Hydraulic brake drive — bleeding (Vesta 2180)

The hydraulic drive of the brake system is bled after repairs related to a breach in the tightness of the brake system and if there is a suspicion of air entering the system. In the latter case, you should first determine and eliminate the cause of air entering the hydraulic drive and only then begin bleeding it. The presence of air in the hydraulic drive of the brake system can be determined by the "behavior" of the brake pedal - it becomes "soft" (when pressing the pedal, there is no feeling of support at the end of its stroke) and the pedal stroke increases (the pedal moves below its normal position). Bleed the brake mechanisms in the following sequence: right rear, left front, left rear, right front.

To perform the work you will need a transparent vinyl tube with an internal diameter of 4-5 mm, special keys of 7 and 8 mm for the pipe fastening fittings, a container for draining the brake fluid, new brake fluid recommended by the manufacturer, an inspection ditch or overpass.

We perform the work with an assistant.

Sequence of execution

1. Prepare the car for work (see "Preparing the car for maintenance and repair").

2. Remove the master brake cylinder reservoir cover.

Warning! To prevent air from entering the hydraulic drive of the brake system during bleeding, make sure that the brake fluid level in the reservoir does not fall below the MIN mark.

3. Using a rag, clean the nipple of the rear right wheel brake cylinder and the surface around it from dirt.

4. Remove the protective rubber cap from the bleed nipple.



5. Put a special wrench or a 7 mm open-end wrench on the bleed nipple...



...and then a clear vinyl tube. We lower the other end of the tube into a transparent container partially filled with brake fluid.



6. The assistant presses the brake pedal 3-5 times and holds it pressed.



7. Unscrew the bleed nipple until liquid starts to come out of it.

8. After the brake fluid stops coming out of the tube, tighten the nipple.

9. Repeat the steps described in paragraph. 6-8, until the brake fluid with air bubbles stops coming out of the cylinder nipple, periodically checking the brake fluid level in the reservoir of the main brake cylinder, after which we finally tighten the bleed nipple to a torque of 6 Nm.

10. Remove the vinyl tube and key from the bleed nipple and put a protective rubber cap on it.

11. Next, remove the cap...



...and we bleed the brake cylinder of the front left wheel.



12. Similarly, bleed the cylinders of the rear left and front right brake mechanisms in the specified order, monitoring the fluid level in the reservoir of the main brake cylinder.



13. By pressing the brake pedal, we check the operation of the hydraulic drive and the absence of fluid leakage from the fittings. If the pedal is "soft" or it moves below its normal operating position, we recheck the tightness of the brake system and repeat bleeding the hydraulic drive.

14. Check and, if necessary, top up the fluid level in the master brake cylinder reservoir (see "Checking the brake fluid level").