919 Front Rotor Life - Wrist Twisters
 
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post #1 of 16 Old 08-09-2013, 03:53 AM Thread Starter
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919 Front Rotor Life

I feel like I'm blazing through rotors on this thing; what kind of miles are people getting with their stock Honda front rotors on their bikes?

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post #2 of 16 Old 08-09-2013, 04:12 AM
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60K and counting on the rotors. Getting 30K+ out of pads.

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post #3 of 16 Old 08-09-2013, 04:16 AM
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Are the rotors less than 3.5 mm in thickness, warped, or badly scored?
How often are changing brake pads?
Are you using aftermarket pads?
Do the wheel bearings have excessive play?

My front rotors are original at 68K +.



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post #4 of 16 Old 08-09-2013, 05:11 AM Thread Starter
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Pads are needing to be changed about every 10K or slightly less, rotors are currently at 4.1mm with about 30K on them (including on the donor bike), but were replacing a set that went below minimums at ~55K. Do not know how long they'd been on there. Not warped or scored; however, they were at 4.4mm when I put them on 10K ago. Using stock Honda pads, running fairly heavily loaded in heavy traffic. Wheel bearings are new with this set of rotors (replaced the entire wheel after overhauling bearings), no play, Koyos.

It's the rapid loss of .3mm that's concerning me.

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post #5 of 16 Old 08-09-2013, 05:54 AM
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Quote:
Originally Posted by CB700S View Post
Pads are needing to be changed about every 10K or slightly less, rotors are currently at 4.1mm with about 30K on them (including on the donor bike), but were replacing a set that went below minimums at ~55K. Do not know how long they'd been on there. Not warped or scored; however, they were at 4.4mm when I put them on 10K ago. Using stock Honda pads, running fairly heavily loaded in heavy traffic. Wheel bearings are new with this set of rotors (replaced the entire wheel after overhauling bearings), no play, Koyos.

It's the rapid loss of .3mm that's concerning me.
Do you clean the caliper pistons when you change pads? Is there any rotor drag when you spin the front wheel off the ground? Front pads at a 10K interval seems unusual for the street, but not impossible if you are heavily laden and/or are consistently hard on the binders.

I changed my front pads at 47K for the first time and 27K at the rear, but I really try to use throttle and gear selection to control entry speed into the corner coupled with lots of highway travel.

At 68,352 miles my front rotors spec out at 4.43 mm/left and 4.48 mm/right.



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post #6 of 16 Old 08-09-2013, 09:12 AM
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Quote:
Originally Posted by ST-DocLizard1 View Post
Do you clean the caliper pistons when you change pads? Is there any rotor drag when you spin the front wheel off the ground? Front pads at a 10K interval seems unusual for the street, but not impossible if you are heavily laden and/or are consistently hard on the binders.

I changed my front pads at 47K for the first time and 27K at the rear, but I really try to use throttle and gear selection to control entry speed into the corner coupled with lots of highway travel.

At 68,352 miles my front rotors spec out at 4.43 mm/left and 4.48 mm/right.

i go through front pads regularly on the 8-10k interval... strictly canyon hooning will do that.... along with rear tires every 2.5k

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post #7 of 16 Old 08-09-2013, 09:36 AM
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Quote:
Originally Posted by nd4spdbh View Post
i go through front pads regularly on the 8-10k interval... strictly canyon hooning will do that.... along with rear tires every 2.5k
It would be of interest to know what your rotors spec out at after how many miles, or if you have changed them.



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post #8 of 16 Old 08-09-2013, 04:40 PM
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Quote:
Originally Posted by ST-DocLizard1 View Post
It would be of interest to know what your rotors spec out at after how many miles, or if you have changed them.
+1, if you could take measurements at pad changes it would be very interesting.

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post #9 of 16 Old 12-02-2013, 01:07 AM Thread Starter
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So, I finally got to my next pad change, pulled the pads out and started inspecting the calipers.

Left side, not bad, should be easily cleaned:


Right side, cap wouldn't come off without use of an impact, and yeah, looks like I'm screwed because one of the caliper seals is toast:




Good thing I have those spare gold calipers sitting around, I suppose.

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post #10 of 16 Old 12-02-2013, 11:20 AM
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Holy crap! Did you lose brake fluid? I guess there are two seals in there, but I've never actually seen that happen.

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post #11 of 16 Old 12-02-2013, 11:43 AM Thread Starter
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Quote:
Originally Posted by g00gl3it View Post
Holy crap! Did you lose brake fluid? I guess there are two seals in there, but I've never actually seen that happen.
Nope, no fluid loss.

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post #12 of 16 Old 12-03-2013, 02:12 PM
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You need to clean better mister.

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post #13 of 16 Old 12-03-2013, 03:45 PM Thread Starter
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Quote:
Originally Posted by str8ghtjacket View Post
You need to clean better mister.
I cleaned them the last time I did pads. That's what's left after about 10K.

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post #14 of 16 Old 12-03-2013, 05:07 PM
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Damn that's pretty bad bro, do I need to send you the array of brushes I have? Jk man I'm a lil OCD when it come to that stuff drives my GF crazy. I need to get my caliper out and check mine since my bike is down for brake caliper swap with Morgstang, along with about 3-4 other things.

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post #15 of 16 Old 12-05-2013, 03:25 PM
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I'd say you are beyond cleaning and need to move to rebuilding. I'd go ahead and break both calipers down and clean them, get a rebuild kit and just refresh everything and drain and change the brake fluid. If it's out of your scope or something you just do not have the tools or place to work on then feel free to reach out to me. I am located in Dallas and got a garage and all the tools you would need to get it done and all the experience you would need to be helped through it. All you gotta do is let me know. It would have to be a Saturday over the next couple weeks but I am more than happy to help out a fellow Hornet owner.

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post #16 of 16 Old 12-05-2013, 06:43 PM Thread Starter
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Thanks for the offer, but as I said above, I have spare calipers I can (and will) be swapping on in the short term. Ugh, I hate gold calipers. Even ones with 10% of the miles that my black ones have (66K).

As for rebuilding - sadly, I am very familiar with rebuilding calipers and have a shop and tools of my own to do so in. Thanks again for the offer, though.

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