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WH15 - Checking and Tightening Bleeder Screw for Front Axle Lift System (Workshop
Campaign)
Important:

CRITICAL WARNING - This campaign includes steps where control unit(s) in the vehicle will be
programmed with the PIWIS Tester. The vehicle voltage must be maintained between 13.5 volts and 14.5
volts during this programming. Failure to maintain this voltage could result in damaged control unit(s).
Damage caused by inadequate voltage during programming is not a warrantable defect. The technician
must verify the actual vehicle voltage in the PIWIS Tester before starting the campaign and also document
the actual voltage on the repair order.

Model Year:

As of 2016 up to 2017

Model Line:

911 R (991), 911 Carrera (991 Gen. II)

Equipment:

Front axle lift system (I-no. 474)

Subject:

Bleeder screw for front axle lift system

Situation:

There is a possibility that the bleeder screw for the front axle lift system was not tightened to
the prescribed tightening torque on the affected vehicles.
This can impair the function of the lift system. The error message "Error lift system" can then be displayed
in the instrument cluster when the lift function is activated.

Remedial
Action:

•
•

Affected
Vehicles:

Check the area around the bleeder screw for the front axle lift system for visible traces of hydraulic
fluid and tighten bleeder screw.
Depending on the result of the check, fill the front axle lift system with hydraulic fluid or replace the
compressor for the front axle lift system.

Only the vehicles assigned to the campaign (see also PIWIS Vehicle information). This campaign affects
839 vehicles in North America.

Required parts and materials
Materials:

No parts or materials are required for checking the bleeder screw for the front axle lift system (Scope 1).
Materials required if the front axle lift system must be filled(Scope 2-3):
Part No.

Designation
– Use

Qty.

00004330550

 Oil
– Compressor for front axle lift system

As much as required
(max. 160 ml required
per vehicle)

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NOTE: PARTS WILL NOT BE AUTOMATICALLY ALLOCATED TO YOUR DEALERSHIP. ALL PARTS
MUST BE ORDERED VIA A PTEC/PAV.
Parts Info:

Additional parts required if the compressor for the front axle lift system must be replaced(Scope
4-5):
Part No.

Designation
– Use

Qty.

9P1412257C

 Level adjustment pump

1 ea.

99907286901

 Hexagon-head bolt
– Strut

2 ea.

99951004601

 Cheese head bolt
– Strut

2 ea.

99907344301

 Combination screw
– Strut

2 ea.

99907509501

 Combination screw
– Strut

2 ea.

Required tools
Tools:

Tools required for tightening the bleeder screw:
•
•

Torque wrench, 6 – 50 Nm (4.5 – 37 ftlb.), e.g. V.A.G 1331 - Torque wrench, 6-50 Nm (4.5-37
ftlb.)
Shop light

Additional tools required if the front axle lift system must be filled or if the compressor must be
replaced:
•
•
•
•

Torque wrench, 1.5 – 3 Nm (1 - 2 ftlb.), e.g. VAS 6494 - Torque screwdriver
Torque wrench, 6 – 50 Nm (4.5 – 37 ftlb.), e.g. V.A.G 1331 - Torque wrench, 6-50 Nm (4.5-37
ftlb.)
9900 - PIWIS Tester 3
Filling adapter for front axle lift system - Please order part # 9P1411813 if needed for filling adapter.
This can then be re-used.*

* If part/tool is unavailable, please submit PTEC/STR to request tool rental. For any questions on tool
rental, please contact Tool Technical Support Specialist - jeff.haller@porsche.us

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Technical Information

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ENU

WH15

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Checking area around the bleeder screw for front axle lift system for leaks and tightening bleeder
screw
Information
The procedure for checking and tightening the bleeder screw for the front axle lift system, described here
on the left-hand side of the vehicle as an example, must always be carried out on the left and right-hand
side of the vehicle.
Work Procedure: 1
2

Raise the vehicle on a lifting platform  Workshop Manual '4X00IN Lifting the vehicle'.
Perform a visual inspection to see whether hydraulic
fluid has leaked out at the bleeder screws  Visual
inspection of bleeder screw on actuator -2- on both
actuators  Visual inspection of bleeder screw on
actuator -3- on the front spring strut.
Result of check:
•

•

3

There are traces of hydraulic fluid visible at
the bleeder screws or underneath the actuator:
Hydraulic fluid has leaked out. The front axle lift
system must be filled. To do this, continue with
 Step 3.
If no hydraulic fluid has leaked out at the
bleeder screws, the front axle lift system does
not need to be filled. Continue with  Step 4.

Visual inspection of bleeder
screw on actuator

Drain and fill hydraulic fluid on the front axle lift system.
3.1

Deactivate front axle lift system using the switch in the vehicle (lower the vehicle).

3.2

Remove wheel  Workshop Manual '440519 Removing and installing wheel'.
Information
Before filling the lift system, make sure that the bleeder screws on both actuators are
tightened to the prescribed tightening torque of 7 Nm (5 ftlb.).

3.3

Drain and fill hydraulic fluid for lift system  Workshop Manual '430117 Draining and filling
hydraulic fluid for front axle lift system'.

3.4

Carry out a function test on the lift system using the switch in the vehicle.
•

•

If the front axle cannot be lifted or lowered, the compressor must be replaced.
For instructions, see  Workshop Manual '431519 Removing and installing
compressor for front axle lift system'.
If the front axle can be lifted and lowered, the function test is OK. Then continue with
 Step 3.5.

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3.5

Fit wheel  Workshop Manual '440519 Removing and installing wheel'.
Then continue with  Step 5.

4

Tighten bleeder screws for front axle lift system in the
front wheel housing.
4.1

Turn the steering fully to the left/right.

4.2

Pull off protection cap  Tightening bleeder
screw on actuator -1- on the bleeder screw
 Tightening bleeder screw on actuator -2-.

4.3

Tighten bleeder screw on the actuator 
Tightening bleeder screw on actuator -3using a torque wrench and socket insert a/f
12. Tightening torque 7 Nm (5 ftlb.)

4.4

Tightening bleeder screw on actuator
Fit protection cap  Tightening bleeder
screw on actuator -1- on the bleeder screw  Tightening bleeder screw on actuator -2again.

5

Remove the vehicle from the lifting platform.

6

Enter the campaign in the Warranty and Maintenance booklet.

Warranty processing
Scope 1:

Checking bleeder screw for front axle lift system for leaks and tightening bleeder screw.
Working time:
Checking bleeder screw for front axle lift system for leaks and tightening
bleeder screw.
Includes:
Raising and lowering the vehicle

Labor time: 19 TU

 Damage Code WH15 066 000 1

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Scope 2:

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Checking bleeder screw for front axle lift system for leaks and tightening bleeder screw.
Also filling hydraulic fluid.
•

Vehicles without central wheel lock

Working time:
Checking bleeder screw for front axle lift system for leaks and tightening
bleeder screw, also filling hydraulic fluid.
Includes:
Raising and lowering the vehicle
Removing and installing wheel
Bleeding the front axle lift system

Labor time: 71 TU

Required materials:
00004330550

Oil

0.8 ea.
(= approx. 160 ml)

 Damage Code WH15 066 000 1
Scope 3:

Checking bleeder screw for front axle lift system for leaks and tightening bleeder screw.
Also filling hydraulic fluid.
•

Vehicles with central wheel lock
Working time:
Checking bleeder screw for front axle lift system for leaks and tightening
bleeder screw, also filling hydraulic fluid.
Includes:
Raising and lowering the vehicle
Removing and installing wheel with central lock
Bleeding the front axle lift system

Labor time: 89 TU

Required materials:
00004330550

Oil

0.8 ea.
(= approx. 160 ml)

 Damage Code WH15 066 000 1

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Scope 4:

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Checking bleeder screw for front axle lift system for leaks and tightening bleeder screw.
Also replacing compressor for front axle lift system.
•

Vehicles without central wheel lock

Working time:
Checking bleeder screw for front axle lift system for leaks and tightening
bleeder screw, also replacing compressor for front axle lift system.
Includes:
Raising and lowering the vehicle
Removing and installing wheel
Removing and installing cover for front underbody
Removing and installing cover for center underbody
Removing and installing cover for rear underbody
Removing and installing strut
Removing and installing front-axle support
Draining and filling hydraulic fluid for front axle lift system
Bleeding the front axle lift system

Labor time: 266 TU

Parts required:
9P1412257C

Level adjustment pump

1 ea.

99907286901

Hexagon-head bolt

2 ea.

99951004601

Cheese head bolt

2 ea.

99907344301

Combination screw

2 ea.

99907509501

Combination screw

2 ea.

Oil

0.8 ea.
(= approx. 160 ml)

Required materials:
00004330550

 Damage Code WH15 066 000 2

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Service

Technical Information
Scope 5:

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WH15

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Checking bleeder screw for front axle lift system for leaks and tightening bleeder screw.
Also replacing compressor for front axle lift system.
•

Vehicles with central wheel lock

Working time:
Checking bleeder screw for front axle lift system for leaks and tightening
bleeder screw, also replacing compressor for front axle lift system.
Includes:
Raising and lowering the vehicle
Removing and installing wheel with central lock
Removing and installing cover for front underbody
Removing and installing cover for center underbody
Removing and installing cover for rear underbody
Removing and installing strut
Removing and installing front-axle support
Draining and filling hydraulic fluid for front axle lift system
Bleeding the front axle lift system

Labor time: 285 TU

Parts required:
9P1412257C

Level adjustment pump

1 ea.

99907286901

Hexagon-head bolt

2 ea.

99951004601

Cheese head bolt

2 ea.

99907344301

Combination screw

2 ea.

99907509501

Combination screw

2 ea.

Oil

0.8 ea.
(= approx. 160 ml)

Required materials:
00004330550

 Damage Code WH15 066 000 2
Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. If a particular condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your authorized Porsche Dealer for the latest information
about whether a particular technical bulletin applies to your vehicle. Part numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify the current and
correct part numbers. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS
Tester are the ones that must be followed.
© Porsche Cars North America, Inc.
Dr. Ing. h.c. F. Porsche AG is the owner of numerous trademarks, both registered and unregistered, including without limitation the Porsche Crest®, Porsche®, Boxster®, Carrera®, Cayenne®,
Cayman®, Macan®, Panamera®, Speedster®, Spyder®, Tiptronic®, VarioCam®, PCM®, PDK®, 911®, RS®, 4S®, 718®, 918 Spyder®, FOUR UNCOMPROMISED®, and the model numbers and
distinctive shapes of the Porsche automobiles such as, the federally registered 911 and Boxster automobiles. The third party trademarks contained herein are the properties of their respective owners.
Porsche Cars North America, Inc. believes the specifications to be correct at the time of printing. However, specifications, standard equipment and options are subject to change without notice. Some
options may be unavailable when a car is built. Some vehicles may be shown with non-U.S. equipment. Please ask your authorized Porsche dealer for advice concerning the current availability of options
and verify the optional equipment that you ordered. Porsche recommends seat belt usage and observance of traffic laws at all times.
Printed in the USA

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