Batteries
    North Texas Superbikes


    1964 Vespa:
    133c/4spd conversion
    2008 Yamaha R6 #728

  7. #7
    apriliaforum expert wrx_02's Avatar
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    You could have a warped or bent rotor/carrier also.
    Some guys are not careful when they change your tires and will bend them if they are not careful.
    You will need a dial indicator to check them and most are expensive. If they were bent by someone and not just out of spec, then you can usually check them by removing the calipers, pinch bolts and get the wheel spinning freely. Then just stare at the rotor head on and spin the wheel. If you can see it really wobble, they are out of spec.
    CMRA

    Sidi Boots
    Motonation
    Vesrah Brakes
    BD Racing
    Dunlop
    Race Tire Services
    Lucas Oil
    Vortex Racing
    Shorai Batteries
    North Texas Superbikes


    1964 Vespa:
    133c/4spd conversion
    2008 Yamaha R6 #728

  8. #8
    apriliaforum Junkie Handy Rodder's Avatar
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    Loosen caliper bolts
    sqeeze the brake lever while tightening the caliper bolts. Make sure wheel spins freely.
    i also would check rubber boot in master cyclinder and make sure its in the accoridan position not stretched out.
    13 Tuono
    08 CRF450R
    06 K1200R
    03 YZ450F
    02 GSXR-1K
    96 CBR900
    86 Fazer 700

  9. #9
    apriliaforum newb
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    Thanks guys,
    I'll be checking all that has been mentioned.
    RobertVP
    2017 Tuono Factory
    2017 Ducati SuperSport S
    2014 BMW R9T
    2011 BMW S1000RR
    2005 Ducati ST4S

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