Toyota C-HR Brake Discs: Specs, Fitment & Wear Symptoms

On the C-HR, a genuinely useful myth worth correcting: discs don't actually "warp" — plus a counterintuitive hybrid fact worth knowing.

Illustration for editorial purposes

Find Toyota C-HR Brake Discs Here!

Opens live listings in a new tab.

OEM Part Number: 4243178010

Genuinely worth knowing: 2020-21 Japan-built cars (identifiable by a "J" as the first VIN digit) use different, larger dimensions than standard-build cars — worth checking your VIN's build location before ordering rather than assuming a universal size.

Rear disc, genuine Toyota reference	Toyota OEM: 4243178010 (also referenced as 42431-78010)
Standard build, front discs	298mm diameter, vented, 28mm thickness, 25mm minimum
Standard build, rear discs	281mm diameter, solid, 12mm thickness, 10.5mm minimum
Japan-built (VIN starting with J), 2020-21	305mm front, 292mm rear — genuinely larger than the standard-build specification

A Genuinely Useful Myth Worth Correcting: Discs Don't Actually "Warp" — Toyota C-HR Brake Discs

If you're feeling a pulsing sensation through the brake pedal and have been told the discs have "warped," this is genuinely worth understanding: discs don't actually physically warp or bend. What's really happening is that pad material transfers unevenly onto the disc surface, creating slightly higher and lower points around the circumference — this is what you feel as pulsing. A common cause worth knowing: holding the brake pedal down while stationary immediately after hard braking, rather than releasing it once stopped, keeps heat concentrated in one spot and encourages exactly this kind of uneven deposit.

A genuinely counterintuitive fact worth knowing if your car is a hybrid: regenerative braking typically means the rear brakes see considerably less use than you'd expect, since the electric motor handles much of the everyday deceleration. This can mean rear discs corrode more than the fronts — the opposite pattern to what most owners expect based on conventional cars.

It's also worth knowing that a car left standing overnight with heavily corroded discs can occasionally feel genuinely stuck when trying to pull away — a firm, deliberate application of the accelerator followed by a couple of firm brake applications once moving typically clears this within a few hundred metres.

Toyota C-HR Brake Discs: The Part That Pads Depend On

On the Toyota C-HR, it's a paired system: let either one wear too far and the other suffers for it, which is why so many "just a pad change" jobs end up including discs once a mechanic actually looks.

Before you buy: disc size and design vary by trim, engine size and whether your car has the standard or "sport" brake package. Always confirm against your VIN before ordering.

Toyota C-HR 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 C-HR typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.

Find Toyota C-HR Brake Discs Here!

Opens live listings in a new tab.

Toyota C-HR 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 Toyota Brake Discs

The same part, covered across other Toyota models.