Bosch DSC 3.X User Manual download pdf (Page 21)

Introduction to DSC

Hydraulic Charge

Existing ASC+T and DSC II systems already perform hydraulic control regulation but do not

require the additional charge pump systems. Why? The reason being those systems only

actuate the rear axle circuits. Obviously, the DSC III system has the capability to actuate

front and rear axle circuits together which requires additional hydraulic fluid supply.

For this reason, during an ASC or DSC regulation function requiring hydraulic interven-

tion, the DSC III control module switches the electrical charge pump on to provide this addi-

tional fluid.

740i/iL & 540iA Vehicles:

When activated, the Charge Pump delivers a brake pressure of 10 - 15 bar to the front axle

circuit of the hydraulic unit and into the front axle circuit pressure chamber of of the master

cylinder. The master cylinder piston for the front axle circuit contains a notched restrictor

forward of the central valve which allows excess fluid to return to the reservoir under a

restriction.

The pressurized fluid also acts on the rear axle circuit of the master cylinder. This provides

the hydraulic charge to the rear axle circuit of the hydraulic unit as needed.

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Bosch DSC 3.X User Manual Page 21