A Mechanic's Guide to the 1979-1987 GMC K2500 Parking Brake Cable
Don't let a snapped or seized cable leave your classic GMC K2500 rolling away when parked.
- Your truck has multiple cables; you must inspect the system to see which one failed.
- Aftermarket cable quality can be inconsistent; inspect the new part and compare it to the original before installing.
- The most common failures are stretching, which causes a loose pedal, or seizing from rust, which can lock the brake on.
- No safety recalls for parking brake cables were found for the 1979-1987 GMC K2500.
Is Your Parking Brake Cable Failing?
A failing parking brake cable isn't just an inconvenience; it's a safety issue. On these classic GMC trucks, the most common cause of failure is the cable stretching, rusting, or snapping. Because the system relies on multiple cables, it's important to inspect the entire length from the pedal to both rear wheels to identify the problem area.
Common Symptoms of a Bad Cable:
- Spongy or Loose Pedal: The pedal feels weak, goes down too easily, or has no resistance at all. This usually means a cable has stretched or snapped.
- Truck Rolls on Hills: You set the parking brake, but the truck still rolls. This is a clear sign the cable is no longer able to hold the brakes tight.
- Brake Won't Release: The cable can rust and seize inside its protective sheath. This can cause the parking brake to get stuck on, making the truck feel sluggish and creating a burning smell from the rear brakes.
- Visible Damage: A quick look under the truck might reveal a cable that is visibly frayed, kinked, or rusted through.
No Recalls for This Model Year
While GM has issued recalls for parking brake systems on newer trucks, searches of the NHTSA database show no recalls or technical service bulletins (TSBs) related to the parking brake cables for the 1979-1987 GMC K2500 model range.
Choosing the Right Aftermarket Parking Brake Cable
Since Original Equipment (OEM) cables for this generation of truck are largely discontinued, you will be shopping for aftermarket parts. The two most common brands available are Dorman and Raybestos.
It's important to be honest about aftermarket quality for these parts. Forum discussions among truck owners show mixed experiences.
- Dorman: Often the most budget-friendly option. However, their quality is frequently described as "hit or miss." Some users report success, while others have had issues with poor fitment or premature failure.
- Raybestos: Traditionally a well-respected name in brake components. While many of their parts are high quality, some owners have reported that their recent parking brake cables can feel less heavy-duty than the original factory parts.
Pro Tip: Regardless of the brand you choose, inspect the new cable before you install it. Compare its length, fittings, and the thickness of the cable to the old part you are replacing. Many owners suggest that even a used OEM cable from a salvage yard can sometimes be a better option than a low-quality new aftermarket part.
Typical Replacement Costs
Your total cost will depend on how many of the system's cables need to be replaced. Prices below are estimates for a single cable.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Cable | $24.29 - $48.03 |
| Shop Labor | $150 - $350 |
| New OEM Cable | N/A (Generally Discontinued) |
Frequently Asked Questions (FAQ)
How many parking brake cables does my 1979-1987 K2500 have?
Your truck has a multi-part system: one front cable connected to the pedal, an intermediate cable, and two separate rear cables (one for each rear wheel). You must identify which cable has failed, though it's often a good idea to replace them in pairs (both rears) or as a full set if they are all original.
Should I replace all the cables at once?
If one cable has failed due to age and rust, the others are likely in similar condition. If you plan on keeping the truck and want maximum reliability, replacing all the cables at the same time is the best approach. If budget is a concern, you can replace only the failed section.
How do I know if I need the front, intermediate, or rear cable?
You'll need to get under the truck and visually inspect the system. Follow the cable from the driver's side frame rail back to where it connects to the rear cables. Look for the section that is broken, seized, or excessively stretched. The rear cables are the most common failure point due to their exposure near the wheels.
How do I adjust the new parking brake cable?
Adjustment is typically done at the point where the front cable connects to the intermediate or rear cables. There is usually a threaded rod with a nut that allows you to take up slack in the system. The goal is to tighten it enough so the pedal feels firm and holds the truck, but not so tight that the brakes drag when the pedal is released.
Technical Specifications
System consists of a front cable, intermediate cable, and two rear cables (left/right) connecting to rear drum brakes.
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.