Test And Assembly Work On Power Steering; General; Checking Hydraulic Fluid Of Power Steering And Servo Clutch - Porsche 996 TT Repair Manual

48 Test and assembly work on power steering

General

Checking hydraulic fluid of power steering and servo clutch

Bleeding the steering system
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General
Damage to the power steering is caused by a shortage of oil in the hydraulic system. Even small leaks can
cause the fluid to escape and damage the servo pump as a result of the high oil pressure occurring in the
hydraulic circuit.
Grunt−like noises when the steering is locked or foam formation in the reservoir indicates a shortage of oil
and/or that air has also been sucked in. Before filling the reservoir, any existing leaks must be eliminated on
the suction side. Alternatively, the defective part on the pressure side should be replaced.
Power steering and clutch operation are supported by hydraulic auxiliary forces. The common reservoir −A−
is located in the engine compartment.
Only Pentosin CHF 11 S may be filled into the reservoir. Pentosin CHF 11 S can be ordered with the
following part number: Quantity supplied 1 litre = 000.043.203.33.
Note
• There is a second tank in the luggage compartment for clutch operation. This container is located
under a cover!
Rack−and−pinion steering gear and servo pump must not be repaired or dismantled!
•
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Checking hydraulic fluid of power steering and servo clutch
Note
• Power steering and clutch operation are supported by hydraulic auxiliary forces!
• The reservoir is located in the engine compartment!
• The dipstick located on the reservoir cap has the "Cold marking" (approx. 20 °C engine temperature)
48 Test and assembly work on power steering 304