Freightliner FL60 Disc Brake Caliper Guide (1991-2005)
Keep your medium-duty truck stopping safely by understanding common caliper problems and choosing the right replacement.
- A seized caliper is a common failure; symptoms include pulling, dragging brakes, and uneven pad wear.
- Always replace calipers in pairs (both front or both rear) to maintain balanced braking.
- Verify your caliper's piston size (e.g., 2.60" or 2.88") before ordering a replacement part to ensure correct fitment.
- When replacing calipers, it is best practice to also replace the flexible brake hoses and flush the brake fluid.
Is Your FL60 Brake Caliper Failing?
Brake calipers on the Freightliner FL60 work hard and are exposed to harsh conditions. Over time, they can fail in a few common ways. The pistons or the slide pins that allow the caliper to move can seize up from rust and debris. When this happens, your truck can experience a range of braking problems.
Key Symptoms of a Bad Caliper:
- Truck Pulls to One Side: When braking, a stuck caliper on one side can cause the truck to pull towards the opposite side. If the caliper is seized and constantly applied, it may pull towards the affected side.
- Dragging Brakes: A caliper that doesn't release properly will cause the brake pads to drag on the rotor. You might notice a burning smell after driving or feel like the truck is losing power.
- Uneven Brake Pad Wear: If you inspect your brake pads and find that one pad is much more worn than the other, it's a classic sign of seized caliper slide pins.
- Brake Fluid Leaks: The seals around the caliper pistons can wear out and leak brake fluid. A leak is a serious safety issue that reduces stopping power.
- Spongy or Soft Brake Pedal: While this can have many causes, a leaking caliper or air in the system from a bad caliper can lead to a soft pedal feel.
Check Your Brake Hoses
Sometimes, a locked-up caliper is caused by a bad flexible brake hose, not the caliper itself. The inside of a hose can collapse and act like a one-way valve, trapping hydraulic pressure and keeping the brake applied. If you're replacing a caliper that was stuck, it's a wise and relatively inexpensive precaution to replace the corresponding brake hose as well.
🎬 See how a mechanic troubleshoots locked up brakes on a FreightlinerChoosing the Right Aftermarket Caliper
For a 1991-2005 FL60, aftermarket calipers are the most common and cost-effective choice. You will find both "New" and "Remanufactured" options. Remanufactured (or "reman") calipers are original cores that have been rebuilt with new seals, boots, and other wear components. New calipers are manufactured entirely from new materials.
| Brand Tier | Brands | Good For... |
|---|---|---|
| Better Quality Aftermarket | Raybestos, Centric | Owners looking for a reliable replacement with a good reputation. Both brands are well-regarded in forums for their quality and consistency. Raybestos offers both new and remanufactured options, with their new calipers being a good choice to avoid any risks associated with rebuilt parts. Centric is noted for doing a good job cleaning and preparing cores for their remanufactured units. |
| Standard Aftermarket | Cardone, Dynamic Friction, BBB Industries | Budget-conscious repairs. Cardone is a major remanufacturer, but online discussions suggest their quality can be hit-or-miss; you might get a great part or one that fails prematurely. Dynamic Friction and BBB Industries are widely available but have less specific feedback for this application. |
Confirm Your Piston Size!
Freightliner FL60 models used calipers with different piston diameters, most commonly 2.60" or 2.88". Before ordering, it is critical to confirm the piston size on your existing calipers to ensure you get the correct replacement part. This may require removing the wheel and measuring.
Known Issues, Recalls, and Service Bulletins
While there are no specific recalls or Technical Service Bulletins (TSBs) for brake calipers on the 1991-2005 Freightliner FL60, Freightliner has issued multiple recalls on newer model trucks for improperly torqued caliper mounting bolts. This can cause reduced braking effectiveness. This history highlights the absolute importance of tightening all mounting bolts to the manufacturer's specified torque values during any caliper replacement job.
🎬 Watch a full walkthrough on replacing medium duty truck brakesFrequently Asked Questions (FAQ)
Should I buy a new or remanufactured caliper?
For this truck, a new caliper from a quality brand like Raybestos is often the best choice as it eliminates concerns about the history of the core part. However, a quality remanufactured caliper from a trusted brand like Centric or Raybestos can be a reliable and cost-effective option. The quality of the remanufacturing process is key.
Should I replace calipers in pairs?
Yes, it is highly recommended. Calipers should always be replaced in pairs (both front or both rear) to ensure even braking performance and prevent pulling. If one caliper has failed due to age, the other is likely not far behind.
What else should I replace with my calipers?
You must replace the brake pads and the copper crush washers for the banjo bolt. It is also best practice to replace the flexible brake hoses and flush the entire brake system with new, clean fluid. Inspect the brake rotors for damage, heat cracks, or wear beyond the minimum thickness and replace if necessary.
What are 'loaded' vs. 'unloaded' calipers?
'Unloaded' or 'semi-loaded' calipers are just the caliper body itself, sometimes with new hardware like slide pins and clips. 'Loaded' calipers come pre-assembled with new brake pads already installed. For a professional, unloaded is common, but a loaded caliper can save time for a DIYer.
Helpful Videos
Technical Specifications
Commonly equipped with 2-piston hydraulic calipers. Piston diameters vary, with 2.88 inches being a common size. Most aftermarket replacements are sold as unloaded calipers with phenolic pistons.
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.
- Freightliner FL60: