Power Steering Fluid.

• 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.

525i
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.

535i
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 cap.
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.

Without sel-leveling rear suspension (LAD): 1.2 liters – 1.3 quarts

With sel-leveling rear suspension (LAD): 1.8 liters – 1.9 quarts