A Guide to Replacing Disc Brake Pads on Your 2012-2018 BMW 640i
Tired of constant brake dust and noise? This guide will help you choose the right aftermarket brake pads for your 640i.
- The biggest complaint about OEM BMW pads is excessive brake dust; aftermarket ceramic pads from brands like Akebono are a popular low-dust upgrade.
- You must replace the brake pad wear sensor(s) when you replace the pads to extinguish the dashboard warning light.
- Verify if your 640i has standard or M Sport brakes (blue calipers) before ordering, as they require different pads.
- For daily driving, high-quality aftermarket pads from brands like Akebono, Brembo, Centric, or Bosch offer performance equal to or better than OEM, often for less cost and with less dust.
Signs Your Brake Pads Need Replacing
Your BMW 640i is equipped with a sophisticated system to let you know when it's time for new brake pads. Don't ignore these signs, as worn pads can damage more expensive components like rotors and calipers.
- Brake Warning Light: The most obvious sign. Your iDrive system will display a red or yellow warning, often with a "car on a lift" icon, indicating that the brake pads have worn to their minimum thickness. This is triggered by a brake pad wear sensor.
- Squealing or Grinding Noises: A high-pitched squeal when you apply the brakes is an early warning. A louder, more aggressive grinding sound means the pads are completely worn away, and you are hearing metal-on-metal contact, which is severely damaging your brake rotors.
- Vibration or Pulsing: If you feel a pulsing in the brake pedal or a vibration through the steering wheel when braking, it could mean your brake rotors have been warped, often from the heat generated by worn-out pads.
- Reduced Stopping Power: If your car takes longer to stop than it used to, your brake pads may be worn out or suffering from brake fade.
A Note on Brake Pad Wear Sensors
Your 2012-2018 640i uses electronic brake pad wear sensors, typically on the front-left and rear-right wheels. These are small plastic sensors that wear down with the pad. Once they trigger the warning light in your iDrive, they must be replaced along with the brake pads; they cannot be reset or reused. Always purchase new sensors when you buy new pads.
Choosing the Right Aftermarket Brake Pads
One of the most common complaints from 640i owners is the excessive amount of black brake dust produced by the Original Equipment (OE) pads. While OE pads offer good performance, many owners switch to aftermarket ceramic pads for a cleaner and quieter experience without sacrificing much stopping power for daily driving.
Brand Quality Tiers
Here’s a breakdown of popular aftermarket brands to help you choose:
- Premium / Performance (Brembo, Hawk Performance, EBC Brakes): These brands are for the owner who prioritizes stopping power above all else. Brembo is a renowned name in high-performance braking. Hawk and EBC offer various compounds, from street performance to track-focused pads. Be aware that some high-performance pads may create more noise and dust than low-dust ceramic options.
- OEM-Quality & Low-Dust (Akebono, Pagid, Textar): This is the sweet spot for most 640i owners. Akebono is highly regarded for its EURO ceramic pads that offer great stopping power with very little dust and noise. Pagid and Textar are often the original suppliers to BMW, so their pads provide an experience very similar to stock but can sometimes be found at a lower price.
- Daily Driver / Value (Centric, Bosch, Powerstop): These brands offer excellent value and reliable performance for daily driving. Centric's Posi-Quiet and C-TEK lines are popular choices that meet or exceed OE standards. Bosch also provides dependable, quiet brake pads. Powerstop kits, like the Z23 Evolution, are known for being a low-dust and quiet upgrade over stock pads.
M Sport Brakes vs. Standard Brakes
It's important to know if your 640i has the standard brakes or the optional M Sport brakes (often identifiable by blue calipers). These systems use different size pads. M Sport brakes are a step up from standard, featuring fixed multi-piston calipers made by Brembo for better performance and fade resistance. Always verify which brake system your car has before ordering parts to ensure a correct fit.
| Part Type | Estimated Cost Range |
|---|---|
| New Aftermarket Pad Set (per axle) | $40 - $260 |
| New OEM Pad Set (per axle) | $150 - $350 |
| Brake Pad Wear Sensor (each) | $15 - $45 |
| Shop Labor (per axle) | $150 - $300 |
Frequently Asked Questions (FAQ)
Do I need to replace my rotors at the same time as my pads?
It is best practice to replace rotors with pads, especially on high-performance vehicles like a BMW. New, flat rotor surfaces ensure the new pads bed-in correctly and provide maximum performance. If your rotors are below the minimum thickness (stamped on the rotor hub) or show signs of heavy scoring or warping, they must be replaced.
What's the difference between ceramic and semi-metallic pads for my 640i?
Ceramic pads, like those from Akebono, are known for being very quiet and producing minimal, light-colored dust, making them a favorite for daily drivers who want to keep their wheels clean. Semi-metallic pads, which are closer to the original BMW pads, typically offer a stronger initial "bite" and can handle higher temperatures, but they create much more black dust. For most street driving, a quality ceramic pad is an excellent upgrade.
Can I replace just the brake pads myself?
Yes, replacing the brake pads on a 2012-2018 640i is a manageable DIY job for someone with mechanical experience. You will need a good set of tools, including a jack, jack stands, a 9mm hex bit for the caliper guide pins, and a tool to compress the caliper piston. Remember that models with an electronic parking brake require a special procedure or tool to retract the rear caliper motor.
How do I reset the brake service light after changing the pads?
After replacing the pads and the wear sensor, you can reset the service indicator through the instrument cluster. With the ignition on (but engine off), press and hold the trip reset button on the cluster until the service menu appears. You can then cycle through the menu to the brake service icon and press and hold again to initiate the reset.
Technical Specifications
OEM Part Numbers: 34216857805
Vehicle is equipped with electronic brake pad wear sensors on the front-left and rear-right wheels. Standard brakes and optional M Sport brakes use different pad shapes and sizes. The rear axle may feature an electronic parking brake that requires a specific service procedure.
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 640i: