2018 Mercedes-Benz Metris — Torque Specifications

Quick reference

These values reflect common ranges for the 2018 Metris/W447 platform. Sub-models, brake packages, and market differences can change specs—always confirm against the OEM service information for your exact VIN.

Wheel lug torque pattern

Use a 5-lug star (cross) pattern and bring the wheel bolts up in three stages within the listed range (for example, ~50%, ~80%, then 100% of final torque). After the vehicle has been lowered and the wheel is seated, re-check final torque. If wheels were removed for brake work, re-torque after 25–50 miles to ensure the fasteners have settled evenly.

Basic 5-lug star order: 1 → 3 → 5 → 2 → 4. Keep the socket square on the bolt head to avoid damaging the finish and threads. Do not lubricate wheel bolt threads on Mercedes-Benz applications unless the OEM procedure specifically calls for it; torque values assume clean, dry threads.

Brake torque notes

• Carrier/bracket bolts: The front and rear caliper carrier bolts on the Metris use relatively high torque to resist shear loads. Clean threads, apply the threadlocker type and strength specified by Mercedes-Benz (often medium), and torque within the ranges above. Many carrier bolts are single-use—verify part number notes.
• Slide pins: Over-torquing can bind the caliper; under-torquing can let pins walk out. Apply a thin film of high-temperature silicone brake grease to the pin bodies only; keep grease off the threads unless the OEM specifies a coated fastener. Torque within 18–26 ft-lb (25–35 Nm).
• Rotor set screws (if present): These are low-torque, corrosion-prone screws; snug to 3–7 ft-lb (4–10 Nm) only. They locate the rotor—they do not retain the wheel.
• Always pump the brake pedal before moving the vehicle after any brake service to seat pads and pistons.

Why torque matters

Correct torque keeps clamp load within the engineered window so fasteners don’t loosen, deform, or fail. On a unibody van like the W447:

• Wheels: Too little torque can let a wheel work loose; too much can stretch wheel bolts, warp rotors, or make roadside service impossible.
• Engine/transmission: Drain plugs seal via washers. Under‑torque risks seepage; over‑torque can strip alloy pans or crack plastic components.
• Brakes: Carrier bolts see high temperature and vibration; correct torque with the proper threadlocker helps maintain caliper alignment and braking consistency.
• Ignition/glow system: Spark/glow plugs thread into aluminum heads; precise torque ensures heat transfer and avoids seized or broken plugs.
• Sealing surfaces: Valve cover and intake manifold bolts need low, even torque to prevent oil/vacuum leaks without distorting gaskets or covers.

Additional tips and disclaimers

• Specs can vary by market (gas vs. diesel), brake package, wheel size, and production date. Use the vehicle’s VIN and consult the official Mercedes-Benz Workshop Information System (WIS/ASRA) for definitive values and tightening sequences.
• Replace single-use fasteners (common on hub/axle, some brake carrier bolts, and certain engine components) and all sealing washers/O-rings disturbed during service.
• Use a calibrated torque wrench. For low-torque items like valve cover and intake bolts, switch to an inch‑pound wrench for accuracy.

Critical fasteners should be verified in the OEM service manual before final assembly. When in doubt, look up the exact spec by VIN.

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