No. 4-23

Service
Technical Information
4/23
ENU
WPA1
4
WPA1 – Reworking Brake Line Threading (Workshop Campaign)
Revision:
This bulletin replaces bulletin Group 4 4/23 WPA1, dated March 17, 2023.
Model Year:
As of 2022
Model Line:
911 (992)
718 Boxster (982)
718 Cayman (982)
Concerns:
Brake line screw connection between brake calliper and brake hose
Cause:
On the affected vehicles, the brake line screw connection on the front and rear axles may not
have been fully tightened to the prescribed final tightening torque.
Action:
Tighten the brake line screw connections on the front and rear axle to the specified final tightening torque.
Affected
Vehicles:
Only vehicles assigned to the campaign (see also PCSS Vehicle Information).
Required tools
Tools:
•
•
Torque spanner, 6 – 50 Nm (4.5 – 37 ftlb.), e.g. VAG 1331A torque spanner, 6-50 Nm (4.5-37
ftlb.)
Torque spanner, 150 – 800 Nm (111 – 592 ftlb.), e.g. VAG 1601 torque spanner, 150 - 800 Nm
(111 - 592 ftlb.)
Additional required tool for vehicles with central wheel bolts (I-no. 1PJ):
•
•
9796 - Socket spanner for central wheel bolt
9794 - Assembly aid for central wheel bolt
Reworking brake line threading
Work Procedure: 1
2
Move the vehicle onto a lifting platform and raise it.  Workshop Manual '4X00IN01 Raising the
vehicle'.
Remove wheels.
 Workshop Manual '440519 Removing and installing wheel'.
 Workshop Manual '440519 Remove and install wheel with central bolt'.
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May 1, 2023
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Service
WPA1
ENU
Technical Information
4/23
3
Tighten screw connections of the brake lines 
Brake line screw connection -1- and  Brake line
screw connection -3- on the front and rear axles at
left and right with Tightening torque 13 Nm.
4
Install wheels.
 Workshop Manual '440519 Removing and
installing wheel'.
 Workshop Manual '440519 Remove and install
wheel with central bolt'.
5
Lower the vehicle and remove it from the lifting
platform.
6
Enter the campaign in the Warranty and Maintenance booklet.
Brake line screw connection
Warranty processing
Information
The specified labor times were determined specifically for carrying out this campaign and include
all necessary preliminary and subsequent rework. The labor time may differ from the working times
published in the Labor Operation List in the PCSS.
Scope 1:
Reworking brake line threading
•
For vehicles with standard wheel bolts (M-no. 1PA) or wheel bolts with anti-theft protection (M-no.
1PD)
Labor time:
Reworking brake line threading
Includes:
Removing and installing wheels
 Damage code WPA1 066 000 1
May 1, 2023
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AfterSales
Labor time: 85 TU
Service
Technical Information
Scope 2:
4/23
ENU
WPA1
4
Reworking brake line threading
•
For vehicles with central wheel bolts (M-no. 1PJ)
Labor time:
Reworking brake line threading
Includes:
Removing and installing wheels
Labor time: 129 TU
 Damage code WPA1 066 000 1
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. Part numbers listed in these bulletins are for reference only. 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.
© 2023 Porsche Cars North America, Inc.
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May 1, 2023
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