The Shimano BR-MT420 is a hydraulic brake caliper with Postmount fitting, designed for demanding mountain bike use. Thanks to its 4-piston design and mineral oil actuation, it delivers high braking power and precise modulation.
Four pistons distribute the clamping force evenly for powerful deceleration without fading.
Mineral oil as brake fluid ensures reliable hydraulics even in extreme temperatures.
Postmount design allows easy and rigid direct mounting to the frame or fork.
Compatible with resin brake pads – quiet and low wear in everyday use.
Universally usable front or rear, with a weight of only 229 g.
What sets the BR-MT420 apart
Compared to standard two-piston calipers, the BR-MT420 offers significantly higher braking performance with equally good modulation. The use of mineral oil simplifies maintenance and avoids corrosion in the braking system.
Ideal for...
Mountain bikers looking for reliable and powerful brakes for trail, enduro, or touring. Also suitable for e-bikes and cargo bikes that require more braking power.
How to install the brake caliper
The caliper is attached directly to the Postmount mounts on the frame or fork using screws. After installation, the brake hose must be bled and cut to the correct length. Use Shimano mineral oil and original bleed kits for optimal results.
Shimano is a leading manufacturer of bicycle components based in Japan. For over 100 years, Shimano has developed innovative drivetrain, brake, and shifting components for all categories of bicycles. The brand stands for precision, reliability, and constant improvement of the cycling experience.
The Shimano BR-MT420 is a hydraulic disc brake caliper with four pistons and Postmount fitting. It operates with mineral oil and can be mounted on the front or rear of the bike.
The caliper is suitable for mountain bikes, e-bikes, trekking bikes, and cargo bikes that require higher braking power. It is compatible with standard Postmount frames and forks.
The BR-MT420 has four pistons, Postmount attachment, uses mineral oil, and is hydraulic. It weighs 229 g and uses resin brake pads. It can be mounted front or rear.
The package includes the brake caliper with resin brake pads and mounting screws. The brake hose and mineral oil must be purchased separately.
Installation is done with two Postmount screws directly on the frame or fork. After installation, the brake system must be bled with Shimano mineral oil. Regularly check pad thickness and oil level.
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