2018 Peterbilt 389 Brake Pad & Rotor Specs
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick Reference
| Spec | Measurement/Type |
|---|---|
| Front Pad PN (OEM) | Verify with dealer |
| Front Pad PN (Aftermarket) | Akebono: Verify with Akebono |
| Rear Pad PN (OEM) | Verify with dealer |
| Rear Pad PN (Aftermarket) | Akebono: Verify with Akebono |
| Front Rotor Diameter | Verify with dealer |
| Front Rotor New Thickness | Verify with dealer |
| Front Rotor Minimum Thickness | Verify with dealer |
| Rear Rotor Diameter | Verify with dealer |
| Rear Rotor New Thickness | Verify with dealer |
| Rear Rotor Minimum Thickness | Verify with dealer |
| Caliper Piston Count (Front) | Verify with dealer |
| Caliper Piston Count (Rear) | Verify with dealer |
| Caliper Bracket Torque (Front) | Consult service manual |
| Caliper Bracket Torque (Rear) | Consult service manual |
| Caliper Slide-Pin Torque (Front) | Consult service manual |
| Caliper Slide-Pin Torque (Rear) | Consult service manual |
| Brake Fluid Spec | DOT 3 or DOT 4 (Verify with service manual) |
How to choose pads
When it comes to the heavy-duty world of a Peterbilt 389, brake pad choice isn't just about stopping; it's about reliable, consistent stopping power under demanding conditions. Different pad materials offer distinct advantages and disadvantages, impacting performance, longevity, and cost.
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Semi-Metallic Pads: These are a very common choice for heavy-duty trucks like the 389. They offer excellent stopping power and are generally more resistant to fade under heavy braking and high temperatures due to their metallic composition. They’re durable and can handle the significant thermal loads generated by stopping a heavy rig. However, they can be a bit noisier and produce more brake dust compared to ceramic pads.
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Ceramic Pads: While often associated with passenger vehicles, ceramic pads are becoming more prevalent in certain heavy-duty applications. They excel in quiet operation and low dust production. They also tend to be very long-lasting. For a Peterbilt 389, ceramic pads might be suitable if the truck operates primarily in less extreme conditions or if noise and dust are significant concerns. However, some ceramic formulations may not offer the same high-temperature fade resistance as semi-metallic pads under continuous, heavy braking.
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Heavy-Duty (HD) Specific Pads: Many manufacturers offer pads specifically formulated for heavy-duty truck applications, often blurring the lines between semi-metallic and ceramic with proprietary blends. These pads are designed to withstand extreme heat, provide consistent performance with heavy loads, and offer extended service life. For a Peterbilt 389, seeking out pads explicitly labeled as
More specs for the 2018 Peterbilt 389
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2018 Peterbilt 389 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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