Pic. 9.25. Removing the brake master cylinder: 1 - pin connector; 2 - supply tank; 3 - cotter pin; 4 - brake pipes; 5 - nuts
- disconnect pin 1 (see fig. 9.25) brake fluid level sensor;
- unscrew the cap of the supply tank 2;
- pump out the brake fluid from the supply tank with a syringe;
- unscrew the bleed valves on all brake mechanisms so that when you press the brake pedal, brake fluid comes out of them;
- depress and release the brake pedal until brake fluid stops coming out of each valve.
Fill hydraulic brake fluid in the following order:
Attention! Use only fresh brake fluid of the recommended grade or DOT4 brake fluid grade.
- replace the brake fluid by bleeding the hydraulic drive of all brake mechanisms in the sequence indicated below;
- when pumping the hydraulic drive, make sure that the required level is maintained in the supply tank and constantly add brake fluid to it.
Remove air from the hydraulic drive in the following order:
- front left wheel;
- front right wheel;
- rear left wheel;
- rear right wheel.
After carrying out work with the removal of the brake mechanism, bleed the hydraulic drive in the following order:
- brake mechanism, which was removed;
- front left wheel;
- front right wheel;
- rear left wheel;
- rear right wheel.
Note. When removing and installing the master brake cylinder, it is recommended that automatic bleeding be completed manually.
Vehicles equipped with ABS
Note. Hydraulic units are supplied filled with brake fluid.
If manual or automatic bleeding of the hydraulic system of the brake system with ABS does not give the desired results, bleed using the diagnostic tool TEP 92, DIAG 2000, following the instructions attached to it.
All cars
- - connect one end of the transparent tube to the air bleed valve, lower the other end into a transparent container filled with brake fluid;
- slowly press the brake pedal;
- keep the brake pedal depressed, while your assistant must unscrew the valve for pumping - part of the brake fluid will pour into the container;
- close the bleed valve after the pedal hits the floor;
- release the brake pedal;
- repeat the operations carried out until a clean brake fluid that does not contain air bubbles begins to flow out;
- perform the same operations on the remaining brake mechanisms in the sequence indicated above.