CAUTION: In the event of replacing any component upstream of the hydraulic control box (HCU), including the HCU itself, it is necessary to bleed the brake system using the appropriate T4 procedure to ensure that the air is completely bled from the new part (details).
NOTE: The procedure below is for bleeding the entire brake system. If the performed operations affected only one of the circuits of the brake system - the main or auxiliary one, then only this circuit is pumped. Partial bleeding of the brake system is permitted only if there is minimal loss of brake fluid when the brake pipe or hose is disconnected.
1.
WARNING: It is forbidden to carry out work on a vehicle standing on only one jack. Always support the vehicle with jack stands.
Raise and support the vehicle.
2. Make sure all brake connections are tight and there are no signs of leaks.
3. Release 3 clips and remove cover.
4.
CAUTION: Do not allow dirt or foreign liquids to enter the reservoir. Use only fresh brake fluid from a hermetically sealed container that meets specifications. It is forbidden to mix different brands of brake fluid due to their possible incompatibility.
CAUTION: Brake fluid, if it comes into contact with the paintwork, may damage it. If you spill coolant, remove it immediately and flush the area with water.
Add brake fluid to the reservoir up to the MAX mark.
5. Place a bleeder tube on the brake caliper bleeder and immerse the end of the bleeder tube in a suitable container containing a small amount of the prescribed brake fluid.
6. Start with the brake caliper furthest from the master cylinder: Loosen the bleeder screw half a turn.
7.
ATTENTION: During the entire bleeding procedure, the reservoir of the hydraulic brake drive must be constantly filled with new, clean brake fluid.
Fully depress the brake pedal evenly and allow it to return to its original position. Repeat the procedure until clean brake fluid without bubbles begins to flow into the container.
8.
WARNING: After bleeding, do not forget to put the cap on the bleeding fitting. This will protect the bleeder fitting from corrosion.
With the brake pedal fully depressed, tighten the bleed screw (tightening torque 10 Nm).
9. Add brake fluid to the reservoir up to the MAX mark.
10.
WARNING: An incorrect sequence of bleeding the brake system can seriously affect braking performance.
Repeat the bleeding procedure for each brake caliper.
11. Use T4 to bleed air from the brake system.
12. Depress the brake pedal and check for leaks.
13. Install the cover.
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