Seat Leon >> Exploded view - control unit and hydraulic unit

Exploded view - control unit and hydraulic unit, LHD

Anti-lock brake system

  1. - ABS control unit - J104-
    • Do not unplug connector before completing self-diagnosis
    • Switch off ignition before detaching connector
  2. - ABS hydraulic unit - N55-
  3. - Torx bolt
    • Tighten the new Torx screws alternately in two stages:
    • Stage 1: initial tightening torque: 1 Nm with 1.5 Nm (to allow the seal to settle)
    • Stage 2: final specified torque: 2.5 Nm
  4. - Brake pipe
    • To the rear right brake calliper
    • Markings: Ø 5.25 mm and union nut with thread M 12 x 1
    • 14 Nm
  5. - Brake pipe
    • To front left brake caliper.
    • Markings: Ø 5.25 mm and union nut with thread M 10 x 1
    • 14 Nm
  6. - Brake pipe
    • To front right brake caliper.
    • Markings: Ø 5.25 mm and union nut with thread M 12 x 1
    • 14 Nm
  7. - Brake pipe
    • To the rear left brake calliper
    • Markings: Ø 5.25 mm and union nut with thread M 10 x 1
    • 14 Nm
  8. - Brake pipe
    • Master brake cylinder / pressure-rod piston circuit to hydraulic unit
    • Markings: Ø 6 mm and union nut with short thread M 12 x 1
    • 14 Nm
  9. - Brake pipe
    • From secondary piston circuit of brake master cylinder to hydraulic unit.
    • Markings: Ø 6 mm and union nut with short thread M 12 x 1
    • 14 Nm
  10. - Brake servo unit
  11. - Support
  12. - Torx bolt
    • 8 Nm
  13. - Rubber damper
    • 3 off
  14. - Heat shield
    • Assignment - Electronic parts catalogue
  15. - Hexagonal nut
    • 20 Nm
  16. - Support
  17. - Hexagonal nut
    • 20 Nm

WARNING

Do not bend the brake lines.

Any damaged brake lines must be renewed.

Exploded view - control unit and hydraulic unit, RHD

Anti-lock brake system

  1. - Brake pipe
    • From secondary piston circuit of brake master cylinder to hydraulic unit.
    • Markings: Ø 6 mm and union nut with short thread M 12 x 1
    • 14 Nm
  2. - Brake pipe
    • Master brake cylinder / pressure-rod piston circuit to hydraulic unit
    • Markings: Ø 6 mm and union nut with short thread M 12 x 1
    • 14 Nm
  3. - Brake pipe
    • To the rear right brake calliper
    • Markings: Ø 5.25 mm and union nut with thread M 12 x 1
    • 14 Nm
  4. - Brake pipe
    • To front left brake caliper.
    • Markings: Ø 5.25 mm and union nut with thread M 10 x 1
    • 14 Nm
  5. - Brake pipe
    • To front right brake caliper.
    • Markings: Ø 5.25 mm and union nut with thread M 12 x 1
    • 14 Nm
  6. - Brake pipe
    • To the rear left brake calliper
    • Markings: Ø 5.25 mm and union nut with thread M 10 x 1
    • 14 Nm
  7. - ABS hydraulic unit - N55- with ABS control unit - J104-
  8. - Support
    • Check for secure seating after installing
  9. - Bolt
    • 2 off
    • 8 Nm
  10. - Rubber damper
    • 3 off

WARNING

When installing the bracket, ensure that the rubber dampers are not pressed out of the console.

After installation, check that the ABS hydraulic unit - N55- is firmly seated, or malfunction can occur.

  1. - Nut
    • 20 Nm
  2. - Support
  3. - Nut
    • 2 off
    • 20 Nm
  4. - Brake servo and brake master cylinder
  5. - Brake pipe
    • Master brake cylinder / pressure-rod piston circuit to hydraulic unit
    • Markings: Ø 6 mm and union nut with short thread M 12 x 1
    • 14 Nm
  6. - Brake pipe
    • From secondary piston circuit of brake master cylinder to hydraulic unit.
    • Markings: Ø 6 mm and union nut with short thread M 12 x 1
    • 14 Nm
    Removing and installing ABS control unit - J104- / ABS hydraulic unit - N55-
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