Mercedes-Benz E430 4MATIC
Report: Squeak in Steering Column Due to Rubber Boot or Seal
Mercedes-Benz E430 4MATIC Problem
A squeak from the steering column is often related to a rubber boot in the column or a seal in the power steering rack.
Visitor, 2001 Mercedes-Benz E430 4MATIC, 25,000 mi
The dealer changed this rubber boot and the entire steering gear under warranty. They said it was out of spec, but I doubt it. The rubber boot still squeaks occasionally and I ignore it. A squirt of silicone would quiet it. I have 130,000 miles on my car and am very happy with it.