911 Turbo AWD F6-3600cc 3.6L SOHC Twin Turbo (1997)
Caution: A pressure of up to 180 bar is present in the system.
Wear goggles and protective gloves!
To allow the brake fluid to be changed in a rapid and practical manner, a filling and bleeding device should be used.
Bleeding Procedure
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After the pressure has been released from the booster circuit, top up with fresh brake fluid to upper edge of reservoir. Connect bleeder
device to reservoir.
Connect overflow hose (block vent with hose clamp).
Switch on bleeder device. Bleeding pressure approx. 1.5 bar.
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Bleed booster circuit partially as follows (simplified bleeding):
Open bleeder valve at pressure accumulator (use recipient bottle). Connect electrical connector to pump. As soon as the escaping brake
fluid is free from air bubbles, pull off electrical connector and close bleeder valve.
Note
For the following bleeding processes, the booster circuit remains depressurized.
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Proceed by bleeding the brake calipers. Bleeding sequence: Rear right / rear left / front right / front left.
Open each bleeder valve until clear, bubble- free brake fluid escapes. Note that each caliper must be bled at both bleeder valves.
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Use a recipient bottle to allow the escaping brake fluid to be checked accurately for cleanliness and freedom from bubbles and to determine
the quantity of brake fluid used.
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After a new brake master cylinder has been fitted, proceed as follows during the bleeding process: Open rear right bleeder valves and
depress brake pedal fully several times. keep pedal depressed for 2 to 3 seconds each time and release pedal slowly.
Repeat this process in the following sequence: Rear left, front right / front left. This allows all air bubbles to be removed from the brake
master cylinder.
Note
Also proceed in this manner if the hydraulic brake system has been drained virtually completely or if residual air remains in the system after
bleeding has been completed (excessive pedal travel).
Caution: Double the pumping cycles on high- mileage vehicles or older vehicles but use only half the brake master cylinder stroke in these
cases (to avoid damage to the master cylinder, i.e. primary cups).
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Complete bleeding (continue with the next item) or continue by bleeding the ABD circuit, if required (refer to Re- 2).
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Switch off and disconnect bleeder device.
Remove hose clamp from overflow hose (vent).
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Fill pressure accumulator completely by reconnecting the electrical connector.
