Porsche 928 - WORKSHOP MANUAL 1977 Workshop Manual page 250

47
Brakes/Hydraulic, Regulator, Booster
928
8. Now
set lever to leak test.
The pressure value dis-
played on the operating pressure gauge must not
drop during the next 5 minutes.
There is a leak in the brake or clutch system, if
pressure does drop during the test time.
9. Install dust caps on bleeder valves. Draw off brake
fluid in tank. which is higher than the MAX mark.
Install strainer and screw on brake fluid tank cap.
a
47.24 Bleeding Brakes/Replacing Brake Fluid
Printed in Germany