Audi Q5: Auto Hold
Function Description - Auto Hold
The vehicle is equipped with Audi Hold Assist depending on
the model.
Function
The function assists the driver if the vehicle must remain
stopped frequently or for long periods of time when the engine
is running.
When the vehicle is stopped and the function is activated,
the vehicle is held in place by Audi Hold Assist.
The driver can release the brake pedal.
The vehicle is held in place by maintaining the brake
pressure on all four wheels in ESP.
To prevent the ESP solenoid valves to overheat when stopped
for long periods of time, the rear electromechanical parking
brake automatically takes over braking when the solenoid valves
reach a temperature of 200 ºC.
The point when the brakes automatically release is based on
the following information:
- Engine speed
- Angle
- Gear engaged
- with manual transmissions, distance on the clutch pedal
through the clutch sensor
- with automatic transmissions, through converter release
To prevent the vehicle from rolling back, the brakes are
only released when there is sufficient engine torque.
Activation
The following conditions must be fulfilled to switch the
"stand by" function on:
- Driver wearing seat belt
- Engine running
- Driver door closed
- ESP and electromechanical parking brake without malfunction.
The switch -2- in the center
console activates the function.
The switch indicates the operating conditions.
- Deactivated - the LED in the switch is off.
- stand by - the LED in the switch is on.
- Active - the LED in the switch is on and the instrument
cluster display shows a green "P".
Braking function is only transferred from ESP to the
electromechanical parking brake if the "green P" in the
instrument cluster is visible and if:
- the solenoid valves in ESP have reached a temperature of 200
ºC
- the driver door is opened
- the driver seat belt is unlatched
- the engine is stopped
- the ignition is switched off
- the switch is operated
- the brake pedal or gas pedal are pressed.
- the Audi Hold Assist switch is operated without pressing the
brake.
Note
When braking function is transferred from the ESP to the
electromechanical parking brake, the instrument cluster display
changes from a "green P" to a "red P".
Special Tools
Special tools and workshop equipment
required
- Release Tool for Brake Light Switch -T40168A-
- Torque Wrench 1410 -VAG1410-
- Brake Pedal Actuator -VAG1869/2-.
- Container -1- from the Brake
Charger/Bleeder Unit -VAS5234-
READ NEXT:
Overview - Front Brakes, 1LA, 1LJ, 1ZB and 1ZT
1 - Brake Pads
Illustration of left front with brake wear cable
Note
The inner surface (with tension spring) in the left brake cali
Special tools and workshop equipment
required
Torque Wrench 1331 5-50Nm -VAG1331-
Torque Wrench 1331 Insert - Reversible Ratchet -VAG1331/1-
Piston Resetting Tool -T10145-
Note
If old br
SEE MORE:
1 - Bolt
70 Nm +180º
Always replace if removed
Must be tightened in the curb weight position. Refer to
→ Chapter "Wheel Bearing in Curb Weight, Lifting Vehicles with Coil
Spring".
2 - Bracket
3 - Left Rear Level Control System Sensor -G76-
Only sensors
High pressure side are the condenser, receiver/dryer and
restrictor or expansion valve to separate the high and low
pressure liquid ends.
High pressure results from the restrictor or expansion valve
forming a constriction and causing the refrigerant to
accumulate, thus leading to an increase in