- Clean syringe
- 19mm combination wrench or 8mm hex key
- New crush washer
- Pan to collect the old fluid
- Clean rags and catch pan
It is not really possible to bleed the PS system completely
(only 60%) without applying vacuum to the reservoir.
The PS pump drain plug on the 525i M50 is not accessible (the
oil pan is on the way) unless you remove the pump from the
bracket. So Joseph R. decided to unbolt the 2 banjo
bolts connecting the 2 hoses to it instead (one is larger
than the other). Most of the fluids came out from the bigger
bolt, not much from the smaller one. He managed to drain 24
ounces of fluid with this procedure.
1. Remove fluid from the reservoir using the syringe.
Place the pan under the car then remove the 19mm bolt holding
the reservoir hose to the PS pump.
(There is a 8mm hex drain plug on the PS pump, but it was
hidden behind the bracket and I didn't feel like removing
the whole pump.)
530i - 540i
1. Place the pan under the car then remove the 8mm hex drain
plug on the PS pump. Let the fluid drain in the pan then replace
the drain plug.
2. Clean the inside of the reservoir with clean rags and
fill it up with the correct fluid type to the MAX level or
25mm (1 in.) below the reservoir rim if you don't have a dipstick
3. Start the engine then slowly turn the steering wheel from
lock to lock two times to bleed the air in the system.
4. Shut down the engine then check the fluid level and add
if necessary. LAD equipped cars, raise the rear wheels off
the ground, wait 2 min then check the fluid level.