Appendix II:
ABS Common Sense
1. If braking distance will be shorter after installing ABS?
According to experimental statistics, the braking distance will be shorter (about 5% ~
20%) on most roads; but it can be longer on some special roads (like snow, non-asphalt
and uneven roads), but with stable steering.
2. What are the main purposes of ABS?
The main purpose of ABS is to prevent block. The functions are as follows:
(1) To stabilize the vehicle when braking
(2) To control the direction of the vehicle during braking to avoid collision
(3) To maintain the best brake pressure regardless of the skill of driver
3. Why ABS warning lamp is turned on?
After the vehicle is started, warning lamp will be turned off if no fault is detected by the
self-diagnosis of ECU of ABS. If warning lamp is turned on or can not be turned off when
vehicle is running, the ABS is abnormal and ABS check in appointed service factory is
necessary. When warning lamp is turned on and ABS is abnormal, the brake system still
has the basic braking ability.
4. Will no accident happen if ABS is installed?
ABS is an equipment to improve driving safety, not to avoid accident caused by driving
mistake or traffic condition. As a result, do not depend too much on ABS. Please always
drive safely.
5. Is it caused by ABS that the vehicle drifts to one side when running on a slippery
road?
This is because the friction coefficients of the left and right wheels are different. ABS
can stabilize the vehicle in this situation, but the driver should also control the steering
wheel to avoid accident.
6. The vehicle will drift before braking when turning on a slippery road. Does ABS work if
to brake now?
Definitely ABS will work effectively and may stabilize the vehicle according to the speed,
but the position of vehicle can only be adjusted slightly even ABS works because the
outward force is too large for the inertia. Usually there are two kinds of forces during
turning: one is needed when running and braking; the other is needed when turning and
stabilizing. Actually running, braking and turning of the vehicle are coordinated by the
two kinds of forces above; and they are in inverse proportion to each other. As a result,
the brake force will increase while the turning and stabilizing force will decrease if to
brake when turning. The two kinds of forces can be adjusted to the best on the vehicle
with ABS; but they can not be adjusted on the vehicle without ABS, which will weaken its
steering performance and stability.
If the two kinds of forces are too small (For example, the vehicle will leave the running
route as the speed is too high when drifting), the force to adjust the vehicle is too small,
the ABS effect is not obvious. In a word, deceleration in advance and safe turning is the
best solution.
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