Front brake dragging - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 10-17-2008, 05:30 PM Thread Starter
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Front brake dragging

Hey folks.

I just got a '94 VN750 from a friend. I haven't ridden it yet cause I have to fix it first, but I figured that should be a piece of cake with this website out here.

So I am killing time waiting for parts to come in and trying to work on what I can without parts.

The reason I am writing is because the front brake seems to drag a bit, not so much that it stops the bike completely, but enough that there is a scraping noise when the front wheel turns and a bit of resistance. The bike hasn't been ridden in a while and there is a pretty decent amount of rust on the rotors and pads.

Pads are 1/8 of an inch thick (sorry I had no metric tape measure, guess I had better invest in one since this a metric, lol).

I did the conversion (3.1750mm) and they seem to be in spec.

I bled the brakes and the left one had fluid in it the color of coke, the right had no fluid at all.

I completely purged the system, recharging the master cylinder as I went until the fluid came out clear on both sides.

I did order a set of speed bleeders because I am not completely confident in my brake bleeding ability.

So after the long winded explanation all that I have done has made basically no difference. MC resovior is full, the sqeeze in the handle seems normal not spongy, and yet the front brakes are still dragging.

What could be causing the front pads to drag on the rotor or is it a function of the rust and the bike sitting for a while?

I will have to have this issue fixed before I ride, for obvious reasons, I may be a risk taker but I am not stupid.

Any thoughts?

Thanks

Craig
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post #2 of 8 (permalink) Old 10-17-2008, 05:41 PM
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I would have to guess (without seeing it personally) that the drag is caused from the rusty rotors. this will dissappear within a few miles, but I'd take it easy the first trip just in case.

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post #3 of 8 (permalink) Old 10-17-2008, 06:24 PM
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The front brakes do drag a little bit. Not much. It could be the amount of rust on there. Like dragon said...take it easy and slow the first few times out and work the front brakes.

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post #4 of 8 (permalink) Old 10-17-2008, 08:18 PM Thread Starter
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Slow and steady

OK... That sounds good, I still have a bunch of work to do, but I will keep her slow to start out until I break the rust off. As long as it is fairly normal for the front brakes to drag a little I won't sweat it.
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post #5 of 8 (permalink) Old 10-17-2008, 08:45 PM
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Read this thread:

https://www.vn750.com/forum/showthread.php?t=8788


The pads normaly do touch the rotor, and present no problem once the wheel gets up to speed.

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post #6 of 8 (permalink) Old 10-17-2008, 09:08 PM
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Quote:
Originally Posted by Knifemaker View Post
Read this thread:

https://www.vn750.com/forum/showthread.php?t=8788


The pads normaly do touch the rotor, and present no problem once the wheel gets up to speed.

KM
Like KM said...read the thread and flush your brakes and bleed them good. I had the same but a bit worst a bit back and needed to do the same now the feel better. You may need to clean your calipers too. If not then it's best to do it anyway so you know their good.

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post #7 of 8 (permalink) Old 10-18-2008, 12:43 AM
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I read somewhere someone used brillo pads to clean rust off the rotors successfully. That might be all you need since you've flushed out the junk and got fresh fluid in there.

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post #8 of 8 (permalink) Old 10-18-2008, 01:41 PM
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Quote:
Originally Posted by antiq View Post
I read somewhere someone used brillo pads to clean rust off the rotors successfully. That might be all you need since you've flushed out the junk and got fresh fluid in there.
Well , medium size steel wool would work fine (which brillo pads are) but as the brillo pad has soap in it, I'd not use it. The soap could get trapped in the fine grooves worn into the rotor and act much like putting grease on them...a very bad thing.

You do not need to clean the rust off the rotor where the pad actualy contacts it, as this will get worn off rather quickly the first time you use the brakes. Also, even with a steady hand, you can't follow the wear lines on the rotor with a steel wool pad, so you would end up putting fine scatches "against the grain" so to speak, another thing you'd want to avoid.

You can however use the steel wool to remove rust off the areas that the pads do not contact. But I would let the brake pads themselves clear off any rust on the rotor where they in fact touch.

The rotor is "stainless steel" and thus should not be all that rusty to begin with...you should see the steel rotors on my car after a rain, they look like they been sitting out for years...but a short drive down the road and they get cleaned off quickly.

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