Note: Before you begin, please remember the warnings stated at the beginning paragraph 2, about the dangers of brake fluid.
1. If any tube or hose is to be replaced, minimize the loss of brake fluid: remove the cap of the reserve reservoir of the master cylinder, cover the neck of the reservoir with a piece of polyethylene film and seal with a rubber band. Alternatively, flexible hoses can be clamped if necessary with a suitable clamp, and the connections of metal tubes should be plugged (if measures are taken to prevent dirt from entering the brake system) or close the lids immediately after disconnecting. Place a piece of cloth under the connection you are about to disconnect to prevent any spilled liquid from spreading.
2. If you are disconnecting a flexible hose, first unscrew the fitting nut, then remove the spring clamp securing the hose.
3. To loosen the nuts on the fittings, it is recommended to have a special wrench for disassembling brake pipes of the required size. If you do not have a special wrench, you can use a regular open-end wrench, although if the nuts are tightly tightened or rusted, their edges may be damaged if the wrench comes off. In this case, often the only way to loosen a tight connection is to use a self-tightening wrench, but it will damage the pipe and nut, after which they will have to be replaced. Always clean the fitting and the area around it before disconnecting. When disassembling a unit with more than one fitting, mark the connections for subsequent correct assembly.
4. If it is necessary to replace the brake pipe, Mercedes-Benz supplies its sales representatives with pipes cut to size, with tips and nuts. The only thing the owner has to do is bend it according to the sample of the pipe being replaced. Alternatively, most shops selling spare parts can make such a pipe according to your sample from kits. But this requires knowing the exact length of the pipe. Therefore, present the original pipe to the shop as a sample.
5. When installing, do not overtighten the nuts of the fittings. To obtain a reliable connection, there is no need to exercise superhuman strength.
6. Check that the tubes and hoses are routed correctly without kinks and that they are secured with the appropriate clamps and brackets. After installation, remove the polyethylene from the reservoir and bleed the hydraulic system as described in paragraph 2. Rinse off all traces of liquid and check for leaks in the connections.
7. Once finished, before driving on the road, thoroughly check the operation of the braking system.