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Thread: 1987 K75C 19K Front brake rotor replacement question

  1. #1
    PeteG
    Join Date
    Dec 2009
    Location
    Woodacre, California
    Posts
    123

    Smile 1987 K75C 19K Front brake rotor replacement question

    My virgin attempt at replacing front brake rotors and am currently reviewing the procedure which seems pretty straightforward.

    Clymer instructions state in several places that rotor mounting nuts are on the right side and allen bolt heads are on the left side.

    My 1988 and 1987 K75Cs have the exact opposite (bolts going in on the right and nuts on the left). Looking at K75Cs on Google images also shows bolts on right side and nuts on left.

    I guess my question is two part; Does it matter which side bolts and nuts go? Is this just a Clymer mistake?

    I'm getting new nuts and noticed that they changed style from self-locking nyloc nuts to deformed or distorted thread nuts. I'm assuming the distorted thread nuts will not destroy the bolt threads since there is no warning in the parts fiche.

    Thanks in advance,
    pete

  2. #2
    3 Red Bricks
    Join Date
    Jan 2007
    Location
    Pleasanton, Ca.
    Posts
    4,760
    Doesn't matter.

    Won't hurt the bolts.



    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

  3. #3
    PeteG
    Join Date
    Dec 2009
    Location
    Woodacre, California
    Posts
    123
    Quote Originally Posted by 98lee View Post
    Doesn't matter.

    Won't hurt the bolts.



    Thanks again Lee!

    pete

  4. #4
    PeteG
    Join Date
    Dec 2009
    Location
    Woodacre, California
    Posts
    123
    Just as an update.

    One of my rotors was badly distorted with over .030" run-out. I had a low speed run-off-road event that flipped me off the bike. The only damage was to the side case which cracked and has since been patched. I was unharmed (except for my pride because of faulty situational bias decision making). I didn't notice any brake pulsing after getting on my way from the "event". The pulsing was noticed a few months later and the run-out was only on the right front rotor.

    Installed two used rotors (.166" thickness) with new distorted nuts torqued to spec. Spun the wheel without calipers and couldn't see any run-out.

    Brakes performed perfectly on my test run. I will remain cautious until pads are broken in.

    I had reservations about buying used rotors but it appears to be unfounded. Cost was $200 for a pair.

    Thanks again Lee for the input and getting me over the hump to feel comfortable taking on the task.

    pete

  5. #5
    3 Red Bricks
    Join Date
    Jan 2007
    Location
    Pleasanton, Ca.
    Posts
    4,760




    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

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