911 Carrera 4 Cabriolet AWD F6-3600cc 3.6L SOHC (1990)
Brake Bleeding: Service and Repair
REPLACING BRAKE FLUID / BLEEDING BRAKES AND LOCK CONTROL
General Information
Since brake master cylinder circuits, consisting of the push rod circuit (for front axle) and intermediate piston circuit (for rear axle) with the ABS
hydraulic control unit, are completely independent of the booster circuit (brake booster and lock control), brake fluid replacing and bleeding
procedures are divided into different jobs.
Information
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Use only new brake fluid DOT 4.
Total brake fluid change quantity approx. 1.6l.
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Brake fluid change interval and fluid grade have been modified as of MY 93.
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The brake fluid reservoir is subdivided into chambers approx. as from the middle section downwards.
Procedure/subdivision
1. Brake fluid change (brake, lock control and clutch) / Bleed brake master-cylinder circuits*.
2. Bleed lock cylinders and pressure lines insofar as the hydraulic system was opened after the valve block for lock actuation.
3. Bleed the lock or brake booster circuit insofar as parts of the booster circuit were replaced or if the system (also suction side of the pump
assembly) was opened.
