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Discussion Starter #1
Hey all,

i asked this question earlier as part of my introduction post, but i figured i'd make an actual post in this section to have a more on topic conversation.

I purchased my '17 FZ 09 this weekend, and everything was awesome on my ride home (about 200kms). Last night i went out for a short ride and started to feel the front brakes pulsing when coming to a stop as if the rotors were warped. Same feeling as a warped mountain bike rotor if anyone knows how that feels?

Some members said to check the bobbins on the rotor, though im unsure what im looking for. Should there be any movement/play in the rotors/bobbins? they all felt 100% tight with no movement at all when i checked them this morning before heading out for work. (i compared them to my ER6N and they felt the same)

It would seem odd for the rotor to be warped if they felt perfectly fine on the ride long ride home. I don't have a stand to prop up the front wheel to spin and check for true-ness, so unsure of any other ideas there.

My next idea is to take off the caliper and clean/scuff up the pads and rotors and see if that changes anything.

Any other info would be great! thanks!
 

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Where are you feeling the pulsing?
Is it through the entire bike, in which case I’d ask how you know it’s the front not rear.
Or is in in the lever?
Assume it’s not the feeling of the ABS kicking in?


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Discussion Starter #3
its causing the whole bike to pulse forward and backwards as i come to a stop, as if the brake is grabbing harder and softer. It happens when i use front only so i know it must be the front. I assume soft-medium braking coming to a stop shouldnt be engaging the ABS? never felt this on my ER6N ABS
 

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Correct if it’s a properly functioning ABS.
The sensor on the wheel is pretty sensitive to bending. Do you feel any level of pulsing in the brake lever? I’m not saying this is the problem, just a potential.




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Discussion Starter #5
Correct if it’s a properly functioning ABS.
The sensor on the wheel is pretty sensitive to bending. Do you feel any level of pulsing in the brake lever? I’m not saying this is the problem, just a potential.




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Thinking now I cant remember..id have to take it out for a test, but I dont think so. mostly just in the bike/fork compressing. but its felt throughout the whole bike so i probably feel it to some degree in the bars/lever.
 

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Could be a warped rotor but also could be some glazing on the rotors (my sons 701 suffered the same problem). It is possible the previous owner has used something to clean the bike that has affected the rotor surface. I would definitely give the rotors a clean with brake clean and steelo before spending any money. Also check the front wheel is properly mounted. loosen the front axle bolts including the pinch bolts, then tighten the main axle bolt, then the left side pinch bolt, then very slightly tighten the right side and bounce the front suspension a bit to force the right side fork to take its correct position, then tighten the right side pinch bolt.

You could also pull the pads and give them a gentle rough up as well with 120 grit on a flat surface. You should also re-bed the pads in with some hard braking between 140-30 kmh (that is, don't actually stop).

Note, a problem with checking for warped rotors is that you could find them slightly warped and might be tempted to replace them when the slight warp was not the issue.
 

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Also check for seized rotor buttons, it should be obvious if they're rusted. If the rotors are warped, that is more likely to be the problem than anything else.
 

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If it was ABS kicking in on you I think you'd know it as it would be a pretty harsh pulsing (at least it is in the cars I've been in with malfunctioning ABS sensors).

My guess is rotor/pad surface. How many miles are on the bike/rotors/pads? I'm thinking they just aren't fully bedded yet.
 

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Discussion Starter #9
If it was ABS kicking in on you I think you'd know it as it would be a pretty harsh pulsing (at least it is in the cars I've been in with malfunctioning ABS sensors).

My guess is rotor/pad surface. How many miles are on the bike/rotors/pads? I'm thinking they just aren't fully bedded yet.
Yeah, I’m fairly confident it’s not abs. The bike has 8300kms and to my knowledge the PO didn’t replace the pads and rotors. I’ll do a full brake clean/scuff up the rotors and pads and see how that goes.

Are the buttons/bobbins meant to have any movement in them?
 

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I have a 2014 (no ABS or TC) and I have the same issue. I cleaned the rotors and checked the bobbins which helped it a little bit, but it still exists. Let us know if you fix your pulsating issue.
 

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A little late to the party, but ive been having the same issues with my 2019 MT 09 just after 2200 miles. I took it into a registered dealership and long story short, yamaha is sending new brake rotors. Their explanation was that the material on the rotors are of a material that can become uneven causing the pulsation.
 

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thesmarte97 can you provide more detail into your issue? I'm experiencing some pulsation as well. I have a 2018 MT-09 purchased in 2019 w/ zero miles. I'm at the 5k mark and I'm I'm getting some pulsating only when using the front brakes. I just started noticing it as I don't use the front brakes that much... I rely on the rear brake for most of my riding. Only use front when extra braking is needed.

My next rides, I'll be using the fronts to test out WTF is going on.

If you can provide some deets on your experience with your stealership, I'll be able to use the same terminology to trigger a replacement if needed.

Kind regards, brah!
 

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I would think it is your rotors that are warped if it were me, I would start with getting the front end off the ground.

Then I would spin the front wheel with out the applying pressure to lever.

If warped they may touch with out any pressure applied to lever or hot spots like mentioned.

If they have a no drag then apply some pressure to recreate the same symptom.

It's a 2 person job or a 1 person plus treadmill .

I'm sure you get yhe point, I don't have ac front stand yet my self but will soon for situation like yours .

I use my front brakes alot and so far I have no complaints on my brakes they have been very faithful to me.
 

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I just started noticing it as I don't use the front brakes that much... I rely on the rear brake for most of my riding. Only use front when extra braking is needed. Quote]

This is the way to a big accident. By using the rear brake all the time you will be habituated to using it and your first response in a real high risk situation will be to hit the rear brake. You'll either lock up and skid into whatever is ahead, or loop it.
I'd suggest an advanced riding course.
 

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This is the way to a big accident. By using the rear brake all the time you will be habituated to using it and your first response in a real high risk situation will be to hit the rear brake. You'll either lock up and skid into whatever is ahead, or loop it.
I'd suggest an advanced riding course.
Thanks for the advice, LouG. I've had to emergency brake several times and I'm glad to report, I instinctively go for both brakes. My plan is to eventually take an advanced riding course, but I've also been devouring videos online and I go to an empty parking lot to practice. I've practiced emergency braking lots. Still need more practice though. I've almost eliminated the instinct of smashing the front lever. I am getting it to a nice smooth activation. It's so awesome slowly applying the brake seeing the front dip, feeling the grip increase, more brake, more stopping... and you actually do stop super quick. Loading them springy bits on the front really makes a difference in stopping power.
 

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...and long story short, yamaha is sending new brake rotors. Their explanation was that the material on the rotors are of a material that can become uneven causing the pulsation.
In continuation, I have used my fronts more and def have noticed pulsing at certain amounts of front brake application. So I may have the same problem as OP and thesmarte97.

Now, to approach the stealership...
 

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I just bought my FZ09 with 9,000 miles on it and noticed the slight pulsing only after I bought it. It is most noticeable when coming to a slow stop at a stop sign. The same thing happened on my '02 FZ1 and I chased the problem with new pads and then scouring the disks. In the end it needed new rotors and that's what I did straightaway this time. Put new stock rotors and pads ($300) on yesterday and the problem is solved.

There are a lot of us with the 2017-19 model that are experiencing the same issue and I'm concerned that the stock disk material is insufficient for the demands of normal use. Does anyone know if the 2014-16 disks are the same part number as the 2017-19 model?
 
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