A Guide to Replacing Disc Brake Calipers on Your 1979-1986 Cadillac Eldorado
Understanding the unique front and rear brake calipers on your classic Eldorado is the first step to a safe, reliable stop.
- The rear calipers on 1979-1985 models are a known failure point due to a faulty self-adjusting parking brake mechanism.
- You MUST use the parking brake regularly to keep the rear calipers properly adjusted.
- When replacing rear calipers, they require a special adjustment procedure that must be done BEFORE bleeding the brakes to get a firm pedal.
- Consider buying NEW aftermarket rear calipers instead of remanufactured ones to avoid getting a reused, faulty piston adjuster.
Is Your Eldorado's Braking Not What It Used to Be?
The brake calipers on your 1979-1986 Cadillac Eldorado are critical for safety. While the front calipers are a fairly standard design, the rear calipers on these models are unique and known for causing problems. Understanding the signs of failure, especially with the rear brakes, can save you from a spongy pedal and poor stopping power.
A Special Warning About 1979-1985 Rear Calipers
The rear disc brake calipers on these Eldorados have a built-in parking brake mechanism that is supposed to self-adjust as the pads wear down. This mechanism often fails or seizes, especially if the parking brake is not used regularly. When it fails, the piston stops adjusting, leading to a low or soft brake pedal, excessive pedal travel, and very poor rear braking. Many owners report that only their front brakes seem to be working, which is a dangerous situation.
Choosing the Right Aftermarket Caliper
Since original GM parts for a vehicle this age are scarce, you will be choosing from aftermarket brands. Your choice is typically between new and remanufactured calipers. For this specific vehicle, this choice is very important.
- New Aftermarket Calipers: These are made from all-new components. Brands like Cardone offer new calipers. This is often the safest bet for the problematic rear calipers, as it ensures the internal adjusting mechanism is fresh and not a reused, potentially faulty part.
- Remanufactured Aftermarket Calipers: These are original caliper cores that have been rebuilt. Brands like ACDelco, Cardone, Raybestos, and BBB Industries offer remanufactured options. While more affordable, they can be a gamble. Some rebuilders may reuse the original piston and adjuster, which is the part that fails most often. If choosing remanufactured, look for premium lines that specifically mention new pistons and seals.
When shopping, look for calipers with a protective coating (often zinc-plated or powder-coated). This helps prevent rust and corrosion, which is a common issue with bare cast iron parts.
Brand Tiers at a Glance
- Premium Aftermarket (Good Choice): ACDelco Gold (Professional) and Raybestos Professional Grade are solid choices from reputable brake companies. They often feature better coatings and quality control.
- Standard Aftermarket (Use with Caution): Brands like Cardone (standard remanufactured line), BBB Industries, and Dynamic Friction offer functional replacements. With remanufactured parts, quality can be inconsistent. For the rear of an Eldorado, be extra cautious and confirm if the piston assembly is new.
How Much Should You Expect to Pay?
Prices can vary based on brand, whether the part is new or remanufactured, and if it includes the mounting bracket.
| Part Type | Estimated Price Range (Per Caliper) |
|---|---|
| New Aftermarket | $75 - $172 |
| Remanufactured Aftermarket | $33 - $90 |
| Shop Labor (Per Axle) | $150 - $300+ |
Note: Labor costs can be higher for the rear calipers due to the complex adjustment procedure. Prices are estimates and may vary.
Installation Pro Tip: The Rear Caliper Adjustment is NOT Optional
Replacing the rear calipers on a 1979-1985 Eldorado is not a standard job. The piston must be turned to retract it, not just pushed with a C-clamp. After installation, the piston must be manually adjusted outward to be extremely close to the brake pads before you bleed the brakes. If this step is skipped, you will never get a firm brake pedal. It is also critical to use the parking brake regularly after installation to keep the calipers adjusted.
Frequently Asked Questions
Do I need to replace my calipers in pairs?
Yes, it is always recommended to replace calipers in pairs (both front or both rear). This ensures even braking performance and prevents the vehicle from pulling to one side.
What's the difference between a loaded and unloaded caliper?
An 'unloaded' or 'semi-loaded' caliper is just the caliper itself, sometimes with new hardware like clips and pins. A 'loaded' caliper comes complete with new brake pads already installed. For the Eldorado's rear, getting an unloaded caliper and choosing your own high-quality pads is often a good approach.
Why is my parking brake so important on this car?
On the 1979-1985 models, the rear calipers adjust themselves based on the use of the parking brake. Every time you set the brake, a mechanism inside the caliper piston turns to take up any slack from pad wear. If you don't use it, the mechanism can seize, and your rear brakes will stop working correctly.
Can I use a C-clamp to push the rear piston back?
No. The rear caliper pistons on these Eldorados must be rotated to retract them into the bore. Using a C-clamp can damage the internal parking brake and adjustment mechanism. You will need a special caliper piston tool that turns the piston as it applies pressure.
Helpful Videos
Technical Specifications
The 1979-1986 Eldorado uses single-piston floating calipers on the front and rear. The rear calipers for 1979-1985 models incorporate a unique, mechanically actuated parking brake with a ratcheting self-adjuster. The front calipers are a standard design for the era.
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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.
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Eldorado's Braking Not What It Used to Be?
- A Special Warning About 1979-1985 Rear Calipers
- Choosing the Right Aftermarket Caliper
- Brand Tiers at a Glance
- How Much Should You Expect to Pay?
- Installation Pro Tip: The Rear Caliper Adjustment is NOT Optional
- Frequently Asked Questions
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