User Manual

Chapter 4
BOSCH HDI EDC 15C2 INJECTION SYSTEM AND PARTICLE FILTER
21
IV - VACUUM RESERVE
A - ROLE
The vacuum reserve allows sufficient braking assistance to be maintained if the
following components are controlled simultaneously:
• "Swirl" control butterfly valve,
• inlet air heater butterfly valve,
• variable geometry turbo control diaphragm.
B - DESCRIPTION
SDI005
C
e d
c
c - Vacuum pump vacuum inlet
d - Outlet: "Swirl" control butterfly valve
e - Outlet: variable geometry turbo control diaphragm
Capacity = 0.5 Litre
C - LOCATION
The vacuum reserve is located in the engine compartment, near to the brake
servo (depending on vehicle).
Note: The vacuum circuit contains 3 nozzles of 0.55 mm.
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