Bleeding The Steering System - Porsche 996 TT Repair Manual

on one side and the "Hot max" symbol on the other side.
Pentosin reservoir
Check the fluid level (Pentosin CHF 11 S) with the engine stationary and cold (approx. 20 °C).
CAUTION
Danger of damage to property if too much Pentosin CHF 11 S is filled or if it comes in contact with the
coolant hoses when topping up or filling in!
• Observe the following specifications in order to avoid overfilling and thus overflowing!
• Multiple steering operations (manoeuvring) and/or actuating the clutch with the engine switched off
change the fluid level in the reservoir! Fluid level rises. In this case, the engine must be run for
approx. 20 seconds immediately prior to the fluid level check!
• If coolant hoses come into contact with Pentosin, thoroughly clean them with water
IMMEDIATELY!
• Replace visibly swollen coolant hoses!
1. Start engine and run it at idle speed for approx. 20 seconds. Switch off engine.
2. Open the engine cover.
3. Open reservoir cap.
4. Wipe off the dipstick. Close and then reopen the cap. The fluid level should be in the designated "Cold
range" (min./max. level at 20 °C). Top up with Pentosin if necessary. Do not add too much Pentosin! In
warmed−up condition, the fluid level must not exceed the "Hot max" mark!
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Bleeding the steering system

1. To fill the whole system after the installation of new steering components or lines or after a
substantial loss of hydraulic fluid, briefly start the engine a few times and, when it fires, switch it
off again immediately. This procedure causes the fluid level in the reservoir to fall rapidly, so
constantly add Pentosin CHF 11 S. The reservoir must not be sucked dry.
2. If the fluid level in the reservoir does not fall any further when the engine is briefly turned over, start the
engine and let it run at idling speed.
3. Rapidly turn the steering wheel from stop to stop several times so that the air can escape from the
cylinders. At the end positions of the piston, do not pull the steering wheel with more force than is
necessary in order to turn the steering (to prevent unnecessary build−up of pressure initially).
4. Observe fluid level during this procedure. If it continues to fall, add fluid until the level in the
reservoir remains constant and no more air bubbles rise in the reservoir when the steering wheel is
Checking hydraulic fluid of power steering and servo clutch
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