***UPDATE 2026***
Amazon now sells a stainless steel parking brake clip for the F30 that is much cheaper than the one I bought. I haven’t tried it myself, but based on the images and reviews, it looks like it would work just as well for a fraction of the price! The installation will be almost exactly the same as what is shown in this blog. Buy the new stainless steel clip here.
BMW Grinding or Rattling Under Acceleration? The "Parking Brake Clip" Fix
If your BMW makes a metallic grinding or rattling noise during acceleration, you likely aren't facing a transmission failure. Instead, you are likely dealing with a common failure of the parking brake cable retainer clip.
The Problem: BMW Part # 34406854898
Between 2012 and 2018, many BMW models were manufactured with a plastic clip (BMW Part # 34406854898) designed to hold the parking brake cables away from the driveshaft.
The Failure: Over time, heat and age cause this plastic clip to become brittle and snap.
The Symptom: Once the clip breaks, the cables sag and make physical contact with the rotating driveshaft.
Progression: Initially, you may only hear the noise under hard acceleration (due to engine torque/tilt). Eventually, gravity pulls the cables down permanently, leading to a constant grinding sound.
Affected BMW Models (2012–2018)
This issue is widespread across the F-Chassis platforms, including:
2 Series: F22, F23
3 Series: F30, F31, F34
4 Series: F32, F33, F36
M-Models: F80 M3, F82 M4
Other variants: Various X-series and Gran Turismo models.
The Solution: AGA Tools Aluminum Upgrade
While you can replace the broken part with another OEM plastic clip, it is prone to failing again. AGA Tools offers an all-aluminum replacement clip designed to be a permanent, "buy it once" fix that won't become brittle.
***UPDATE 2026***
Amazon now sells a cheaper stainless steel parking brake clip for the F30 Buy the new stainless steel clip here.
Repair Cost: Dealership vs. DIY
Dealership Quote: Forum members and owners frequently report quotes between $700 and $1,300. This high cost is primarily due to the labor required to access the clip, which is located in a tight space above the driveshaft.
DIY Potential: If you have jack stands, basic hand tools, and the patience to work in a cramped space, you can perform this repair yourself for the cost of the part and a few hours of labor.
Pro Tip: Addressing this early prevents the driveshaft from damaging your parking brake cables, which would lead to a much more expensive repair.
Tools Required
Tube light (optional/ helpful)
BMW 3 Series & 4 Series PArking brake Cable retainer clip replacement Guide
Step 1: Jack up car from the rear and support it with jack stands. I like to lift from the rear subframe.
Step 2: Unplug the wiring harness from the exhaust valve actuator.
Step 3: Remove six T45 bolts to remove the exhaust support brace.
Step 4: Remove two 13mm nuts from the exhaust hangers to lower the exhaust. Support the exhaust with one hand while removing the second nut and be ready for it to drop down. I lowered mine onto a block of wood to keep it off the ground.
Step 5: Remove about a dozen 10mm nuts to remove the exhaust heat shield. The edges are sharp so I recommend wearing gloves. Be careful not to bend it out of shape while pulling it out.
With the exhaust and heat shield out of the way, you’ll have a clear view of the retainer clip which is attached to the fuel tank, right above the driveshaft.
Step 6: Remove the 13mm nut from the factory clip. A ratcheting 13mm box wrench like this makes this a breeze.
Step 7: Spray silicone onto the rubber grommet, then use pliers to pull the plastic clip off the grommet. You may need to wiggle it back and forth to help the silicone penetrate. Be careful not to damage the grommet, as the new AGA clip re-uses the factory grommet.
Step 8: Install the top portion of the AGA retainer clip into the rubber grommet. The notch on top will fit into a groove in the fuel tank.
Step 9: Install the rubber insulators included in the kit around the parking brake cables, then install the bottom portion of the clip with the retainers facing forward. Secure it in place with the 13mm nut provided in the kit. AGA recommends spraying both the insulators and the inside of the retainers with silicone spray.
I had trouble getting the nut to thread on due to the thickness of the rubber insulators, but with patience and some elbow grease, I was finally able to get it to thread.
Re-assembly: Re-assemble everything in reverse order. Install the heat shield, lift the exhaust back up and secure the hangers. Install the exhaust plate and plug in the valve controller.
BMW Parking brake retainer clip replacement video
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