Replacing the Drum Brake Hardware on a 1975-1978 GMC G35
Keep your classic G35's rear brakes working properly by replacing the small parts that make a big difference.
- Always replace the drum brake hardware kit when you replace your brake shoes.
- Verify your G35's brake drum size (11-inch or 13-inch) before ordering parts, as it can vary.
- Weak or broken hardware is a common cause of brake drag, noise, and overheating.
- For this vehicle, quality aftermarket brands like Carlson, Centric, and Dorman are reliable choices.
Is it Time for New Drum Brake Hardware?
The metal springs and clips in your G35's drum brakes get tired over time. Heat, moisture, and constant tension cause them to weaken, rust, and sometimes break. When this happens, you can run into several problems. It is a strong recommendation to replace the hardware any time you replace the brake shoes to ensure trouble-free operation.
Symptoms of Bad Drum Brake Hardware
- Scraping or Clicking Noises: Loose or broken hardware can rattle around inside the brake drum, making noise as the wheel turns.
- Brake Drag: Weak return springs can't pull the brake shoes fully away from the drum. This causes the brakes to drag, which creates excess heat, poor fuel economy, and premature wear.
- Poor Parking Brake Performance: A worn-out hardware kit can affect the proper function of the parking brake, causing your van to roll even when the brake is set.
- Spongy or Inconsistent Pedal Feel: If the shoes are not held securely, it can lead to an unpredictable brake pedal.
Choosing the Right Aftermarket Kit for Your G35
For a vehicle from the 1970s, new Original Equipment (OEM) parts from GM are no longer available. Aftermarket parts are your only realistic option, and modern kits are made to meet or exceed the original factory specifications. The key is choosing a reputable brand.
It is critical to know your vehicle's specific configuration. The 1975-1978 GMC G35 was available with different brake sizes, often depending on whether it had single or dual rear wheels (SRW or DRW). The most common rear drum sizes are 11-inch and 13-inch. Always verify your specific setup before ordering.
Aftermarket Brand Quality
For a straightforward part like a hardware kit, most well-known aftermarket brands offer good quality. The differences often come down to the completeness of the kit and the rust-resistant coating on the parts.
- Carlson: A well-known specialist in brake hardware, Carlson kits are generally considered good quality, complete, and a good value.
- Centric: Centric is a popular and respected name in the brake industry, offering reliable parts that fit correctly.
- Dorman: Known for having a wide catalog of parts, Dorman provides hardware kits that are a dependable option for repairs.
- Dynamic Friction: This brand offers a range of brake components, and their hardware kits are considered a solid, budget-friendly choice.
Pro Tip: Replace Everything at Once
When you're replacing the brake shoes, it is essential to also replace the hardware and inspect the wheel cylinders for leaks. Reusing old, heat-stressed springs is a common mistake that leads to noise and poor performance. A complete kit is inexpensive and ensures your new shoes work correctly from day one.
Typical Cost for a New Drum Brake Hardware Kit
Replacing the drum brake hardware is one of the most affordable parts of a brake job. The cost for the kit itself is low, and the labor is usually included with a brake shoe replacement.
| Part or Service | Estimated Cost |
|---|---|
| New Aftermarket Hardware Kit | $11 - $22 |
| Shop Labor (as part of a rear brake job) | $150 - $300 |
Note: Costs are estimates and can vary based on your location and the specific shop. Labor costs reflect a full rear brake shoe replacement.
Frequently Asked Questions
Can I reuse my old drum brake hardware?
No. The springs lose their tension from heat and age, and reusing them is a common cause of brake noise and dragging. Given the low cost of a new kit, it should always be replaced with the brake shoes.
What is included in a drum brake hardware kit?
A typical kit includes all the necessary return springs, retainer springs, pins, and clips for both the left and right rear wheels. Some kits may also include new self-adjuster components.
How do I know if I have 11-inch or 13-inch drums?
The only way to be certain is to measure the inside diameter of your brake drum. G35 models, especially heavy-duty versions with dual rear wheels, often used larger 13-inch brakes. Check your vehicle's specifications or measure before ordering parts.
Were there any recalls for 1975-1978 G35 brakes?
Searches for this specific period did not find any recalls or Technical Service Bulletins (TSBs) related to the drum brake hardware on the NHTSA database. Any safety recalls would have been issued decades ago.
Technical Specifications
Kits vary based on rear drum diameter (e.g., 11-inch or 13-inch) and Single Rear Wheel (SRW) vs. Dual Rear Wheel (DRW) configurations.
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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.