Bleeding Brake System: Notes
NOTE:
Ensure fluid level in master cylinder reservoir is adequate at all times during bleeding procedure. Use only DOT 4 brake fluid. DO NOT use DOT 5 silicone fluid.
NOTE:
On S420 and S500, disconnect 2-pin electrical connector for master brake cylinder switchover valve on brake master cylinder. Remove fuse No. 28 from fuse box located next to master cylinder. Using a jumper wire, connect Gray/Green wire from switchover valve to power supply for fuse No. 28 in fuse box. Using another jumper wire, connect Yellow/Green wire from switchover valve to ground. Ensure switchover valve is energized during brake bleeding procedure.