Lexus RX Brake Discs: Specs, Fitment & Wear Symptoms
A genuinely alarming, honest account: continuous brake vibration lasted two years despite multiple rotor, pad, and caliper replacements — plus a genuine finding that front hub runout, not the disc itself, can be the actual persistent cause.
Illustration for editorial purposes
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OEM Part Number: 43512-48110 (genuine front disc — confirm via VIN) — aftermarket front discs Brembo 09.E126.11 / Bosch 0 986 479 H04
| Front brake discs (aftermarket) | Brembo 09.E126.11 (328 x 28 mm, vented, 5 holes, coated, minimum thickness 25 mm); Brembo 09.D988.11 (328 x 34 mm, vented, 5 holes, coated, minimum thickness 31 mm); Bosch 0 986 479 H04 (328 x 34 mm, vented, 5 holes, coated, high-carbon, ECE R90, minimum thickness 32 mm); Textar 92259405 (328 x 28 mm, vented, 5 holes, coated, high-carbon, minimum thickness 25 mm); Delphi BG9358C (328 x 34 mm, vented, 5 holes, coated, R90); Zimmermann 590.2834.20 (328 x 28 mm, vented, 5 holes, coated, high-carbon, ECE R90); Zimmermann 590.2839.20 (328 x 34 mm, vented, 5 holes, coated, high-carbon, minimum thickness 31 mm, 11 kg) |
|---|---|
| Disc sizes & variants | Two front variants of the same 328 mm diameter but different thickness: 328 x 28 mm and the heavier 328 x 34 mm. The 34 mm disc is the later/heavier-duty fitment used on the 450h and the long-wheelbase RX L; the 28 mm disc is shared with the NX and used on the 200t/300 and earlier 450h. A 338 x 18 mm Brembo (09.E031.11) also listed is a rear disc. |
| Genuine (OE) numbers quoted | 43512-48110 (genuine front disc number for this model — confirm via VIN, as several disc sizes exist) |
| Fitment notes | Both front discs are 328 mm, so thickness must be checked before ordering (28 mm versus 34 mm, minimum 25 mm versus 31-32 mm). |
Lexus RX Brake Discs: The Part That Pads Depend On
On the Lexus RX, discs and pads don't wear independently — neglect one and the other degrades faster too, which is exactly why what starts as a routine pad change frequently turns into a disc replacement as well.
Lexus RX Brake Discs: Watch: Replacing It
Covers the RX450h hybrid too.
Lexus RX Brake Discs: What They Do
Brake discs provide the surface the brake pads clamp against to slow the car, converting momentum into heat through friction. Larger, sportier trims of the RX typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.
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A Genuinely Alarming, Honest Real Account Worth Knowing — Lexus RX Brake Discs
If a vibration under braking has survived multiple rotor replacements, this is genuinely worth knowing: one documented case saw a 2010 RX350 suffer continuous brake vibration for two full years, with the owner replacing rotors and pads multiple times, and even the front calipers, without the vibration ever resolving. It's genuinely worth knowing that repeatedly replacing the same components isn't guaranteed to work if the actual root cause lies elsewhere.
It's also genuinely worth knowing an honest, real account worth bearing in mind: one documented case saw brand new discs fitted, only for the exact same vibration to appear immediately, straight out of the box — worth knowing that if a fresh replacement disc shows the identical fault from the very start, the disc itself likely isn't the actual root cause. It's also worth cleaning the mating faces between the hub, disc, and wheel thoroughly before assuming a disc is warped, since accumulated dirt or corrosion at these contact points can itself cause a genuine vibration.
Lexus RX Brake Discs: Wear Symptoms, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Brake Discs Guide for warning signs to watch for, confirming fitment against your VIN, and choosing a reliable aftermarket disc.
More Lexus Brake Discs
The same part, covered across other Lexus models.