A Guide to Replacing Disc Brake Calipers on Your 1991-1996 Buick Roadmaster
Everything you need to know before buying new aftermarket brake calipers for your Roadmaster.
- Confirm your model year before buying; 1994-1996 models use larger front brakes than 1991-1993 models.
- Always replace calipers in pairs (both fronts or both rears) to ensure safe, balanced braking.
- Sticking slide pins and collapsing rubber brake hoses are very common issues that can feel like a bad caliper.
- A recall was issued for the 1992 model's ABS modulator, which can leak fluid and reduce braking power.
Signs of a Failing Brake Caliper
A bad brake caliper can cause serious safety issues. Unlike brake pads that wear out over time, calipers usually fail when they get stuck. Look for these common symptoms:
🎬 Watch this video to learn how to diagnose a stuck caliper.- Vehicle Pulls to One Side: When you brake, a stuck caliper can cause the car to pull towards the side of the good caliper. If it pulls when you are just driving, the caliper may be stuck clamped down.
- Uneven Brake Pad Wear: If you check your brake pads and one is much more worn than the other, it's a classic sign of a sticking caliper or seized slide pins.
- Brake Fluid Leaks: Puddles of oily fluid near your wheel could be brake fluid leaking from a bad caliper seal.
- Hot Smell or Smoke: A dragging caliper creates constant friction, which generates a lot of heat. You might notice a burning smell or even see smoke from the wheel after a drive.
- Spongy or Soft Brake Pedal: While this can have many causes, it can be a symptom of a caliper issue, especially if it happens with other symptoms.
Known Issues for 1991-1996 Roadmaster Brakes
Sticking Slide Pins: The most common issue on these GM B-body cars is not always the caliper piston itself, but the slide pins it moves on. These pins can rust or lose grease, causing the caliper to bind. Always clean and lubricate the slide pins 🎬 See a full walkthrough of a Roadmaster front brake job here. during a brake job.
Internal Brake Hose Collapse: The flexible rubber brake hoses can break down on the inside and act like a one-way valve. This traps brake fluid, keeping the caliper engaged even after you release the pedal. This problem feels exactly like a seized caliper. It is highly recommended to replace the front brake hoses 🎬 Watch this guide on how to properly replace your brake hoses. when you replace the calipers.
ABS Modulator Recall: There was a recall for the 1992 Roadmaster (NHTSA #97V217000) because the Antilock Brake System (ABS) modulator could corrode and leak fluid. This can increase stopping distances. While not a caliper issue, it's a critical safety check for the brake system on these vehicles.
Choosing the Right Aftermarket Caliper
For the 1991-1996 Roadmaster, several aftermarket brands offer quality replacement calipers. They generally fall into a few categories.
Important: Check Your Year!
GM upgraded the brakes for the 1994 model year to go with the new LT1 engine. 1994-1996 Roadmasters have larger front brakes than 1991-1993 models. You must order the correct caliper for your specific year.
Brand Tiers
- OEM-Equivalent (Best Quality): ACDelco is GM's own parts brand and is considered the original equipment manufacturer. Their "Gold" or "Professional" line parts are designed to fit and perform like the originals and are a top choice for a factory-quality repair.
- Performance Upgrade: Powerstop offers calipers that are often powder-coated for better corrosion resistance and a performance look. These are a great choice if you tow with your Roadmaster or simply want an upgrade in durability and appearance.
- Standard Aftermarket: Brands like Centric and Cardone (New) offer quality new calipers that meet or exceed OEM specifications. They provide a great balance of price and quality for a daily driver.
- Economy / Remanufactured: Cardone (Remanufactured), BBB Industries, and Dynamic Friction are often the most budget-friendly options. Remanufactured calipers are original castings that have been cleaned, inspected, and rebuilt with new seals and hardware. They are a reliable and cost-effective choice, but may require a "core charge" until you return your old part.
| Part Type | Estimated Price Range | Notes |
|---|---|---|
| New Aftermarket | $33 - $98 | Includes a range of standard, coated, and performance options. |
| Remanufactured Aftermarket | $30 - $70 | Often requires a core charge. A very common and reliable repair option. |
| New OEM (ACDelco) | $80 - $150+ | Highest cost, but guaranteed original fit and quality. |
Pro Tip: Replace in Pairs
It is always recommended to replace brake calipers in pairs (both front calipers or both rear calipers at the same time). This ensures even braking performance and prevents the car from pulling to one side. Replacing just one can lead to unbalanced braking and premature wear on the new part.
Frequently Asked Questions (FAQ)
Do I have to replace my calipers in pairs?
Yes, it is highly recommended. Replacing both the left and right calipers at the same time ensures that both sides have equal clamping force and response. This provides safe, balanced braking and prevents your car from pulling to one side under braking.
What is a 'core charge' on remanufactured calipers?
A core charge is a deposit you pay when buying a remanufactured part. The "core" is your old, worn-out caliper. You get the deposit back when you return your old caliper to the seller. This allows the manufacturer to rebuild your old part and keep costs down.
Should I replace my brake hoses at the same time?
Yes, for a vehicle of this age, it is an excellent idea. The original rubber brake hoses can degrade internally, causing them to swell shut or act as a check valve that traps pressure. This mimics the symptoms of a failed caliper. Replacing the hoses is a low-cost way to ensure your new calipers work correctly.
Is replacing a brake caliper a DIY job?
For a person with some mechanical experience, yes. The job involves safely lifting the vehicle, removing the wheel, unbolting the old caliper and brake line, and installing the new one. The most critical step is properly bleeding the brakes afterward to remove all air from the system. If you are not comfortable bleeding brakes, it is best to have a professional mechanic do the job.
Helpful Videos
Technical Specifications
OEM Part Numbers: 18015427 18015428
The 1991-1996 Buick Roadmaster uses a single-piston, floating caliper design for the front brakes. The key difference is the size increase for the 1994-1996 models to accommodate larger rotors.
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.
- Buick Roadmaster: