Warning! The fluid used in the hydraulic circuit of the brake system is highly toxic and chemically aggressive. Avoid contact of brake fluid with eyes and painted surfaces of body panels. In addition, the brake fluid is highly hygroscopic, so it is unacceptable to use it after long-term storage in an open container. Excessive moisture content can significantly reduce braking performance.
1. The procedure for performing the procedure is similar to that described in Chapter Brake system for bleeding the brake system, with the amendment that the GTZ reservoir must first be emptied with a syringe or a rubber bulb.
2. Open the caliper/wheel cylinder bleed valve of the first brake (see chapter Brake system), then pump out the brake fluid present in the GTZ with a few smooth pressures on the foot brake pedal.
3. Top up the reservoir to the MAX mark and repeat pumping until the brake fluid is completely replaced (fresh fluid should begin to flow through the valve). Tighten the valve and refill the tank to the maximum mark.
Note. Old brake fluid is usually noticeably darker in color than fresh fluid, so the procedure should not be too difficult.
4. Repeat the procedure in turn for each of the remaining calipers / wheel cylinders - make sure that the fluid level in the GTZ reservoir does not fall below the MIN·mark in order to avoid air being sucked into the system, which can significantly increase time and effort.
5. Upon completion of the procedure, make sure that the bleed valves are securely tightened. Don't forget to put protective caps on the valves. Clean up all traces of spilled brake fluid and recheck the level in the GTZ reservoir.
6. Before starting the operation of the car, make sure that the brakes are working properly.