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Stelvio front wheel jumping when i'am braking

tomas

tomas

Just got it firing!
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Hi there. I'am trying to fing solution about this problem in my Stelvio NTX 8V 2010. My front wheel is jumping when i am braking. There is pulsation of the handle, the brakes seem to brake and release. Someone with similar problem?
 
The rotors have pad material melted on them jack up the front and scrub the crap off them with coarse sand paper or such try not to get them so hot stopping and then hold the front brake hold with the rear instead
 
Hello,
I also have a similar very slight pulsing sensation - But No Bunny Hopping !
I am thinking its Rotor ( Disk related ) maybe warped or how ever unlikely some contamination on the pads / rotor surface.
( But I would expect that to be consistent rather than pulse )

I'll try some brake cleaner on it ... and report back.
 
Do what vagrant suggested and also check the buttons on the rotors. Worst case is warped rotor(s).
 
Checking for brake rotor warpage is easy enough with a felt marker pen and some creative way to secure it to a fork leg and then
check for the marks left after spinning the wheel .Softer sprung front end (80's and 90's BMW) would noticeably pulse at .003" warp , H-D would require at least '006" to exhibit the same degree of pulsing . Quick and cheap . Peter
 
I tried with buttons, does not helped. Next I will clean the discs and measure eventually if discs are warped.
Thanks for now. I will write how I deal with this.
 
The pulsing you are feeling is being caused by one thing.

For whatever reason, the disc rotor is PUSHING BACK against the pad and causing the hydraulic fluid to transmit this hydraulic pressure increase, back to the lever where you can feel it.

As previously mentioned, the bobbins (incorrectly called buttons)that the rotor floats upon, can get dirty, corroded, or just gummed up with dirt and crud and they no longer allow the rotor to move freely like it should.

To clean them, find a piece of wood dowel that preferably is or can be tapered with some sandpaper so that you can press it snugly into the bobbin from one side, and using friction from the wood, turn the bobbin back and forth while spraying some brake cleaner into the space between the bobbins and the rotor. Do this to every bobbin and then test ride it again.

If the pulsing remains, check the lateral runout on the rotor. Is it warped? If so, then they need to be replaced and it will fix your problem.

NOTE: Checking lateral runout is useless if you do not first ensure that the bobbins are clean and allowing proper free movement of the rotor. If the rotor is bound up from a dirty bobbin, then the runout will not actually be caused by rotor warpage but rather stuck bobbins!

However, you more than likely will find that properly cleaning the bobbins and making sure they have they ability to move as designed, fixes the issue.

Good Luck!
 
Last edited:
scottmastrocinque said:
As previously mentioned, the bobbins (incorrectly called buttons)that the rotor floats upon, can get dirty, corroded, or just gummed up with dirt and crud and they no longer allow the rotor to move freely like it should.

To clean them, find a piece of wood dowel that preferably is or can be tapered with some sandpaper so that you can press it snugly into the bobbin from one side, and using friction from the wood, turn the bobbin back and forth while spraying some brake cleaner into the space between the bobbins and the rotor. Do this to every bobbin and then test ride it again.!
Click to expand...

Thanks for the tip, I was looking the the front rotor last night and there was nothing I could see, but did notice those bobbins, the Honda disk is bolted on not “Floating.
I never realized it was Really floating, eg: allowed some movement...
Learn something new every day !
 
No effect of fine cleaning of the discs.
When I took off the brakes I notice that the wheel is slightly bent. This probably affects the discs that I will have to replace. Any experience with wheel centering and quality discs?
 
I would have wheel checked. Most likely not bent up to where rotor attaches. See Todds store here for quality brake parts.
 
tomas said:
No effect of fine cleaning of the discs.
When I took off the brakes I notice that the wheel is slightly bent. This probably affects the discs that I will have to replace. Any experience with wheel centering and quality discs?
Click to expand...

I know of shops in the USA that can straighten cast wheels so it can be done. You will have to search your area to find a shop that can accomplish the task.
 
I had to replace one disk early on in my ownership because of brake pulsing, later investigation (using a surface table and some decent measuring equipment) showed it was the alloy carrier that bolts to the hub and carries the disk that was bent rather than the rotor itself. I have always suspected that it was damaged by someone during a tyre change.
 
This weekend I will deal with the all wheel. First demontage of the wheel, second i'll take off the disk and then centering of the rim, third replacing glycerin and brake pads brembo, and if after this are still pulsating i will not have a choice but to buy new disks.
 
Unfortunately nothing of this helped. Starting to looking for new disks. What do you think guys for NG Brake disk, any opinion? Seems that price is ok, but quality?
 
Paul_Tim said:
I had to replace one disk early on in my ownership because of brake pulsing, later investigation (using a surface table and some decent measuring equipment) showed it was the alloy carrier that bolts to the hub and carries the disk that was bent rather than the rotor itself. I have always suspected that it was damaged by someone during a tyre change.
Click to expand...

PS: were you able to buy just a new Carrier , does it come with the rotor ?
 
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