Replacing a Hydraulic Cylinder Seal

  • 2-3 hours
  • Advanced
  • 35-50
What You'll Need
Floor Jack
Jack Stands
Tire Iron
Drain Pan
3/8 Inch Socket
Flathead Screwdriver
Replacement Seal Kit

A hydraulic cylinder seal on a vehicle is of vital importance to the suspension. If there is a problem with the hydraulic cylinder seal, the cylinder will not be able to hold any pressure. Thus, the vehicle will not ride very well and the suspension will sag. Here are the steps to take to replace the hydraulic cylinder seal.

Step 1: Raise the Rear of the Car

Park the vehicle on a flat surface. Raise the back end of the vehicle with the floor jack and secure it with two jack stands.

Step 2: Remove Tire

With the tire iron, remove the tire on the side where the hydraulic cylinder seal is failing.

Step 3: Drain Hydraulic Fluid

Locate the cylinder on the suspension behind the wheel assembly. Place a drain pan under the cylinder and remove the collar with your hands. Unbolt the cylinder from the lower control arm and remove the top of the cylinder shaft to expose the seal. Let the fluid drain out into the pan.

Step 4: Replace Seals

Take note of which seals you are removing within the cylinder. This will ensure that there are no problems with the replacement. Lift out the old seals with a screwdriver and clean and remaining residue from the cylinder. Replace with new ones from the kit. Place the shaft back in the cylinder and tighten the bolt. Connect back to the lower control arm and replace the tire.