Note: Please be aware of the warnings at the beginning of the paragraph 2, about the dangers of brake fluid.
1. If any tube or hose is to be replaced, minimize brake fluid loss by removing the master cylinder reservoir cap, covering the reservoir neck with a piece of plastic wrap and sealing with a rubber band. Alternatively, flexible hoses can be pinched with a suitable clamp if necessary, and metal pipe connections must be plugged (if measures are taken to prevent dirt from entering the brake system) or close the lids immediately after disconnection. Place a piece of cloth under the connection you are about to disconnect to keep the spilled liquid from spreading.
2. If you are disconnecting a flexible hose, first unscrew the union nut, then remove the hose retaining spring clip.
3. To unscrew the union nuts, it is recommended to have a special wrench for disassembling the brake pipes of the required size. In the absence of a special wrench, an ordinary open-end wrench can be used, although if the nuts are tight or rusted, their edges can be damaged if the wrench breaks. In this case, often the only way to loosen a tight connection is to use a self-tightening wrench, but this will ruin the tube and nut, after which they will have to be replaced. Always clean the fitting and the area around it before disconnecting. When disassembling an assembly with more than one fitting, mark the connections for proper reassembly.
4. If it is necessary to replace the brake pipe, Mercedes-Benz supplies its sales representatives with pipes cut to size, with ferrules and nuts. The only thing left for the owner to do is to bend it according to the pattern of the tube being replaced. Alternatively, most parts stores can make this tube to your specifications from kits. But this requires knowing the exact length of the tube. Therefore, present the original tube to the shop as a sample.
5. When installing, do not overtighten the union nuts. To get a reliable connection, there is no need to exercise in the development of superhuman strength.
6. Check that the pipes and hoses are routed correctly without kinks and that they are secured with appropriate clamps and brackets. After installation, remove the polyethylene from the reservoir and bleed the hydraulic system as described in paragraph 2. Wash off all traces of fluid and check for leaks at the connections.
7. At the end, before leaving on the road, thoroughly check the operation of the brake system.