2014 Peterbilt 579 Brake Pad & Rotor Specs

As an ASE-certified master technician, I've seen it all when it comes to brake jobs. Getting the right parts and specs is the difference between a smooth stop and a costly comeback. This guide covers the essential brake specifications for the 2014 Peterbilt 579.

Quick Reference: 2014 Peterbilt 579 Brake Specifications

Note: The 579 was available with various axle and brake configurations from manufacturers like Bendix and Meritor, including both air disc and traditional S-cam drum brakes. Always confirm your specific setup before ordering parts.

How to Choose Pads

Unlike passenger cars that use hydraulic fluid, the Peterbilt 579 uses a pneumatic (air) brake system. The "pads" are large brake blocks or shoes. Choosing the right friction material is critical for safety and performance.

• Standard/OEM-Equivalent: For most general hauling, OEM-equivalent friction from brands like Bendix or Meritor provides the best balance of stopping power, low noise, and service life. They are engineered to meet the original factory performance standards.
• Severe-Duty/Heavy-Haul: If you frequently operate at maximum gross vehicle weight (GVW), navigate steep grades, or work in vocational applications (like logging or refuse), a severe-duty lining is your best bet. These offer superior fade resistance at high temperatures but may produce more dust and noise.

Given the pneumatic system, a simple "pad-slap" (replacing pads without servicing the rotor/drum) is not a recommended practice for air brakes. A full brake job, including servicing the S-cam (for drums) or caliper slides (for discs), is essential for proper operation.

Typical Service Life

The service life of air brakes on a Class 8 truck like the 579 varies dramatically based on driving habits and application.

• Line Haul/Highway: Trucks that spend most of their time on the interstate with minimal braking can see 250,000 to 500,000+ miles from a set of brakes.
• Regional/Vocational: Trucks in stop-and-go traffic, mountainous terrain, or heavy-haul applications will experience a much shorter life, typically in the 100,000 to 200,000-mile range.

Regularly checking brake stroke and adjustment (for drum brakes) is key to maximizing life and ensuring safe operation.

Common Brake Issues for This Generation

• Sticking S-Cam Bushings (Drum Brakes): Lack of lubrication can cause the S-cams to bind, leading to dragging brakes, excessive heat, and uneven wear. Regular chassis lubrication is critical.
• Seized Caliper Slides (Disc Brakes): Similar to their hydraulic counterparts, air disc caliper guide pins can seize if not properly cleaned and lubricated during a brake service, causing the pads to drag.
• Air Leaks: Leaks from chambers, lines, or valves can reduce braking efficiency and cause the air compressor to cycle excessively. Listen for audible leaks during your pre-trip inspection.
• Glazed or Heat-Cracked Rotors/Drums: Overheating is the enemy of any brake system. Descending long grades without proper use of the engine brake (jake brake) can quickly overheat the service brakes, leading to a dangerous loss of stopping power (fade) and permanent damage to drums and rotors.

Brake Job Cost Estimate

Servicing the air brakes on a Peterbilt 579 is a significantly larger investment than a passenger car brake job. Prices vary by region and whether you are servicing drum or disc brakes.

• Parts: A full axle set of shoes/pads and drums/rotors can range from $800 to $2,000+ per axle, depending on the brand and specific configuration.
• Labor: A professional shop will typically charge 4-6 hours of labor per axle. At a shop rate of $150-$225/hour, expect labor costs of $600 to $1,350 per axle.
• Total Estimate: A complete, single-axle brake job (e.g., one front or one rear axle) will likely cost between $1,400 and $3,350. A full three-axle brake job can easily exceed $5,000 - $8,000.

Find a trusted brake shop on Repairius.