BMW R100GS & R100, bolt on Brembo 4 Piston Caliper Upgrade

Discussion in 'Vendors' started by One Less Harley, Oct 10, 2010.

  1. chlowden

    chlowden Adventurer

    Joined:
    Feb 11, 2019
    Oddometer:
    13
    Location:
    Paris
    Thank you for the confirmation
  2. chlowden

    chlowden Adventurer

    Joined:
    Feb 11, 2019
    Oddometer:
    13
    Location:
    Paris
    I have made the modification using a R1100GS caliper and the brembo PS13 master cylinder. I have purged the system completely, set he brake lever screw as far possible, but I am getting a very soft lever action with the lever touching the handle bar. The caliper has been completely rebuilt and I don't have any leaks. Would anyone have any other suggestions? Many thanks
  3. windypoint

    windypoint Been here awhile

    Joined:
    Feb 4, 2012
    Oddometer:
    718
    Location:
    Walla Walla
    Sure sounds like air in the system to me.
  4. chlowden

    chlowden Adventurer

    Joined:
    Feb 11, 2019
    Oddometer:
    13
    Location:
    Paris
    I have had 2 different mechanics drain the system with the same result. They both said that I need a bigger master cylinder, maybe a 15mm but I am not so convinced.
  5. windypoint

    windypoint Been here awhile

    Joined:
    Feb 4, 2012
    Oddometer:
    718
    Location:
    Walla Walla
    I had a hard time getting air the air out. After force bleeding from the bottom, I wire tied the brake handle to the grip and let it set over night. Next day all was good and firm.
  6. chlowden

    chlowden Adventurer

    Joined:
    Feb 11, 2019
    Oddometer:
    13
    Location:
    Paris
    After 24 hours of having the lever cable tied to the hand grip, I have tangibly better result. I have not tried to lock up the front wheel as it has been raining these last few days, but I am confident that I have a safe braking system. So thank you so much for this simple suggestion. In the end, it is a real time saver.
    windypoint likes this.
  7. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

    Joined:
    Nov 16, 2006
    Oddometer:
    6,643
    Location:
    Bowling Green, Ky
    4/19/2019- I have one set with pads on hand.
  8. gordongraham

    gordongraham Been here awhile

    Joined:
    May 13, 2013
    Oddometer:
    384
    Location:
    East Wemyss, Fife, Scotland, UK
    what thickness of material needs milled off the mounting tab? I have a couple of spare 1100 calipers here (in Scotland) and would like to mod one to fit my r100gs
  9. Goomicoo

    Goomicoo Rubber Cow

    Joined:
    Nov 4, 2010
    Oddometer:
    950
    Location:
    Here & There
    On my R80ST I left 8.5 MM on the tabs and milled the mounting side of the tab. (the side contacting the fork)
  10. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

    Joined:
    Nov 16, 2006
    Oddometer:
    6,643
    Location:
    Bowling Green, Ky
    the ST is a completely different animal....not really the subject of this post.
  11. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

    Joined:
    Nov 16, 2006
    Oddometer:
    6,643
    Location:
    Bowling Green, Ky
    sent you the info
  12. gordongraham

    gordongraham Been here awhile

    Joined:
    May 13, 2013
    Oddometer:
    384
    Location:
    East Wemyss, Fife, Scotland, UK
    thanks OLH
  13. pfestus1

    pfestus1 Slash 5er

    Joined:
    Dec 4, 2001
    Oddometer:
    748
    Location:
    Roanoke , Virginia
    One Less,
    can you hook me up with a 4 pot caliper? I recently bought a 1992 R100GSPD. Can you supply the stainless brake line also? Thanks
  14. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

    Joined:
    Nov 16, 2006
    Oddometer:
    6,643
    Location:
    Bowling Green, Ky
    No lines on hand but can get them...banjo fitting at MC? Stock length?? Silver or black color? Do you want pads?. I have two calipers but they need to be machined. PM me
  15. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

    Joined:
    Nov 16, 2006
    Oddometer:
    6,643
    Location:
    Bowling Green, Ky
    7/26/2019- I have one set of calipers with pads on hand. If needed I can get a braided line in about 1 week.
  16. pfestus1

    pfestus1 Slash 5er

    Joined:
    Dec 4, 2001
    Oddometer:
    748
    Location:
    Roanoke , Virginia
    THANKS One Less Harley! I got my 4 pot Brembo and new brake line installed and bled today. Process went well. No bleeding issues. Prior to starting the install I performed an unscientific test so I could compare stock setup with the new caliper. On the street in front of my house I rode the GSPD at 25 mph, and at a crack across the street I braked hard with just the front brake. Bike stopped in about 22 feet. Then after the install I re-enacted the test. This time the bike stopped in about 20.5 feet. Brake feel is much more solid. My guess is about 35% better braking. I feel it is definitely worth doing. Brembo 4 pot.jpg
    windypoint likes this.
  17. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

    Joined:
    Nov 16, 2006
    Oddometer:
    6,643
    Location:
    Bowling Green, Ky
    thanks for the evaluation, should preform better once pads bed in....
  18. bykpimp

    bykpimp Live and let ride

    Joined:
    Oct 18, 2006
    Oddometer:
    1,439
    Location:
    Santa Cruz Ca
    Caliper and pads wanted 92 R100GSPD
  19. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

    Joined:
    Nov 16, 2006
    Oddometer:
    6,643
    Location:
    Bowling Green, Ky
    8/28/2019-None left, but three available soon....
    bykpimp likes this.
  20. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

    Joined:
    Nov 16, 2006
    Oddometer:
    6,643
    Location:
    Bowling Green, Ky
    pfestus1 likes this.