Description

StopTech Drilled Sport Rotors are 1-piece direct replacement brake discs for factory brake systems and stock calipers that look great behind your wheels – and offer significantly improved braking performance. The unique cross-drilling aids with heat and brake dust dispersal; prevents glazing of the pads; adds bite and improves wet and dry braking performance. Built to last; the black e-coating provides protection from corrosion and the high carbon metallurgy (in most applications) offers quieter operation; better crack resistance and increased performance.

Product Overview

For drivers who need something even tougher than a standard StopTech Sport rotor, but are not ready for a big brake kit, StopTech offers cryogenically treated Cryo rotors. Cryogenic treatment is a one-time stress relief process that involves both cold and heat cycling of the brake rotor. Using a proprietary computer-controlled process over a 24-hour period, the cryo machine gradually cools the rotors down to -300 º F, then gradually brings them up to over +300º F, and finally back to room temperature. This conditioning of the rotor improves its service life, especially in fleet and emergency vehicle applications. Any new StopTech or Centric Premium 1-piece replacement rotor can by cryogenically treated prior to shipment. Cryo treatment typically adds 5-7 business days for processing.

Features and Benefits

• Premium e-coated rotor with advanced metallurgy that greatly reduces pad squeal. Especially effective with higher friction; European style brake pad compounds. Drilled for increased bite; improved looks and better performance
• Drilled/Slotted Helps Evacuate Gasses/Dust/Heat
• Directional Curve Vane Designs On Selected Apps
• Power Alloy Is Descendant Of Patented AeroRotor
• Black E-Coated Non-Friction - Corrosion Protection
• Increased Initial bite and Wet Weather Response
• Superior Resistance To Cracks From Thermal Stress
• Double Disk Ground For Consistent Friction Surface
• Direct OE Replacement

Product Details

ABS Tone Ring Included:	No
Attribute ID (Type):	California Proposition 65
Attribute ID Type:	California Proposition 65
Bearings Included:	No
California Proposition 65 Site (basic):	https://www.p65warnings.ca.gov/
California Proposition 65 Site [basic]:	https://www.p65warnings.ca.gov/
California Proposition 65 Text (basic):	WARNING: Cancer and Reproductive Harm
California Proposition 65 Text [basic]:	WARNING: Cancer and Reproductive Harm
California Proposition 65:	WARNING: Cancer and Reproductive Harm
Center Hole Diameter:	2.524
Description:	StopTech Sport Cross Drilled Brake Rotor; Rear Right
Disc Mounting (cntrc):	Floating
Disc Mounting [cntrc]:	Floating
Discard Thickness:	8.000
Hat Finish:	Coated
Misc Holes (cntrc):	2
Misc Holes [cntrc]:	2
Mounting Bolt Hole Circle Diameter:	114.300
Nominal Thickness:	9.000
Outside Diameter:	10.236
Overall Height:	1.661
Part Number:	sto128.40040R
Position:	Rear Right
Rotor Type:	Drilled
Solid Or Vented Type Rotor:	Solid
Stud/Lug Hole Diameter:	0.496
Stud/Lug Hole Quantity:	5
Surface Type:	X Drilled
Title:	StopTech Sport Cross Drilled Brake Rotor; Rear Right
WARNING CA Proposition 65 Message:	WARNING: Cancer and Reproductive Harm
WARNING CA Proposition 65:	Yes
Weight (cntrc) kgs:	3.640
Weight (cntrc) lbs:	8.000
Weight [cntrc] kgs:	3.640
Weight [cntrc] lbs:	8.000

Kit Options

This item is available as a full kit.
Select a kit option in the following table if you are looking for this item in a bundle form with all associated components.

Kit option/s:

Thumb	SKU	Kit Title
	sto936.40050	(1x sto105.05370, 1x sto128.40057L, 1x sto128.40057R, 1x sto128.40040L, 1x sto128.40040R, 1x sto105.15780)
	sto979.40008	Sport Axle Pack Drilled Rotor, 4 Wheel (1x sto309.08290, 1x sto309.05370, 1x sto950.40511, 1x sto128.40057L, 1x sto128.40057R, 1x sto128.40040L, 1x sto128.40040R, 1x sto950.40011)
	sto979.40016	Sport Axle Pack Drilled Rotor, 4 Wheel (1x sto309.05370, 1x sto950.40507, 1x sto950.40010, 1x sto128.40040L, 1x sto128.40040R, 1x sto309.05030, 1x sto128.40026L, 1x sto128.40026R)
	sto979.40008R	Sport Axle Pack Drilled Rotor, Rear (1x sto309.05370, 1x sto950.40511, 1x sto128.40040L, 1x sto128.40040R)
	sto979.40016R	Sport Axle Pack Drilled Rotor, Rear (1x sto309.05370, 1x sto950.40507, 1x sto128.40040L, 1x sto128.40040R)
	sto979.40030R	Sport Axle Pack Drilled Rotor, Rear (1x sto309.05370, 1x sto128.40040L, 1x sto128.40040R, 1x sto950.40519)
	sto979.40030	Sport Axle Pack Drilled Rotor, 4 Wheel (1x sto309.05370, 1x sto309.09142, 1x sto128.40057L, 1x sto128.40057R, 1x sto128.40040L, 1x sto128.40040R, 1x sto950.40011, 1x sto950.40519)

Data: v4.2 - Upd: 2026-10-23 16:13:26

Features

Specifications

Product Attributes - UPC

805890432623

Product Attributes - Brand

StopTech

Product Attributes - Quantity

Sold individually.

Product Attributes - Part Type

Brake Rotors

Product Attributes - Rotor Style

Cross-drilled surface

Product Attributes - Product Line

StopTech Drilled Brake Rotors

Product Attributes - Rotor Finish

Black E-Coat

Product Attributes - Rotor Material

Iron

Product Attributes - Rotor Construction

Vented

Product Attributes - Intended for Street Use

Yes

Product Attributes - Manufacturer's Part Number

128.40040R

Product Attributes - For Use with Stock Calipers

Yes

Product Attributes - Rotor Outside Diameter (in.)

10.22 in.

Compatibility