A DIY Guide to Replacing a Rear Suspension Bumper
Suspension bumpers are installed in cars—particularly lowered ones—to prevent suspension parts from colliding with these cars' body or wheel wells. Also known as bump stops, these tubular or triangular pieces of rubber or polyurethane protect cars from bottoming out. Over time, suspension bumpers can wear out and need replacement because they absorb impacts and often rub against other parts. You can change worn suspension bumpers by yourself to save money on auto repair. This step-by-step guide below will teach you how to change a rear suspension bumper:
Difficulty level: Moderate
Things you'll need:
- New suspension bumpers
- Socket set
- Axle stands
- Wheel chocks
- Flat-bladed screwdriver
- Mole grips
- Cranked spanner
- Some dishwashing liquid
- Two 16mm bolts
- One 21mm bolt
Step 1: Find out if your car is equipped with factory suspension bumpers like most cars. Suspension bumpers are installed either on top of the control arms, onto the shock piston, or close to the suspension springs. If you can't find the suspension bumpers on these locations, inspect the other side of your car.
Step 2: Put your car in gear or in Park and place wheel chocks against its front wheels. Then, jack up the rear of your car and prop it up with axle stands.
Step 3: Remove the wheel in the rear of your car.
Step 4: Using a socket, take out the two 16mm bolts that secure the shock absorber in the top mount. Then, remove the 21mm bolt that locks the shock absorber's bottom to the hub.
Step 5: Pull out the whole shock absorber assembly from your car.
Step 6: Take out the dust cover at the top of the shock absorber by using a flat-bladed screwdriver.
Step 7: Grasp the shock absorber's end by using mole grips, and loosen the 16mm nut using a cranked spanner so that you can take out the sleeve from the shock absorber. Remove the loosened 16mm nut with your fingers.
Step 8: Take out the sleeve from the shock absorber, complete with what remains of your worn suspension bumper.
Step 9: Grip your worn suspension bumper and twist it to take it out from the top mount. Pull out the other end of the suspension bumper from the plastic sleeve.
Step 10: Push your new suspension bumper into place in the sleeve and the top mount by using some dishwashing liquid as lubricant.
Step 11: Reconstruct the shock absorber unit by reinstalling the 16mm nut and holding the shock absorber's center pin with mole grips.
Step 12: Return the dust cover back onto the top of the shock absorber assembly. Then, reinstall the shock absorber into your car. Be sure to use new 16mm bolts for the top mount and a new 21mm bolt for the shock absorber's bottom. To prevent the bolts from coming loose, apply threadlocker on them.
Step 13: Reinstall the wheel.
Step 14: Perform steps 3-13 to the other side of your car's rear.
Carrying out this replacement procedure for rear suspension bumpers will take you about one hour.