GMC Caballero Front Disc Brake Caliper Guide (1978-1987)
Address common pulling, dragging, and grinding brake problems on your 1978-1987 GMC Caballero.
- The most common failure is a seized caliper piston or slide pins, often caused by age, rust, or inactivity.
- Symptoms include pulling to one side, a dragging sensation, grinding noises, and a burning smell from the wheel.
- Always inspect the flexible rubber brake hose, as an internal collapse can mimic a seized caliper.
- For safety and balanced braking, always replace front calipers as a pair.
Is Your Caballero Pulling to One Side? It Could Be a Bad Caliper
The most common issue with the original calipers on a 1978-1987 GMC Caballero is seizing or sticking. This happens when the caliper piston or the slide pins get stuck due to rust or debris. Rust often forms from old, moisture-filled brake fluid or from the vehicle sitting for long periods. A stuck caliper can cause serious driving problems. It might fail to release, causing the brake to drag, or it might not apply pressure correctly, reducing your stopping power.
Check the Brake Hose First!
A common mistake is blaming the caliper when the real problem is an old rubber brake hose. Over time, the inside of the hose can collapse. This acts like a one-way valve, trapping brake fluid and keeping the caliper squeezed against the rotor, even when you take your foot off the pedal. If your brakes are dragging, inspect the flexible brake hoses before replacing the caliper.
Symptoms of a Failing Brake Caliper
Pay attention to these signs. A bad caliper is a major safety risk and should be fixed immediately.
- Vehicle Pulls to One Side: When you brake, the car pulls sharply to the left or right. It might also pull slightly even when you're just cruising.
- Brake Drag: It feels like the car is sluggish or that the parking brake is slightly on while you drive. This will hurt your fuel economy.
- Grinding or Squealing: You hear a constant grinding or high-pitched squeal from one of the wheels. This can happen if a stuck caliper causes the brake pads to wear down completely.
- Burning Smell or Smoke: A dragging brake creates extreme heat, which can cause a strong, acrid burning smell and even smoke from the wheel area. If you see smoke, pull over immediately as this is a fire hazard.
- Uneven Brake Pad Wear: When you inspect your brakes, the pad on one side of the rotor is much more worn than the other, or one wheel's pads are more worn than the opposite wheel's.
Choosing the Right Aftermarket Caliper for Your Caballero
For a classic vehicle like the Caballero, new OEM parts from GM are generally not a practical option. The market is made up of new and remanufactured aftermarket calipers. Since this article is about NEW parts, we will focus there. New aftermarket calipers are made with 100% new materials and have no core charge.
| Brand Tier | Brands | Best For |
|---|---|---|
| Standard Replacement | BBB Industries, Cardone (New), Raybestos (New) | Daily driving and factory-level performance. Raybestos is a dedicated brake company with a generally positive reputation in forums. Cardone is widely available but has mixed reviews on quality control. |
| Performance / Aesthetic Upgrade | Powerstop | Owners looking for better looks and potentially better performance. Powerstop calipers are often powder-coated (usually red) for corrosion resistance and a custom look. They are typically remanufactured but come with all new hardware and seals. |
Pro Tip: Always replace calipers in pairs (both front wheels at the same time). A new caliper will behave differently than your old one, and replacing only one can cause unbalanced braking and make the car pull to one side. It is also best practice to install new brake pads and rotors with your new calipers.
Frequently Asked Questions
Should I buy a new or remanufactured caliper?
This guide focuses on new aftermarket parts. New calipers are made from all-new materials and have no core charge. Remanufactured calipers are original casings that have been rebuilt with new seals and pistons. Their quality can be hit-or-miss. For a simple, common caliper like the D154, a new aftermarket part from a reputable brand is often a reliable and cost-effective choice.
What are 'loaded' vs 'unloaded' calipers?
An 'unloaded' or 'semi-loaded' caliper is just the caliper body itself, sometimes with new hardware like slide pins and clips. A 'loaded' caliper comes pre-assembled with new brake pads already installed. Loaded calipers can save time during installation.
Do I need special tools to replace a brake caliper?
You will need a standard set of mechanic's tools, including a socket set, wrenches, a C-clamp or piston tool to compress the piston, and a tool for bleeding the brakes. You must also have a jack and jack stands to safely lift the vehicle. A torque wrench is highly recommended for tightening bolts to factory specifications.
Were there any recalls on the GMC Caballero brake calipers?
No. While there were two brake-related recalls for the 1978-1987 GMC Caballero, they concerned the hydraulic hoses and rear wheel cylinders, not the front disc brake calipers themselves.
Technical Specifications
OEM Part Numbers: 18060134 18060135
The front calipers for the 1978-1987 GMC Caballero are a single-piston floating design that uses a D154 style brake pad. They mount to a spindle with a 5.5-inch bolt spacing.
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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.