how to address a BMW 5 Series steering system that has lost assist?

Solution

1. Preparation

• Gather necessary tools and equipment.
• Ensure the vehicle is on a level surface and secure it with wheel chocks.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Power Steering Fluid

• Sub-steps:
  1. Remove the power steering fluid reservoir cap.
  2. Inspect the fluid for color and contamination (should be clear, not dark or foamy).
  3. If contaminated, use a turkey baster to remove old fluid.
  4. Refill with manufacturer-recommended power steering fluid (check owner's manual).

Tools Required: Turkey baster, funnel

3. Check for Leaks and Replace Components

• Sub-steps:
  1. Visually inspect power steering lines and connections for leaks.
  2. If leaks are found, replace damaged hoses or components.
  3. Remove the old power steering pump if it's defective (locate the mounting bolts, disconnect electrical connectors, and remove the pump).
  4. Install the new power steering pump and tighten mounting bolts to manufacturer specifications.

Tools Required: Socket set, wrench set

4. Replace the Serpentine Belt

• Sub-steps:
  1. Loosen the tensioner using a belt tensioner tool or wrench.
  2. Remove the old serpentine belt carefully.
  3. Install the new serpentine belt following the routing diagram (usually located on a sticker in the engine bay).
  4. Reapply tension and ensure the belt is seated properly on all pulleys.

Tools Required: Belt tensioner tool, socket set

5. Final Checks and Reassembly

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Start the engine and let it idle while checking for leaks around the power steering system.
  3. Turn the steering wheel from lock to lock to bleed air from the system.
  4. Recheck fluid level and top off if necessary.

Tools Required: None additional