Brake Judder.

[Dave M]

Afternoon. Bought a Suzuki Burgman 125 as a winter hack and did a service including new pads front and rear. Also had to buy a used front caliper because pad pin was seized completely. Anyway put pads in and new fluid. All went well enough. Took it out for a spin and I'm getting a heavy juddering when using front brake at higher speed (not noticeable at lower speeds) Could this be a warped disc, bearings or a dodgy caliper? Any ideas please? Cheers.

[monkeybiker]

Sounds like a warped disc to me but I not an expert on this.

[Itchy]

Take off the front disc put it on a sheet of glass to see if it is warped.
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Spain 2008France 2007Big one 2009 We all die. The goal isn't to live forever, the goal is to create something that will. In the end, your life will flash before your eyes. Make sure it is worth watching.

[Dave M]

[stirlinggaz]

hi,
dont try remove the bolts with normal alllen keys.
use hex bits. but before you attempt to loosen them, put the bit in & give it a sharp whack with a hammer.
these bolts are usually threadlocked so use a breaker bar. trust me, i found out the hard way, with sheared/rounded bolts.
cheers,
GAZ

[c_dug]

[Vincent]

Sounds lethal

What does the lever feel like?

Are the pads sticking on?
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Space Is Deep

[Ste]

Check the head bearings.

Standing still, put the front brake on and try rocking the bike backwards and forwards to see if there's any movement in the head bearing.

[stirlinggaz]

[Dave M]

[Vincent]

If no dial gauge, you can sometimes tell if the disc is out by taping something on the fork leg or wherever to act as an indicator....something that just touches the disc......... and spinning the wheel, if you see what I mean. In fact, you can usually see it by just spinning the wheel.

The disc bolts will probably have loctite too.......so will need a hot gun to free them off.
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[Eddie Hitler]

My bet is on the head bearings, simply spinning the front wheel by hand should show if your discs are bent or not.

[andys675]

[Dave M]

[UrbanRacer]

As everyone else says, Warped disc or Head stock bearings are done.

[Dave M]

[whitedevil]

If you do find there is some run out on the discs, remove them and clean up the area where they mount to the bike and you may find they aren't warped at all. Its also worth cleaning the bobbins the discs float on as these can get seized up and throw the disc out of alignment.
To clean the bobbins put a nut and bolt through them and tighten it up and it will press on the bobbin and spin it, freeing it off, spray brake cleaner on it while you do this to clean and crap out of there.
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GPZ500 sold ~ CBR600FS-2 sold ~ ZX6R sold ~ Street Triple R

[Dave M]

Think I may have found the problem. The disc that's on the wheel is the upgraded disc which only has 3 bolts securing it on but the wheel is the older model which has threads for 6 bolts. I'm thinking that the disc is badly warped due to uneven wear across the disc due to only having 3 bolts? Does that make sense? Could this be the problem? I can't get the bolts out for love nor money. I've used breaker and impact but don't have a torch to heat it up! I've seen a complete wheel on the bay for decent money so might buy that if I can't get these bolts off. What do you guys think? The disc is fairly warped just by looking at it.

[Vincent]

You can pick used heat guns up off eBay really cheap...esp if you find one locally that you can collect. A torch, would be a bit of an overkill IMO - it'd still work but would leave scorch marks.
With really stubborn bolts, I've hammered a torx bit into the bolt and used that.

https://i77.photobucket.com/albums/j71/Drewskovitch/Discboltremoval.jpg
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[Itchy]

[bradh511]

All Im going to say is impact screw driver works wonders and plus gas or wd40
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Theory 11-10-12 lets hope i get mod 1 and 2 done by the 18th of jan 2013

[bradh511]

All Im going to say is impact screw driver works wonders and plus gas or wd40
____________________
Theory 11-10-12 lets hope i get mod 1 and 2 done by the 18th of jan 2013

[Dave M]

[Vincent]

Any hair dryers in the house?
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Space Is Deep

[Dave M]