911 Carrera 4 Cabriolet AWD F6-3600cc 3.6L SOHC (1990)
Note
Insofar as the filling and bleeding device is not connected (is required only for step 1), always check the fluid level in the fluid reservoir
between the bleeding operations and top up with new brake fluid if necessary.
Open the bleeder valve at the valve block. Plug the electrical plug onto the pump. Disconnect the electrical plug and close the bleeder valve as soon
as the brake fluid emerges without air bubbles.
Now completely fill the pressure accumulator (bleeder valves closed). For this purpose, connect the electrical plug. As soon as the pump has audibly
switched off, disconnect the electrical plug and completely discharge the pressure at the bleeder valve of the pressure accumulator. Slowly open the
bleeder valve and hold the bleeder hose tightly.
Caution: A pressure of up to 180 bar is present. Wear protective goggles and protective gloves.
Repeat the last operation (completely fill the pressure accumulator and then completely drain the accumulator pressure) approx. 1-2 times (brake
fluid must be free of air bubbles).
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Also bleed the valve block in the same way (as for the pressure accumulator) approx. 1-2 times.
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When it is guaranteed that bleeding has been performed so that there are no longer any air bubbles, securely tighten the bleeder valves and plug the
electrical plug onto the pump.
Ensure that the plug engages properly.
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Switch off the bleeding device if appropriate and disconnect. Also remove the hose clamp from the overflow hose (ventilation).
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Press the brake pedal several times. The bleeding device must not be connected.)
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Continue with bleeding the lock cylinders and pressure lines.
Bleeding the lock cylinders and pressure lines (step 3)
In the following work step, the solenoid valves are operated with the system tester 9288. The high pressure present at the solenoid valves is thus
supplied in pulse form into the pressure lines and to the lock cylinders via the check valves.
Remove brake fluid at the bleeder valves of the lock cylinders until no air bubbles appear anymore. Top up fluid reservoir in between if necessary).
(Please refer to Further to 2: (Bleeding the lock cylinders and pressure lines).
