Dsc III Hydraulic System Components

As mentioned at the beginning of this section, there are minor differences in the hydraulics for the 750iL compared with the 740i/iL and 540iA. The following components are the same for either variation of the system:

Hydraulic Unit:





^ Similar to DSC II hydraulic unit
^ Modulates brake pressure during ABS, CBC, ASC and DSC control procedure.
^ Contains:
- 1 pump motor
- 2 return reciprocating pumps
- 2 preload valves
- 2 changeover valves
- 2 accumulator chambers
- 2 damper chambers
- 4 inlet valves
- 4 outlet valves

Master Cylinder:
Master cylinder, fluid reservoir and level switch. All to ensure sufficient brake fluid supply is always available to the hydraulic unit during ASC/DSC hydraulic regulation, the system requires an additional pumping system not equipped on any previous ASC+T system.
The pumping systems are different on the 750iL compared with the 740i/iL & 540A and are as follows:

^ 740i/iL & 540iA = Charge pump - located next to the master cylinder.





^ 75OiL = Pre-boost pump and separate charge piston. These components are also mounted next to the brake fluid master cylinder and fluid reservoir.