Audi A4 Owner's Manual page 21

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Applies to vehicles: with cruise control system

Cruise control

The indicator lamp in the instrument cluster lights up when the
cruise control system is operating.
Anti-lock brake system (ABS)
The warning lamp monitors the ABS and the electronic
differential lock (EDL).

The warning lamp lights up for a few seconds when the ignition
is switched on and while the engine is being started. The lamp goes
out again once the system has run through an automatic test
sequence.
There is a fault in the ABS if:

the warning lamp does not light up when the ignition is
switched on,
the warning lamp does not go out again after a few seconds,
the warning lamp lights up when the vehicle is moving.
The vehicle can still be braked in the normal way (except that the
ABS control function is out of action). Please take the vehicle to a
qualified workshop as soon as possible. For further information on
the ABS ⇒ page 222.
If a fault occurs in the ABS, the ESP warning lamp will also light up.
Fault in the main brake system

If the ABS warning lamp lights up together with the brake
⇒ page 32, this indicates a fault in the ABS func-

warning lamp
tion, and possibly a malfunction in the main brake system as well
⇒
.
If there is a malfunction in the brake system the symbol
up in the instrument cluster. Please refer to ⇒ page 32.
Controls
Fault on the electronic differential lock (EDL)
The EDL works in conjunction with the ABS. If a malfunction should
occur in the EDL, this is indicated by the ABS warning lamp
Please take the vehicle to a qualified workshop as soon as possible.
For further information on the EDL ⇒ page 222.

observe the warning information on ⇒ page 255, "Working on
components in the engine compartment".
ABS warning lamp
brake fluid level in the reservoir. If the fluid level has dropped
below the "MIN" mark you must not drive on - otherwise there may
be an increased accident risk. You should obtain professional
assistance.
have been caused by a failure of the ABS control function. As a
result the rear wheels can lock relatively easily when braking. This
could cause the tail of the vehicle to skid sideways. Drive carefully
to the nearest qualified workshop and have the fault rectified.
Applies to vehicles: with Audi hold assist
Audi hold assist
This warning lamp monitors the Audi hold assist function.
Audi hold assist helps the driver to keep the vehicle stationary while
the engine is running, for instance on steep gradients, at traffic
lights or in stop-and-go traffic. When the Audi hold assist function
is on, you don't have to keep your foot on the brake to prevent the
vehicle from accidentally rolling away. Once it detects that the
 vehicle is stopped, Audi hold assist keeps the vehicle stationary. The
will light
green symbol
tion is activated. You can now take your foot off the brake pedal.
Safety Driving tips General maintenance
Instruments and warning/indicator lamps
WARNING
Before opening the bonnet and checking the brake fluid level,

If the brake warning lamp should light up together with the

, stop the vehicle immediately and check the
If the brake fluid level is OK, the fault in the brake system may


in the instrument cluster indicates that the func-
Self-help
19

.
Technical data