9-3 Viggen Coupe (9400) L4-2.3L Turbo (B235) HO (1999)
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Vacuum Pump: Description and Operation
Mechanical Pump
The pump is a ring pump which is mounted on the cylinder head and driven by the camshaft. As the pump is connected to the camshaft, the pump
speed is half the engine speed, and a vacuum is constantly produced for the brake system.
