A Guide to Replacing Rear Brake Drums on Your 2005-2010 Chevrolet Cobalt
Everything a Cobalt owner needs to know about choosing and replacing rear brake drums.
- Brake drums should always be replaced in pairs to ensure safe, balanced braking.
- A pulsating pedal or thumping noise from the rear are key signs of a worn or warped brake drum.
- It is highly recommended to replace the brake shoes and spring hardware at the same time as the drums.
- No recalls have been issued for the brake drums themselves, but other Cobalt recalls can affect braking systems like ABS.
Symptoms of a Failing Brake Drum
When your Cobalt's brake drums are wearing out, they will give you warning signs. Ignoring them can lead to bigger problems and unsafe driving conditions. Look out for these common symptoms:
- Pulsating Brake Pedal: If you feel a pulsing or vibration through the brake pedal when you apply the brakes, it's a strong sign the drum is warped or "out-of-round." This means the surface is no longer perfectly circular, causing uneven contact with the brake shoes.
- Scraping or Grinding Noises: A loud scraping or grinding sound from the rear of the car when braking usually means the brake shoes are completely worn out and metal is grinding against the drum. This can quickly destroy the drum.
- Thumping or Knocking Sounds: A consistent thumping noise that changes with wheel speed can indicate an out-of-round drum, even on new parts if they are defective.
- Spongy or Soft Brake Pedal: While this can have many causes, a leaking wheel cylinder inside the drum or a severely worn drum can contribute to a pedal that feels soft or goes too close to the floor.
- Parking Brake Issues: If the parking brake handle pulls up much higher than it used to, or the car doesn't hold securely, it can be a sign that the rear brakes, including the drums and shoes, are worn out and need adjustment or replacement.
A Note on Self-Adjusters
The rear drum brakes on the Cobalt are designed to self-adjust. However, this mechanism doesn't always work perfectly. Some mechanics suggest that regularly using your parking brake can help the adjusters work as intended, keeping the brakes in proper alignment. If the brakes feel weak, the adjusters may need to be manually reset during a service.
Choosing the Right Aftermarket Brake Drum
You don't need to buy the most expensive brake drum for your Cobalt to get good, safe performance. Aftermarket parts offer a great balance of quality and price. They are generally grouped into a few tiers.
Brand Quality Tiers
- OEM-Equivalent & Premium Aftermarket (Best Quality): Brands like ACDelco (GM's own parts division), Brembo, and Raybestos are known for high-quality materials and manufacturing. They often feature coatings to prevent rust on the non-braking surfaces, which keeps them looking better for longer. These are a great choice for daily driving and will provide reliable, quiet performance.
- Quality Aftermarket (Good Balance): Brands such as Centric, Bendix, and Dynamic Friction offer solid performance and are a popular choice for everyday use. They meet or exceed OEM specifications and provide a dependable, budget-friendly alternative to premium brands.
- Economy & Performance Kits (Use with Caution): Brands like Powerstop often come in kits with pads or shoes. While convenient, some users report issues with drilled and slotted rotors (not applicable to drums) warping in daily driving conditions. Economy brands like Pronto will work, but may not have the same corrosion resistance or long-term durability as higher-tier options.
Pro Tip: Replace in Pairs
Always replace brake drums in pairs (both rear wheels at the same time). This ensures even braking performance and prevents the car from pulling to one side. It's also highly recommended to replace the brake shoes and the spring hardware at the same time you replace the drums. This gives you a completely fresh braking system in the rear.
Estimated Costs for Brake Drum Replacement
The cost can vary based on which parts you choose and whether you do the work yourself. Most of the cost for a professional job is labor.
| Part / Service | Estimated Cost |
|---|---|
| New Aftermarket Brake Drum (Single) | $49 - $92 |
| New Aftermarket Brake Shoes & Hardware Kit | $30 - $60 |
| Shop Labor | $150 - $250 |
| Total Professional Replacement (Drums, Shoes, Hardware) | $280 - $500 |
Frequently Asked Questions (FAQ)
Were there any recalls on the 2005-2010 Cobalt brake drums?
No. While the 2005-2010 Chevrolet Cobalt was subject to major recalls for its ignition switch and power steering systems, there were no specific recalls issued by the NHTSA for the rear brake drums themselves.
Can I replace just one brake drum?
You should not. Brake drums must be replaced in pairs (both rear wheels) to ensure balanced braking. Replacing only one can cause the car to pull to one side during braking, which is dangerous.
Do I need to "turn" or machine my new brake drums?
No. New aftermarket brake drums are ready to be installed out of the box. Machining is a service for used drums that have enough material left to smooth out their surface. However, some owners have reported that even new, inexpensive drums can be slightly out-of-round, causing a thumping noise. If this happens, you may need to have them checked by a machine shop or exchange them.
Why are my new drums making a thumping noise?
A thumping noise from new drums often points to an "out-of-round" condition, meaning the drum isn't perfectly circular. This can be a manufacturing defect. It's also important to ensure the drum is seated flat against the hub and that the wheel is torqued down correctly.
Is replacing Cobalt brake drums a good DIY job?
Yes, for those with some mechanical experience. The process is straightforward, but the old drums can be severely rusted to the wheel hub, making removal difficult. It often requires a heavy hammer and sometimes heat to break them free. If you are not comfortable with this, it's best to leave it to a professional.
Helpful Videos
Technical Specifications
OEM Part Numbers: 19138411 25960262 171-1085
Fitment varies based on 4-lug or 5-lug wheel configurations. Always verify your Cobalt's specific wheel lug count before ordering.
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.
- Chevrolet Cobalt: