Removal and installation of hydraulic unit (A7) - RA42001240705X(42-0705)
Operation no. of operation texts and work units or standard texts and flat rates: 42-0125
Notes on hydraulic unit
The two relays (A7K1 and A7K2) governing the solenoid valves and pump motor can be replaced individually (42-0710) . Do not attach the hydraulic unit directly to the body, as excessive noise would result.
| Ground cable | disconnect, connect at the battery. | |
| Brake line (2 to 6) | unscrew, screw on. Immediately seal connections and brake lines with blind plugs 129 589 00 91 00. When installing, do not interchange brake lines. Identification on the hydraulic unit: V = from stepped tandem brake master cylinder, front axle brake circuit (2) H = from stepped tandem brake master cylinder, rear axle brake circuit (3) I = from hydraulic unit to left front wheel brake (5) r = from hydraulic unit to right front wheel brake (4) h = from hydraulic unit to rear wheel brake (6) Tightening torque 14 Nm. |
|
| Torque wrench | 001 589 72 21 00 | |
| Open box wrench socket | 000 589 75 03 00 | |
| Torx hexagon socket screw (8) | detach and remove cover. | |
| Grounding strap (14) | unscrew, screw on. | |
| Harness stress relief (12) | detach and remove plug (13). | |
| Hexagon nuts (10) | unscrew, or, on Model 202, remove rubber caps. Then remove hydraulic unit (A7). | |
| When installing the hydraulic unit | ensure that it does not contact the body (noise).
NOTE:
Note the following for the hydraulic unit.
|
|
| After installing the hydraulic unit | bleed system and check for leaks (42-0010 and 42-0015). | |
| Test program | perform (42-0720). Read out and then erase fault memory (Model 124.034, 129.058/063, 140, 202) according to instructions in Chassis Diagnosis Manual, Volume 2. | |
Special tools