A Guide to Replacing Jounce Bumpers on the 2007-2015 BMW 335i
Restore your BMW's ride quality and prevent suspension damage by replacing worn or crumbled jounce bumpers.
- Jounce bumpers are a wear item that should be replaced with your shocks and struts, as the labor is identical.
- Symptoms of failure include loud clunks over bumps and a harsh ride.
- Verify your 335i's generation (E9x vs. F30) and suspension type (Sport, xDrive, etc.) to order the correct part.
- Choose CRP/Rein for an OEM-quality replacement or Dinan for a performance upgrade with lowering springs.
Why Your 335i Jounce Bumper Matters
On a performance car like the BMW 335i, every suspension component is important for maintaining the handling and ride quality you expect. The jounce bumper, or bump stop, might seem like a simple piece of foam, but it plays a key role. Over time, these parts degrade from age, moisture, and constant use, eventually crumbling apart. A failed jounce bumper can't do its job, leading to a harsh ride and potential damage to more expensive suspension parts.
Check Your Vehicle Generation and Suspension Type
The 2007-2015 date range for the 335i covers two different generations: the E9x chassis (2007-2013 coupes/convertibles, 2007-2011 sedans) and the F30 chassis (2012-2015 sedans). These generations use different parts. Furthermore, BMW offered several suspension options like standard, Sport Package, M Sport, and xDrive (AWD), which often use different length jounce bumpers. Always verify the exact part needed for your specific vehicle's VIN before ordering.
Symptoms of a Failing Jounce Bumper
When jounce bumpers fail, the signs are often heard and felt. Because they are hidden by a dust boot, you may not see the damage until you inspect the suspension closely.
- Loud Banging or Clunking: The most common symptom is a loud "bang" or "clunk" when going over bumps, railroad tracks, or potholes. This sound, sometimes called a "pothole explosion," is the noise of your suspension bottoming out without the cushion of the bumper.
- Harsh Ride Quality: With no bumper to absorb the final impact, bumps will feel much harsher than usual, transferring more of the shock into the cabin.
- Visible Debris or Damage: If you look at the shock absorber shaft, you may see that the foam bumper is cracked, crumbling, or completely missing. The dust boot that covers it may also be torn or have fallen down.
Choosing the Right Aftermarket Jounce Bumper
For the 2007-2015 BMW 335i, you have excellent aftermarket options that can save you money over dealer parts without sacrificing quality. The choice depends on your driving style and whether you have stock or modified suspension.
Stock Replacement: CRP/Rein
If your goal is to restore the original ride and handling of your 335i, brands like CRP (which includes Rein) are a perfect choice. CRP is a well-known Original Equipment (OE) supplier for many German car brands, meaning their parts are often made to the exact same standards as the Genuine BMW parts. Forum members and mechanics trust these brands for a direct, no-fuss replacement that performs like the original.
Performance Upgrade: Dinan
Dinan is a famous BMW tuner that engineers parts for higher performance. Dinan jounce bumpers are typically shorter than stock and are designed to work with lowering springs. When you lower a car, there is less suspension travel. A shorter, more progressive Dinan bump stop allows for as much travel as possible while still preventing harsh bottoming-out, making them an integral part of a performance suspension setup. Choose Dinan if you have or are planning to install lowering springs.
Pro Tip: Replace Jounce Bumpers with Shocks and Struts
To replace the jounce bumper, the entire shock or strut assembly must be removed from the car and disassembled. This is the exact same labor required to replace the shocks and struts themselves. Because of this 100% labor overlap, it is highly recommended to replace your jounce bumpers whenever you are replacing your shocks and struts. Replacing them on their own is not cost-effective.
Cost of Replacing a BMW 335i Jounce Bumper
The part itself is inexpensive, but the labor to install it is where the real cost lies. Remember, these costs are often part of a larger shock/strut replacement job.
| Part Type | Estimated Cost (Per Pair) |
|---|---|
| New OEM | $70 - $95 |
| New Aftermarket (Your Price) | $30 - $36 |
| Shop Labor | $300 - $500 (per axle) |
Frequently Asked Questions (FAQ)
Do I need to replace jounce bumpers in pairs?
Yes. Jounce bumpers should always be replaced in pairs (both front or both rear) to ensure even suspension performance and response from side to side. Since they degrade with age, if one has failed, the other is likely not far behind.
Can I reuse my old jounce bumpers when installing new shocks?
It is strongly advised not to. The old foam has likely lost its ability to absorb impacts effectively, even if it looks intact. Given the low cost of new bumpers and the high cost of labor, installing new ones is cheap insurance for your new shocks and struts.
What happens if I don't replace a failed jounce bumper?
Continuing to drive with a crumbled jounce bumper will lead to a harsh, noisy ride and will cause your suspension to bottom out on bumps. This can prematurely wear out or damage your expensive shock absorbers. The crumbled foam pieces can also get into the shock's seal and cause it to fail and leak fluid.
Are there any recalls for the 335i jounce bumper?
No, there are no specific recalls from BMW or the NHTSA for jounce bumper failure on the 2007-2015 335i. The failure is considered a normal wear-and-tear item due to the age and material of the part.
Technical Specifications
OEM Part Numbers: 33536860161 33536791538 31336777636
Material: Microcellular Polyurethane Foam. Location: Front Strut Assembly / Rear Shock Absorber.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- BMW 335i:
- 🛍️ Shop This Part
- Why Your 335i Jounce Bumper Matters
- Check Your Vehicle Generation and Suspension Type
- Symptoms of a Failing Jounce Bumper
- Choosing the Right Aftermarket Jounce Bumper
- Stock Replacement: CRP/Rein
- Performance Upgrade: Dinan
- Pro Tip: Replace Jounce Bumpers with Shocks and Struts
- Cost of Replacing a BMW 335i Jounce Bumper
- Frequently Asked Questions (FAQ)
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