Kool-Stop D640S Sintered Disc Brake Pads for Shimano Saint, Zee & TRP 4-Piston Brakes
Heavy-duty sintered disc brake pads designed for aggressive trail, enduro, downhill, eMTB, and high-power braking applications.
The Kool-Stop D640S brake pads are a premium sintered replacement pad designed for riders who demand consistent braking performance in wet weather, steep descents, and heavy-duty riding conditions. Featuring a durable sintered compound and steel backing plate, these pads deliver excellent heat resistance and long service life when compared to many organic compounds.
Compatible with popular Shimano Saint, Zee, and TRP 4-piston brake systems, the D640S is an excellent choice for gravity riders, eMTB riders, bike park laps, and riders who routinely generate high braking loads.
Key Functional Details
- Sintered compound for maximum durability and heat resistance
- Designed for aggressive trail, enduro, downhill, and eMTB riding
- Maintains braking performance during long descents
- Excellent wet-weather braking characteristics
- Steel backing plate for durability and consistent performance
- Includes retaining spring
- Factory replacement fitment for multiple Shimano and TRP systems
- Sold as one complete brake pad set for one caliper
Technical Specifications
- Brand: Kool-Stop
- Model: D640S
- Pad Style ID: 31
- Pad Material: Sintered
- Compound: Standard Sintered
- Backplate Material: Steel
- Includes Spring: Yes
- UPC: 760251076352
- Manufacturer Part Number: KS-D640S
- Made in USA
Compatibility & Technical Notes
- Compatible with Shimano Saint M810, M820, M640, and M8020 brake calipers.
- Compatible with Shimano Zee brake systems using Saint/Zee style pads.
- Compatible with TRP G-Spec E-MTB, Quadiem, Quadiem G-Spec, Slate Evo, and Slate T4 brakes.
- Designed specifically for 4-piston brake systems using Pad Shape 31.
- Not compatible with Shimano XT, SLX, Deore, or road/gravel brake systems using different pad shapes.
- Always verify your current pad shape before ordering.
- New brake pads should be properly bedded-in after installation.
Service / Ownership Context
- Popular replacement for riders wearing out pads quickly on steep terrain
- Sintered compounds typically last longer than organic compounds
- Excellent choice for heavier riders and eBike applications
- Provides consistent braking performance in wet and muddy conditions
- Ideal for riders experiencing brake fade on long descents
- Rotor condition should be inspected whenever brake pads are replaced
Fit & Use Signals
- Good Fit: Shimano Saint, Shimano Zee, TRP Quadiem, TRP Slate, eMTB, downhill, enduro, bike park riding
- Not A Fit: Shimano XT, SLX, Deore, road, gravel, or 2-piston systems using different pad shapes
- Use Case: Enduro racing, downhill riding, eBike use, aggressive trail riding, wet weather riding