Shimano BR-MT420The Shimano BR-MT420 caliper features consistent braking performance and reliable stopping power in all conditions. The 4-piston caliper instills greater downhill confidence and control. Shimano BL-M4100With quicker brake engagement and shorter free stroke, the Shimano BL-M4100 brake lever delivers intuitive braking so you can stay focused on the trail ahead. Four PistonDisc brake system with the dual diameter opposed-piston caliper design has differently sized pistons in front and in the rear. The system adopts a power transfer system in which the disc brake rotor is pressed by the smaller sized piston at the entrance of the disc brake rotor intake and also by the more powerful larger sized piston at the back. This prevents the wobbling motion of the disc brake rotor and reduces noises significantly.The 4-piston caliper also allows a wider contact area for the disc brake rotor while keeping the size compact, and the efficient location of pads is adjusted as necessary to stabilize the pressure. In combination use with the SERVOWAVE lever it provides an incredible 50% more stopping power than the previous model. The advanced SAINT/ZEE disc brake system, which adjusts to accommodate the different braking styles of different riders, offers stable braking power and excellent modulation. One Way Bleeding“ONE WAY BLEEDING” was developed for quick and easy prevention of air in Shimanos hydraulic systems. Shimano has streamlined the oil route throughout the system to prevent air bubbles from being captured in the system. One way oil routing plus a funnel tool with mineral oil provides an easy and clean bleeding system.
Shimano BR-MT420The Shimano BR-MT420 caliper features consistent braking performance and reliable stopping power in all conditions. The 4-piston caliper instills greater downhill confidence and control. Shimano BL-M4100With quicker brake engagement and shorter free stroke, the Shimano BL-M4100 brake lever delivers intuitive braking so you can stay focused on the trail ahead. Four PistonDisc brake system with the dual diameter opposed-piston caliper design has differently sized pistons in front and in the rear. The system adopts a power transfer system in which the disc brake rotor is pressed by the smaller sized piston at the entrance of the disc brake rotor intake and also by the more powerful larger sized piston at the back. This prevents the wobbling motion of the disc brake rotor and reduces noises significantly.The 4-piston caliper also allows a wider contact area for the disc brake rotor while keeping the size compact, and the efficient location of pads is adjusted as necessary to stabilize the pressure. In combination use with the SERVOWAVE lever it provides an incredible 50% more stopping power than the previous model. The advanced SAINT/ZEE disc brake system, which adjusts to accommodate the different braking styles of different riders, offers stable braking power and excellent modulation. One Way Bleeding“ONE WAY BLEEDING” was developed for quick and easy prevention of air in Shimanos hydraulic systems. Shimano has streamlined the oil route throughout the system to prevent air bubbles from being captured in the system. One way oil routing plus a funnel tool with mineral oil provides an easy and clean bleeding system.
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The lowest price for Shimano Bl-m4100+br-mt420 Rear Brake Black right now is .
Shimano Bl-m4100+br-mt420 Rear Brake Black
Shimano BR-MT420The Shimano BR-MT420 caliper features consistent braking performance and reliable stopping power in all conditions. The 4-piston caliper instills greater downhill confidence and control. Shimano BL-M4100With quicker brake engagement and shorter free stroke, the Shimano BL-M4100 brake lever delivers intuitive braking so you can stay focused on the trail ahead. Four PistonDisc brake system with the dual diameter opposed-piston caliper design has differently sized pistons in front and in the rear. The system adopts a power transfer system in which the disc brake rotor is pressed by the smaller sized piston at the entrance of the disc brake rotor intake and also by the more powerful larger sized piston at the back. This prevents the wobbling motion of the disc brake rotor and reduces noises significantly.The 4-piston caliper also allows a wider contact area for the disc brake rotor while keeping the size compact, and the efficient location of pads is adjusted as necessary to stabilize the pressure. In combination use with the SERVOWAVE lever it provides an incredible 50% more stopping power than the previous model. The advanced SAINT/ZEE disc brake system, which adjusts to accommodate the different braking styles of different riders, offers stable braking power and excellent modulation. One Way Bleeding“ONE WAY BLEEDING” was developed for quick and easy prevention of air in Shimanos hydraulic systems. Shimano has streamlined the oil route throughout the system to prevent air bubbles from being captured in the system. One way oil routing plus a funnel tool with mineral oil provides an easy and clean bleeding system.
Shimano BR-MT420The Shimano BR-MT420 caliper features consistent braking performance and reliable stopping power in all conditions. The 4-piston caliper instills greater downhill confidence and control. Shimano BL-M4100With quicker brake engagement and shorter free stroke, the Shimano BL-M4100 brake lever delivers intuitive braking so you can stay focused on the trail ahead. Four PistonDisc brake system with the dual diameter opposed-piston caliper design has differently sized pistons in front and in the rear. The system adopts a power transfer system in which the disc brake rotor is pressed by the smaller sized piston at the entrance of the disc brake rotor intake and also by the more powerful larger sized piston at the back. This prevents the wobbling motion of the disc brake rotor and reduces noises significantly.The 4-piston caliper also allows a wider contact area for the disc brake rotor while keeping the size compact, and the efficient location of pads is adjusted as necessary to stabilize the pressure. In combination use with the SERVOWAVE lever it provides an incredible 50% more stopping power than the previous model. The advanced SAINT/ZEE disc brake system, which adjusts to accommodate the different braking styles of different riders, offers stable braking power and excellent modulation. One Way Bleeding“ONE WAY BLEEDING” was developed for quick and easy prevention of air in Shimanos hydraulic systems. Shimano has streamlined the oil route throughout the system to prevent air bubbles from being captured in the system. One way oil routing plus a funnel tool with mineral oil provides an easy and clean bleeding system.
The all-time low was $72.09 on 13 Sept 2025 — today's price is 96% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 10 May 2026.
Last updated at 10/05/2026 18:30:41
Shimano Unisex - Adult Deore Disc Brake, Black, 1700 mm
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originally posted on balfesbikes.co.uk
Bit pricey, but good feedback and decent stopping power.
originally posted on tredz.co.uk
No bells or whistles but if you pull the leave it will stop you. Not too hard to fit.
originally posted on ebay.com
Nice action and set up.
| Position | Rear |
Shimano Unisex - Adult Deore Disc Brake, Black, 1700 mm
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Bit pricey, but good feedback and decent stopping power.
No bells or whistles but if you pull the leave it will stop you. Not too hard to fit.
Nice action and set up.
Easy to install, work perfect and were a nice upgrade. Would recommend.
My son loves his new 1x10 setup
My son loves his new 1x10 setup
Nothing wrong with the Shimano upgrade for front brake, however trying to get technical information from customer services was pointless, lack of product knowledge.
| Position | Rear |
