Parts for your 2015 Toyota Mark x-Wheel hubs

2015 Toyota Mark X wheel hubs — what they do and how to look after them

Wheel hubs are absolutely used on the 2015 Toyota Mark X (GRX130/133). Toyota’s service literature (TIS) includes specific procedures for “Front Axle Hub” and “Rear Axle Hub and Bearing” for this model and year, and the Toyota Electronic Parts Catalog lists “Front Axle Hub Sub-Assembly (43550-xxxxx)” and “Rear Axle Hub & Bearing (42450-xxxxx)” for GRX130/133 variants. These sources confirm the Mark X employs bolt-on hub assemblies with integrated bearings and ABS tone functionality.

On a 2015 Mark X, the wheel hub assembly does the heavy lifting of keeping each wheel centred and spinning smoothly with minimal friction. It houses the bearing, carries the wheel studs, and provides the mounting face for the brake rotor. The ABS system reads wheel speed from the hub area, so a crook hub can trigger warning lights as well as noise and vibration. Both RWD and AWD Mark X variants use sealed unitised hubs, there’s no routine greasing—when a bearing is worn, the whole hub assembly is replaced.

As part of regular servicing, it’s smart to check for roughness, free play and noise. A gentle spin and a rock at 12-and-6 o’clock with the wheel off the ground will usually give the game away. Techs also listen for a humming or droning that changes with road speed or when loading the car left/right, that’s classic hub bearing behaviour. There’s no fixed kilometre interval—inspection at each service or tyre rotation is the go.

When replacement is due, quality matters. The front hubs on the RWD Mark X are bolt-on units at the steering knuckle, the rears are mounted to the rear carrier and integrate with the parking brake hardware. AWD models use similar unitised hubs at all four corners. Replacing hubs is mostly straightforward but benefits from correct torque on the hub-to-knuckle fasteners, careful handling of the ABS sensor and wiring, and a clean, rust-free mating face so the rotor and wheel sit true. After fitting, a quick road test for ABS operation and a re-check of wheel alignment and brake feel is good practice.

• Typical symptoms: humming/droning with speed, play at the wheel, uneven tyre wear, ABS or traction light.
• Service tip: inspect at each service, replace the complete hub assembly if noisy or loose.
• Parts check: hubs differ front to rear and by RWD/AWD—confirm by VIN before ordering.

Popular questions about 2015 Toyota Mark X wheel hubs

Do the hubs need regular greasing?
No. The Mark X uses sealed, unitised hub bearings. They’re lubricated for life at the factory and aren’t serviceable. The sensible approach is periodic inspection for noise and play, then replace the hub assembly if it shows wear.

How can someone tell which hub is making the noise?
Road test on a smooth surface, gently weaving to load left then right. A right-hand load that gets noisier often points to the left hub (and vice versa). On the hoist, spin each wheel by hand and feel for roughness. If in doubt, a mechanic can use a chassis ear or NVH tool to pinpoint the culprit.

Are Mark X hubs interchangeable with Lexus IS/GS of the same era?
They share platform DNA, but part numbers and specs can vary with drivetrain, brake package and ABS configuration. Don’t assume interchangeability—verify by VIN and the Toyota EPC before buying.