2017 Peterbilt 579 – Brake Pad & Rotor Specs

Quick reference

How to choose pads

When it comes to the 2017 Peterbilt 579, almost all applications use an air brake system, meaning there are no "pads" in the traditional sense that you'd find on a passenger vehicle with hydraulic disc brakes. Instead, trucks like the Peterbilt 579 utilize brake shoes and drums, or increasingly, air disc brakes that use brake pads designed for heavy-duty applications.

For air disc brakes, the choice of brake pads is critical for performance, longevity, and safety. Here's a breakdown of common pad types:

• Ceramic: While common in passenger cars, ceramic formulations for heavy-duty air disc brakes are designed for severe service. They offer excellent wear resistance, quiet operation, and good heat dissipation, making them a premium choice for long-haul and regional applications. They often produce less dust.
• Semi-Metallic: These pads are a workhorse in the heavy-duty trucking world. Composed of various metallic fibers (steel, copper, iron) mixed with organic and inorganic fillers, semi-metallic pads excel in high-heat situations and offer strong stopping power. They can be more prone to noise and produce more dust than ceramic options but are generally more affordable and robust for demanding applications.
• Heavy-Duty (HD) Specific Formulations: Many manufacturers offer proprietary heavy-duty formulations tailored for specific applications, such as severe vocational use (construction, refuse) or mountainous terrain. These often feature unique blends designed for extreme heat, heavy loads, and prolonged braking, prioritizing durability and fade resistance above all else.

Always consult with your brake component manufacturer or a reputable heavy-duty parts supplier to ensure you select the correct pad formulation for your 2017 Peterbilt 579's specific braking system and operational needs.

Typical service life

The service life of brake components on a 2017 Peterbilt 579 can vary dramatically depending on several factors, including:

• Application: Long-haul highway trucks tend to see longer brake life compared to regional delivery or vocational trucks that experience more frequent braking.
• Terrain: Operations in mountainous regions or areas with frequent downhill grades will naturally wear brakes faster.
• Driving habits: Aggressive driving, excessive following distances, and improper use of engine brakes can significantly reduce brake life.
• Load: Heavier loads place more stress on the braking system, leading to faster wear.
• Maintenance: Regular inspections and proper adjustment of air brakes (if equipped with drum brakes) are crucial for maximizing life.

For air disc brakes, typically, brake pads on a Peterbilt 579 can last anywhere from 150,000 to 300,000 miles or more in favorable conditions. Brake rotors generally last longer than pads, often requiring replacement only after two or three pad changes, or if they fall below minimum thickness specifications or show signs of cracking or severe warping. It's crucial to inspect brakes at every preventative maintenance (PM) interval.

Common brake issues for this generation

While the Peterbilt 579 is a robust truck, certain brake-related issues can arise, particularly common to heavy-duty air brake systems, or specifically to early adoption of air disc brakes:

• Uneven Pad Wear: This can be a sign of sticking caliper slide pins, a faulty caliper, or issues with the air chamber pushrod adjustment (for drum brakes) or auto-adjusters (for air disc brakes). Uneven wear quickly diminishes braking efficiency and can lead to premature replacement.
• Brake Noise (Squealing/Grinding): Squealing can indicate worn pads, contamination, or improper installation. Grinding almost always means the pads are completely worn and the backing plate is contacting the rotor or drum, requiring immediate attention to prevent further damage.
• Brake Fade: Reduced stopping power after repeated or prolonged braking is often due to overheating. This can be exacerbated by heavy loads, mountainous terrain, or improper pad selection. Air disc brakes are generally more resistant to fade than drum brakes but can still experience it under extreme conditions.
• Rotor Cracking/Warping: Heavy-duty rotors are subjected to immense heat. Cracking, especially surface cracks, can develop over time and necessitate replacement. Warping (runout) can lead to pulsation feedback in the pedal and steering wheel, although this is less common with air disc systems than with hydraulic systems.
• Air System Leaks: For air brakes, leaks in the air lines, chambers, or valves can lead to reduced air pressure, affecting braking performance and potentially setting off low-air warnings.

Regular, thorough brake inspections by qualified technicians are key to identifying and addressing these issues before they become safety hazards or lead to costly repairs.

Brake job cost estimate

Estimating the cost of a brake job on a 2017 Peterbilt 579 can vary widely due to several factors including labor rates, parts costs, and the extent of the repair (e.g., just pads vs. pads, rotors, and calipers). Heavy-duty truck brake jobs are significantly more involved and expensive than passenger car brakes.

Here's a general breakdown for one axle (either front or rear) using air disc brakes:

• Parts:
  • Brake Pads (per axle): Expect to pay $150 - $400+ for a set of premium heavy-duty air disc brake pads. Prices vary by manufacturer and specific formulation.
  • Brake Rotors (per axle): If new rotors are needed, they can range from $300 - $700+ each. Many applications will require two rotors per axle.
  • Caliper (if needed): A remanufactured air disc brake caliper can cost $400 - $800+.
• Labor: Heavy-duty truck labor rates can range from $120 - $180+ per hour. A full air disc brake job (pads and rotors) on one axle can take 3-6 hours or more, depending on component condition and accessibility.

Total Estimated Cost (per axle, and highly variable):

• Pads only: Roughly $400 - $900+ (parts + labor)
• Pads and Rotors: Roughly $1,200 - $2,500+ (parts + labor)
• Pads, Rotors, and Calipers: Could easily exceed $2,500+ per axle.

These are rough estimates, and it's always best to get a detailed quote from a reputable heavy-duty truck service center tailored to your specific Peterbilt 579 and its brake system.

Find a trusted brake shop on Repairius.