Bleeding; Bleeding The Abd Circuit - Porsche Boxster Technical Manual

Boxster Anti-lock brake system, diagnosis 45
8
Menu: Bleed (ABSlrC 5.3)
Bleeding
Important notes
The Bleed menu is not available with the Solo
ABS (it is not required).
On vehicles with Traction Control, this menu can
be used to bleed the ABD secondary circuit in
the hydraulic unit.
This additional bleeding is necessary only after ~:~:, , ,
conventional bleeding has been performed and ." '. ..
8 only if the hydraulic unit is replacaed or was 12.96
removed. The secondary circuit also can be bled -Open the rear right bleeder valve (use collec-
in the event that the brake pedal travel is too tion bottle).
large if the system was properly bled by the con-
ventional method beforehand.
-Press the Start key on the System Tester.
This initiates certain functions in the hy-
Bleeding the ABD circuit draulic unit (the return pump, outlet solenoid
valve and the switch-over solenoid valve are
-Preparatory work: Bleed brakes by conven- activated).
tional method Bleed the system until the brake fluid
(repair group 47, Volume 4, Running gear). emerges without bubbles.
In addition (during the entire bleeding pro-
cess), fully depress the brake pedal to the
-The bleeding unit remains connected stop (pump) at least ten times.
(switched on) when the ABD circuit is being Important: Double the number of pumping
bled. cycles for vehicles with extremely high mi-
8 Bleed pressure. 1.5...2.0 bar. leage or for very old vehicles, and use only
half of the master brake cylinder stroke (dam-
-Connect the Porsche System Tester 2 to ~ge could.be caused to the master brake cy-
the diagnostic socket. linder / primary boots).
The diagnostic socket is located in the
driver's footwell (left-hand drive vehicles) or
passenger's footwell (right-hand drive ve-
hicles) near the fuse box.
Switch on the ignition. Select the "Bleed"
menu in the ABS;rC system.
8
45 02 Diagnosis/troubleshooting, anti-lock brake system 45 -D 43
Printed in Germany -3, 1996 986D451
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