The Scooter ABS

carmechanic · Posted: Sat Jan 16, 2010 3:01 pm Post subject: The Scooter ABS

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.

_________________
- JONWAY YY50QT-20B
- LINHAI Prince
- PEDA Eagle, 2 stroke Smile

Scootin · Posted: Sat Jan 16, 2010 3:29 pm Post subject:

Nice job!

K+ for that

My ABS has saved my bacon too!

_________________
2005 50cc Taishan Sport XT

2006 150cc Hitong SR-150 (2007-2010)

larry8 · Posted: Sat Jan 16, 2010 4:21 pm Post subject:

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.

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

carmechanic · Posted: Sat Jan 16, 2010 6:37 pm Post subject:

larry8 · Posted: Sat Jan 16, 2010 8:45 pm Post subject:

carmechanic · Posted: Sat Jan 16, 2010 10:37 pm Post subject:

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.

_________________
- JONWAY YY50QT-20B
- LINHAI Prince
- PEDA Eagle, 2 stroke Smile

spitfire355 · Posted: Sat Jan 16, 2010 11:03 pm Post subject:

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?

larry8 · Posted: Sat Jan 16, 2010 11:57 pm Post subject:

carmechanic · Posted: Sun Jan 17, 2010 1:42 pm Post subject:

spitfire355 · Posted: Sun Jan 17, 2010 7:07 pm Post subject:

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

larry8 · Posted: Sun Jan 17, 2010 8:28 pm Post subject:

	Chinese Scooter Club Forum Index -> Tuning and Modifications	All times are GMT
Page 1 of 1