Brake system (hybrid)

Subsequent bleeding of hydraulic system

~1min read
Note

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.

  • Connect brake filling and bleeding equipment -VAS 5234-.
  • Depress brake pedal firmly and hold.
  • Open bleeder valve on brake caliper.
  • Fully depress brake pedal.
  • Close bleed valve with pedal held down.
  • Release brake pedal slowly.
Note

This bleed sequence must be carried out 5 times per brake caliper.

1 - Front left brake caliper
2 - Front right brake caliper
3 - Rear left wheel brake cylinder
4 - Rear right wheel brake cylinder
5 - Brake system pressure accumulator -VX70-, LHD vehicles
Use suitable bleeder hose. It must sit tightly on bleeder valve so that no air can enter brake system:
  • Leave bleeder valve of each brake caliper open with bleeder hose fitted until brake fluid discharges free of air bubbles.
Note A road test must be carried out after the brakes have been bled. When doing this an ABS regulation must be performed at least once!
Subsequent bleeding of hydraulic system

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