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Shimano Deore Disc Brake Calliper - BR-MT420 - 4-piston

Shimano Deore Disc Brake Calliper - BR-MT420 - 4-piston

The Shimano BR-MT420 Deore 4-piston Disc Brake Calliper offers exceptional value and robust brakin...

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Shimano BR-MT410 2-Piston Hydraulic Disc Brake Caliper w/ Brake Pads Set B01S

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6 offers from £30.64 - £53.99

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eBayShimano BR-MT410 2-Piston Hydraulic Disc Brake Caliper w/ Brake Pads Set B01S
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Team CyclesShimano Unisex Black Br-Mt420 Deore 4-Piston Disc Brake Calliper
£4.99 delivery
£47.99
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Tweeks CyclesShimano BR-MT420 4-Piston Disc Brake Caliper
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£47.99
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Product Information

Full details

The Shimano Deore BR-MT420 4-piston disc brake calliper is designed for cyclists seeking powerful and reliable hydraulic braking performance without breaking the bank. Its key benefit is enhanced control and stopping power on demanding trails and descents, making it ideal for mountain biking. A potential caveat is its reliance on Shimano hydraulic levers for optimal function. This calliper features a robust 4-piston design, mineral oil compatibility, and a simple, shim-less mounting system.

All features

SeriesDeore
Model Part NumberBR-MT420
BrandSHIMANO

Extended Product Information

FAQs

What type of brake fluid does this calliper use?

This calliper is designed exclusively for Shimano's non-corrosive mineral oil. Do not use DOT fluid.

Does this calliper come with brake lines?

No, the Shimano BR-MT420 calliper is sold as a standalone unit and does not include brake hoses or fittings. These must be purchased separately.

Can I use this calliper with SRAM levers?

While it might be mechanically possible, it is strongly recommended to use this calliper with compatible Shimano hydraulic levers for optimal performance, safety, and reliability.

What is the difference between this and a 2-piston calliper?

The 4-piston design provides significantly more braking force and better modulation (finer control over braking) compared to a 2-piston calliper, making it ideal for heavier riders or more demanding terrain.

What is one-way bleeding?

One-way bleeding is a system that allows fluid and air to escape through the bleed port in only one direction, simplifying the process of removing air bubbles from the brake lines.

Do I need adapters to mount this calliper?

This calliper features a Post Mount fitting. If your fork or frame has an International Standard (IS) mount, you will need the appropriate adapter. Check your bike's specifications.

Troubleshooting

Brake lever feels spongy or soft

The brake system likely needs to be bled. Use Shimano mineral oil and follow the one-way bleeding procedure.

Brakes are noisy (squealing)

Ensure the rotor is clean and free of oil. Check pad alignment and consider trying metallic pads if resin pads are used in very wet conditions. Bed in the new pads and rotor properly.

Calliper not aligning with rotor

Loosen the mounting bolts slightly, squeeze the brake lever firmly, and re-tighten the bolts while holding the lever. If necessary, use frame/fork specific adapters for correct alignment.

Reduced braking power

Check brake pad wear; replace if worn down. Ensure the rotor is clean and the system is properly bled. Verify compatibility with the brake lever.

Pros and Cons

Pros

  • Provides significant stopping power and control due to the 4-piston design.
  • Mineral oil system is safe, stable, and requires less frequent maintenance.
  • Easy installation with the shim-less bracket.
  • One-way bleeding simplifies maintenance and ensures performance.
  • Excellent value for a 4-piston hydraulic disc brake calliper.

Cons

  • Requires a compatible Shimano hydraulic brake lever for optimal performance.
  • Resin pads may offer less power in very wet or muddy conditions compared to metallic pads (though metallic pads can be fitted).
  • Post mount fitting may require an adapter for certain fork or frame standards.
  • Does not include brake hose or fittings, which need to be purchased separately.

Setup, Compatibility & Care

Setup:

  1. Mount the calliper to the frame or fork using the appropriate post mount hardware (or adapters if needed). Ensure the calliper is aligned with the rotor.
  2. Connect the hydraulic brake hose (sold separately) to the calliper using Shimano-compatible fittings.
  3. Connect the other end of the hose to a compatible Shimano hydraulic lever.
  4. Bleed the brake system using Shimano mineral oil and the one-way bleeding procedure.

Compatibility:

  • Rotors: Compatible with Shimano SM-RT series rotors (both 6-bolt and Centre Lock versions).
  • Pads: Compatible with Shimano D03S resin pads (included) or metalic pads of the same series.
  • Levers: Designed to work with Shimano hydraulic brake levers (e.g., Deore, SLX, XT series).
  • Mounting: Primarily designed for Post Mount, but adaptable to IS (International Standard) mounts with appropriate adapters.

Care:

  • Regularly check brake pad wear and replace when necessary.
  • Keep the braking surfaces of the rotor clean.
  • Periodically bleed the brake system, especially if lever feel becomes spongy.
  • Clean the calliper exterior with a damp cloth; avoid high-pressure water or solvents directly on seals.

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