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carmechanic



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Location: Klausenburg, Romania

PostPosted: Sat Jan 16, 2010 3:01 pm    Post subject: The Scooter ABS Reply with quote

Many chinese scooters are equipped with the famous ABS - bottle.


I took mine apart to see what's inside and how does it really work.
The next pictures present the inner parts of the standard scooter ABS - bottle.











The scooter ABS works in a way exactly like a pressure regulator from an ordinary air compressor - when the applied pressure from the master cylinder exceeds the set pressure by the inner spring, then the ABS applies the pressure to the caliper in a series of "impulses" so the wheel cannot lock. (the piston compresses the spring and shuts off the passing of brake fluid towards the caliper ; then, when the pressure lowers a bit, the spring moves the piston back up and the process repeats itself ; I think it can be called an oscillation )



The conclusion : the device is verry simple and robust and really nothing can go wrong inside it.
I can say that this ABS thing saved me more than twice in emergency stops. The scooter stopped instantly but the wheel never locked-up. First time I was surprised. It's great knowing that the ABS is there and does its job.



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Scootin
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PostPosted: Sat Jan 16, 2010 3:29 pm    Post subject: Reply with quote

Nice job! Icon_thumbs_up K+ for that

My ABS has saved my bacon too!



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larry8



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PostPosted: Sat Jan 16, 2010 4:21 pm    Post subject: Reply with quote

That's an informative documentary on how the device works.
But, remember that it is not a true ABS.
It only works at max pressure from the caliper, so it is only effective when applied on a dry road during very hard braking. On wet or slippery surfaces, the wheel will still lock up. It has no input as to what the wheel is doing, like skidding on wet or slippery surfaces.

A true ABS has a sensor that tells the computer what the wheel is doing on all surfaces even when those surfaces are slippery and it acts accordingly to not have the brake make the wheel skid. BMW and other manufacturers have this type ABS system that is similar to the ones employed on cars.



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carmechanic



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PostPosted: Sat Jan 16, 2010 6:37 pm    Post subject: Reply with quote

larry8 wrote:
But, remember that it is not a true ABS


For sure........and nobody ever said that the device is a true ABS.
It was designed to help only in case of an emergency brake. And it does that well. :D
And speaking of a true ABS, because of the complexity of motion of a 2 wheeled vehicle, I doubt that such a true ABS or stabilizing system will ever work properly. After all, that's the beauty in riding on 2 wheels....it takes skill and a good sense of equilibrium. Laughing



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larry8



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PostPosted: Sat Jan 16, 2010 8:45 pm    Post subject: Reply with quote

carmechanic wrote:

For sure........and nobody ever said that the device is a true ABS.
It was designed to help only in case of an emergency brake. And it does that well. :D
And speaking of a true ABS, because of the complexity of motion of a 2 wheeled vehicle, I doubt that such a true ABS or stabilizing system will ever work properly. After all, that's the beauty in riding on 2 wheels....it takes skill and a good sense of equilibrium. Laughing



Actually, the BMW ABS works very well. Some models also have an automatic traction control too that limits wheel spin on slippery surfaces. I believe some Honda models and a few others have ABS.



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carmechanic



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PostPosted: Sat Jan 16, 2010 10:37 pm    Post subject: Reply with quote

Larry.......I'm refering to ABS systems on 2 wheeled vehicles.
In case of 2 wheels you really cannot stabilize the vehicle like in case of a car for example, no matter how good the ABS is.



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spitfire355



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PostPosted: Sat Jan 16, 2010 11:03 pm    Post subject: Reply with quote

Do you know if you can buy the bottles seperately and fit them to a bike that doesnt already have them? Or are they not a worthwhile buy?


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larry8



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PostPosted: Sat Jan 16, 2010 11:57 pm    Post subject: Reply with quote

carmechanic wrote:
Larry.......I'm refering to ABS systems on 2 wheeled vehicles.
In case of 2 wheels you really cannot stabilize the vehicle like in case of a car for example, no matter how good the ABS is.



So was I.
My post was about the BMW motorcycles.



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carmechanic



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PostPosted: Sun Jan 17, 2010 1:42 pm    Post subject: Reply with quote

spitfire355 wrote:
Do you know if you can buy the bottles seperately and fit them to a bike that doesnt already have them? Or are they not a worthwhile buy?


I guess you can buy them from here : http://www.alibaba.com/product-gs/250228645/ZX_501_motorcycle_ABS_parts/showimage.html

And yes........to install such an ABS bottle, one needs to simply remove the banjo fitting from the caliper, screw in the adapter and the ABS bottle on the caliper, and then re-fit the banjo fitting on the ABS bottle.
And off course in the end you need to bleed the brake.



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spitfire355



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PostPosted: Sun Jan 17, 2010 7:07 pm    Post subject: Reply with quote

Hmm, this is a bit strange, I looked at my bike, and it looks like there is already ABS on it, as a bottle exactly like the one pictured is fitted on both my front and rear brakes. However, its a 3 and a half year bike and I thought these were a recent addition? I'll investigate further when I have the time


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larry8



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PostPosted: Sun Jan 17, 2010 8:28 pm    Post subject: Reply with quote

spitfire355 wrote:
Hmm, this is a bit strange, I looked at my bike, and it looks like there is already ABS on it, as a bottle exactly like the one pictured is fitted on both my front and rear brakes. However, its a 3 and a half year bike and I thought these were a recent addition? I'll investigate further when I have the time


Those devices were on my '04 Chinese scoot too.



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'67 BMW R69S-"Toots" in rehab
'09 SC250
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'04 Chinese 125
'06 X9-500
'08 MP3-400
'06 BV500
'09 Mana
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