When a Mercedes G63 arrived at our workshop with the check engine light on, noticeably reduced power during acceleration, vibration at highway speed, weak AC cooling, and a strange noise from the front wheels under braking, it was clear this vehicle needed more than one repair. This case study explains how our team detected and fixed each problem and why Mercedes G63 Brake Pad Replacement and AC Service are the two most important factors in the repair plan besides a few other urgent mechanical repairs.
The customer had just acquired this Mercedes G63 from another country and had been on its way to Dubai for about 2 months on shipment at sea. That detail turned out to be highly relevant, since extended time in a humid, salt-air marine environment often accelerates corrosion on components like spark plugs, and can leave a car’s fluids, filters, and rubber components in worse condition than the mileage alone would suggest.
Diagnosing the Mercedes G63 Brake Pad Replacement and AC Service Requirements
Before recommending any repair, our technicians performed a full diagnostic inspection covering the engine, suspension, braking system, and climate control system. Four separate customer complaints needed to be investigated individually, since a check engine light, vibration, weak AC, and brake noise can each stem from entirely unrelated causes, even though they surfaced around the same time in this case. Two findings, worn front brake pads and a leaking AC system, directly shaped the Mercedes G63 Brake Pad Replacement and AC Service that became central to this repair.
Mercedes G63 Brake Pad Replacement Diagnosis: Worn Front Pads and Noise
The customer heard the noise from the front wheels at low speed while braking is one of the most recognizable warning signs in any vehicle, and our inspection confirmed the cause immediately: the front brake pads had only about 10% of their material life remaining. At this wear level, brake pads are close to metal-on-metal contact, which is both the source of the noise and a genuine safety concern if left unaddressed, making a full Mercedes G63 Brake Pad Replacement the clear recommendation rather than a temporary adjustment.
Why Brake Pad Replacement Was Urgent
Continuing to drive with brake pads this worn risks damaging the brake discs themselves, which would turn a routine brake pad replacement into a more expensive disc replacement job. We recommended immediate replacement of the front brake pads with original components to match the Mercedes G63’s factory braking performance and safety standards.
Disc Skimming for a Smooth, Noise-Free Finish
Alongside the brake pad replacement, we recommended disc skimming to resurface the brake discs and remove any minor grooving or uneven wear that had developed. This step ensures the new brake pads make full, even contact with the disc surface, helping eliminate noise and restore smooth, consistent braking performance.
Mercedes G63 AC Service Diagnosis: Leaking High and Low Pressure Valves
The customer complained that the AC was not cooling as well as it should, so our specialists checked the refrigerant pressure in the system directly and found leaks at both the high pressure and low pressure valves. It was explained that if a leak occurs at either valve then refrigerant escapes slowly thus the AC cooling reduces gradually rather than all at once and it was confirmed that a true AC Service, not a gas top-up, was needed.
Valve Replacement and System Flushing
Because both valves were leaking, we recommended replacing both the high-pressure and low-pressure valves rather than attempting a partial repair. A full AC system flush was also recommended to clear any contaminants and residual moisture before recharging, as skipping this step often leads to repeat failures shortly after a repair.
AC Gas Refill and Final Verification
After replacing both valves and flushing the system, we did a full AC gas refill and checked cooling performance on a test drive. This is the AC Service which restores the climate control of the Mercedes G63 to the original factory-level cooling performance, very crucial in Dubai’s environment.
Additional Findings: Engine and Suspension Issues on This Mercedes G63
Beyond the Mercedes G63 Brake Pad Replacement and AC Service, our inspection uncovered two additional problems related to the customer’s complaints of a check engine light, reduced power, and vibration at highway speeds. Both needed to be resolved for a complete, verified repair.
Engine Performance Issues Behind the Check Engine Light
The customer’s complaint of a check engine light, combined with noticeably reduced power during acceleration, led our technicians to focus on the ignition and intake system first, since these symptoms are classic signs of poor air-fuel delivery or a weak spark.
Rusty Spark Plugs and Reduced Power
Upon inspection, the spark plugs were found to be severely rusted, almost certainly a consequence of the vehicle’s two months at sea and age-related wear. Rusted spark plugs misfire more easily, which directly explains both the Check Engine light and the customer’s complaint of reduced acceleration power. Replacing them with original spark plugs was an immediate priority.
Dirty Throttle Body and Intake Manifold
In addition to the spark plugs, the throttle body was quite dusty and the intake manifold also needed to be cleaned. The rusty spark plugs already are costing you some power, but a dirty throttle body also hinders the precise airflow the engine needs to accelerate smoothly. We recommended a comprehensive major service, chemical manifold clean and specialised throttle body clean to thoroughly repair the engine performance issue.
Suspension and Wheel Damage Causing High-Speed Vibration
The customer also reported vibration in the car, specifically at speeds above 80 km/h, a symptom that almost always points to a wheel-balance, rim, or suspension component issue rather than an engine problem.
Bent and Damaged Rims
Inspection revealed that the rims were damaged and slightly bent, a direct cause of vibration that intensifies as speed increases. We recommended diamond cutting to restore the rims to a properly balanced, true shape rather than replacing them outright, which is typically the more cost-effective solution when the rim damage is not severe.
Cracked Lower Arms, Control Arms, and Link Rod Bushes
Our technicians also discovered that the lower arms, control arm and link rod bushes were fractured beyond the rims. These suspension components are what keep the wheels correctly aligned and stable . Cracked bushes allow for unnecessary movement and that translates into vibration , especially at highway speeds . We suggested replacing all of them with original parts to get full suspension stability and make sure the vibration issue was entirely remedied and not just partially covered.
Mercedes G63 Brake Pad Replacement and AC Service: The Complete Repair
With every issue diagnosed, from worn brake pads and leaking AC valves to rusted spark plugs and cracked suspension bushes, our technicians proceeded with a full, verified repair covering all four systems rather than addressing symptoms individually.
The Complete Major Service Performed
Beyond the four core issues, our team also completed a full major service on this Mercedes G63 to bring every system up to proper standards, which is particularly important given the vehicle’s recent long-distance shipping. This major service included new spark plugs, an air filter, an AC filter, an oil filter, fresh engine oil, and a new engine belt, a full top-up of all essential fluids, a power steering fluid top-up, an AC gas top-up, a full AC system check, and a wiper fluid top-up.
Our technicians also performed a full brake check and brake cleaning, a full car inspection and a car computer report to confirm the check engine light and all related fault codes were properly cleared. All lighting components tested and the car’s inside and exterior cleaned thoroughly. They also conducted a tire rotation, tire pressure correction, tire inspection, and wheel balancing during the same visit, and ended with a test drive to make sure everything was working correctly. The customer was given free automobile pick-up and drop-off as part of the service, so they didn’t need to plan any other transport.
Test Drive and Final Verification
Our staff did all of the Mercedes G63 Brake Pad Replacement and AC Service as well as the engine and suspension maintenance. Once the work was done, we took the vehicle for an extensive test drive before returning it to the customer. This last check is included in our usual practice for how we end each Mercedes G63 Brake Pad Replacement and AC Service job; a repair is not complete until we have evaluated every original symptom and confirmed it has been corrected on the road. The test drive revealed that the check engine light was no longer on, the vibration at highway speeds over 80 km/h was gone thanks to the rim repair and new suspension components, the noise from the front wheels during braking was gone thanks to the brake pad replacement and disc skimming, and the AC system was cooling to full factory-level performance after the valve replacement, system flushing and gas refill.
Only once every original complaint had been verified as resolved did we proceed with a full car wash and deliver the vehicle back to the customer’s location, in line with our standard commitment to complete, verified repairs rather than a quick turnaround.
Why This Matters for Imported Vehicles in Dubai
This case is a strong example of why imported vehicles, particularly those that have spent extended time on a cargo ship, often need a more thorough inspection than a typical used car purchased locally. Salt air, humidity, and prolonged storage can accelerate corrosion on spark plugs and other ignition components, while extended periods without regular driving can allow suspension bushes and AC seals to dry out or crack. For any similar imported vehicle, a full diagnostic of Mercedes G63 Brake Pad Replacement and AC Service and inspection covering the engine, suspension, AC system, and brakes is the safest way to catch these issues early, well before they turn into larger, more expensive repairs.
Conclusion: Trust Car Garage Expert for Mercedes G63 Brake Pad Replacement and AC Service
This case study reflects exactly the kind of multi-system diagnosis and repair that a Mercedes G63, particularly a recently imported one, may require after extended shipping and unclear service history. From rusted spark plugs and a dirty throttle body to bent rims, cracked suspension bushes, leaking AC valves, and worn front brake pads, every issue was identified through a full inspection and resolved with original parts and proper procedure, not shortcuts.
If your Mercedes G63 or any luxury vehicle is showing similar symptoms- a check engine light, reduced power, vibration at speed, weak AC cooling, or noise while braking- our team at Car Garage Expert is ready to run the same complete diagnostic process and deliver verified, tested repairs. We also offer roadside assistance in Dubai if your vehicle isn’t safe to drive, as well as mobile car mechanic support for less urgent checks at your location. Explore our full car service packages and browse our garage near me in Dubai details. If your vehicle has also suffered cosmetic or import-related bodywork damage, our car-painting team can help restore it to a like-new finish.
Book your Mercedes G63 Brake Pad Replacement and AC Service today: message us on WhatsApp or find us on Google Maps for expert diagnosis and genuine parts in Al Quoz, Dubai.
