Hydraulic block N55 with used L 04 1. ABS hydraulic unit -N55- used ABS -L 04-. The hydraulic unit N55 and the control unit L 04 cannot be separated. Installation location: in motor. compartment on the front left. Hydraulic unit -N55- with integrated brake pressure sensor. The G201 system and the control unit -L 04- form a hydraulic control unit. Block components cannot be separated. Do not disconnect the plug connector until the self-test is completed. Before disconnecting the plug connector, turn off the ignition. Brake pressure sensor system -G201- is integrated into the hydraulic unit -N55- and cannot be replaced; 2. ESP bracket. It is prohibited to remove the bracket.; 3. Plug connector of control unit L 04; 4. Brake line to master cylinder. 14 Nm; 5. Brake line to master cylinder. 14 Nm; 6. Brake lines. Connects the hydraulic unit and the front right brake. caliper, 14 Nm. Connects the hydraulic unit and the front left brake. caliper, 14 Nm. Connects the hydraulic unit and the rear left brake. caliper, 14 Nm. Connects the hydraulic unit and the rear right brake. caliper, 14 Nm
Removal
Read and write control unit modification. Use diagnostic for this. complex -VAS 5051B- or -VAS 5052-. Disconnect the battery, while taking into account the coding of the radio. Place spacer -VAG 1869/2- between the brake pedal and the driver's seat and press the brake pedal at least 60 mm.
Thanks to this, the main brake valves. cylinders are closed, and the brake reservoir. liquid does not remain empty. Connect the hose of the bleeder container to the bleeder fitting of the front left brake. calipers Connect the bleeder hose to the rear left brake bleeder fitting. calipers Open the front left and rear left brake bleeder fittings. pressure relief caliper in the hydraulic unit -N55-. Close the front left and rear left bleeder fittings. Spacer. VAG 1869/2 - do not remove.
Move the lock -1 - of the plug connector of the control unit to the lower position. Slide the locking bracket -in the direction of the arrow- and disconnect the plug. Make sure that brake fluid does not get into the control unit connector housing. This can lead to corrosion of the contacts and, as a result, system failure.
Thoroughly clean the contaminated plug housing with compressed air. To collect the exhaust brake. fluid, just place a lint-free cloth in the area under the used -L 04- and the hydraulic unit -N55-. Mark the brake. lines for subsequent installation. Unscrew the brake mounting bolts. lines running from the N55- hydraulic unit to the brake master cylinder. Unscrew the bolts securing the remaining brakes. lines -arrows- from the hydraulic unit -N55-.
Close the brake. lines and threaded holes with plugs from the repair kit. Carefully lift the hydraulic unit -N55- from the used one -L 04- upwards from the bracket. When removing the ESP control unit from the bracket, make sure that the rubber stops do not fall into the engine. compartment. Place the hydraulic unit -N55- with the used one -L 04- down on a clean, level surface. After removing the control unit -L 04- and the hydraulic unit -N55-, the threaded holes and the brake must be sealed with plugs. highways.
Installation
Install in the reverse order; note the following: To carry out servicing, the hydraulic unit -N55- must be filled with brake fluid. liquid. The plugs on the new hydraulic unit -N55- must only be removed when the corresponding brake line has been installed. If before installing the appropriate brake. If the line plugs are removed from the hydraulic unit -N55-, brake fluid will leak out. In this case, sufficient bleeding of the brakes is required. systems are not guaranteed. All rubber stops must be inserted into the bracket. Press downwards on the hydraulic unit -N55- from the used one -J104- into the bracket. When installing
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