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Summary of components: Brake Servo Unit/Master Brake Cylinder for vehicles with ABS/EDL/ESP Mark 20 > < Change brake fluid

Octavia Mk1

Checking the master brake cylinder for tightness
Checking the master brake cylinder for tightness
Special tools and workshop equipment required
t  Brake-power regulator or brake system tester, e. g. -V.A.G 1310- or -V.A.G 1310 A-
t  Brake fluid → Chapter
t  Lithium grease -G 052 150 A2-
Test condition
l  Function and tightness of the brake system O.K.
The brake system includes:
t  Hydraulic control unit or load-dependent brake-power regulator
t  Brake lines, brake hoses and their connections
t  Brake calipers and wheel-brake cylinder
Test
–  Release the bleeder screw on one of the front brake calipers.
   
–  Connect the pressure gauge of the tester -V.A.G 1310- or -V.A.G 1310 A- and bleed.
–  Push down brake pedal until the pressure gauge on the tester indicates an overpressure of 5 MPa (50 bar).
–  Test duration 45 seconds.
–  The pressure loss must not exceed 0.40 MPa (4 bar) throughout the test.
If the pressure loss exceeds 0.40 MPa (4 bar) replace the master brake cylinder.
LHD vehicles → Chapter.
RHD vehicles → Chapter.
–  Repeat the test after replacing the master brake cylinder.
–  Disconnect the pressure gauge of the tester -V.A.G 1310- or -V.A.G 1310 A- from the brake caliper.
–  Thinly coat thread of vent valve with lithium grease -G 052 150 A2-.
–  Screw the vent valve into the brake caliper and tighten.
Tightening torque: 10 Nm
–  Bleeding brake system → Chapter.
  V47-0133

Summary of components: Brake Servo Unit/Master Brake Cylinder for vehicles with ABS/EDL/ESP Mark 20 > < Change brake fluid