Seat Leon >> Pre-bleeding hydraulic system

Note

  • Bleeding of the brake system is described using brake filling and bleeding equipment - VAS 5234- with adapter - VAS 5234/1- .
  • A pressure of at least 2 bar is required to bleed the ABS hydraulic unit - N55- .

Changing brake fluid

Special tools and workshop equipment required

  • Brake filling and bleeding equipment - VAS 5234- adapter - VAS 5234/1-

Brakes - hydraulics

  • Tool set for brake bleeding - VAS 6564-

Brakes - hydraulics

Carry out pre-bleeding:

  • if a chamber in the brake fluid reservoir in vehicles with EDL, EDL/TCS or EDL/TCS/ESP is completely empty. This can happen if a leak should occur in the brake system.

 

  • Connect brake filling and bleeding equipment - VAS 5234- .

Bleeding sequence:

  1. - Bleed front left and front right brake callipers simultaneously.

Brakes - hydraulics

  1. - Bleed rear left and rear right brake callipers simultaneously.
  • Leave bleeder valves open with brake fluid hoses connected until brake fluid free from air bubbles flows out.

Hydraulic unit must then be bled again by means of the function "Basic setting" with the - Vehicle diagnostic tester.

Initiate basic setting (to bleed brake system): Connect - Vehicle diagnostic tester and select function.

  • Then bleed brake system as normal.

Brakes - hydraulics

    General notes on brake fluid
    Note Always use fresh brake fluid. In case of brake fluid spillage, rinse with a copious amount of water. DANGER! Before performing the first test drive, make sure that the brakes ...

    Bleeding hydraulic system following standard procedure
    Note Bleeding of the brake system is described using brake filling and bleeding equipment - VAS 5234- with adapter - VAS 5234/1- . A pressure of at least 2 bar is required to bleed the ABS h ...

    See also:

    Subsequent bleeding of hydraulic system
    Carry out subsequent bleeding when: brake pedal travel is too long or so-called "soft brake pedal" Subsequent bleeding requires the assistance of a second mechanic. Depress brake pedal firm ...