Shimano XT BR-M8120 / BR-M8100 Disc Brake Set w/ Resin Pads J-Kit - black/set (front+rear)

Shimano XT BR-M8120 / BR-M8100 Disc Brake Set w/ Resin Pads J-Kit

Item number: 71994

Shimano XT BR-M8120 / BR-M8100 resin disc brake set - bites even harder up front

With the Shimano XT BR-M8120 / BR-M8100 disc brake set you get a bundle of a four-piston brake for front and a two-piston brake for rear - each with organic brake pads. This gives you an extra portion of brake power on the front wheel, which Shimano has specially tuned for Enduro and Trail use. On the other hand, the 2-piston system at the rear saves some weight. Both calipers feature excellent brake control and a simple connection system. The I-Spec EV compatible BL-M8100 brake levers are mounted at an angle to provide an additional contact point. This increases stiffness and provides more direct feedback. Shimano Servo Wave also enhances braking performance: you can get more performance out of a shorter empty travel.


Deore XT M8100
Enduro, All Mountain, Cross Country
hydraulic, 4 pistons (front), hydraulic, 2 pistons (rear)
mineral oil
Hose Length (Front/Rear):
1000 mm/1700 mm

Technical Information - Caliper:

Caliper Mount:
post mount
resin with cooling fins (front), resin (rear)
Calliper Material:
Piston Material:
Hose Connection:

Technical Information - Lever:

Lever Length:
Adjustment Options:
reach adjust (no tools required), contact point
clamp (split), I-Spec EV
right (side-specific), left (side-specific)
Brake Lever Material:
Brake Lever Housing Material:
Hose Connection:


Mounting Position:
  • front brake caliper: brake lever left
  • rear brake caliper: brake lever right
Brake Rotor:
140 mm, 160 mm, 180 mm, 203 mm, 220 mm (recommended: RT-MT800)
organic and sintered; with narrow pad shape; standard and Ice Tech brake pads


Brake Calliper:
  • excellent brake control helps you to focus on the trail
  • front 4 pistons for extremely powerful braking, rear lightweight 2-piston system
  • easy and quick installation
  • painted
  • steel bolts (5 mm)

Brake Lever:
  • optimised lever axis position with additional contact point and revised ergonomics
  • flexible, action-optimised cockpit layout thanks to I-Spec EV
  • rotation adjustment angle for compatible shift lever: 20°
  • 10% stiffer than M8000 even in heat
  • faster braking with less empty pull
  • funnel venting with M5 funnel
  • anodised lever, painted body
  • stainless steel clamp bolts


Servo Wave
Shimano Servo Wave technology optimises the travel of your brake levers. During the braking process, the brake pads are guided quickly to the brake rotor with very short lever travel. The greater part of the lever travel is reserved for the actual braking force. In this way, you can apply your braking power in a more targeted manner and use it more effectively.

I-Spec EV
I-Spec EV describes a variant of the connection between brake lever and shift lever on Shimano MTB derailleurs. This type of mounting allows the shifter to be adjusted both horizontally and vertically in relation to the brake lever, and ensures a tidy cockpit by reducing the number of clamps required. Compared to I-Spec and I-Spec II, I-Spec EV offers a much wider adjustment range. 14 mm adjustment range the longitudinal direction and up to 60° rotation allow an optimal ergonomic adjustment to your riding style, your sitting position and your anatomy.

One-Way Bleeding
One Way Bleeding is a technique used on Shimano calipers that facilitates brake bleeding. The hose routing has been optimised so that no air bubbles remain in the brake calliper. In combination with the funnel, the brake can be bled cleanly and easily.

J-Kit is a simple line connection system for hydraulic brakes from Shimano, so that you can install your brakes quickly and easily. The brake hose does not come connected to the brake to facilitate routing of the hose in the frame. The brake hose is already filled with oil in the J-Kit and sealed with a thin membrane. There is a small pin in the J-Kit brake lever that pierces this diaphragm during assembly to allow oil to flow.

Manufacturer Number:

I-M8120JLFXSA100 + I-M8100JRRXRA170


  • 1 x Shimano XT BR-M8120 + BL-M8100 disc brake, front
  • 1 x Shimano XT BR-M8100 + BL-M8100 disc brake, rear
  • 1 x Shimano SM-BH90-SBM brake hose, 1000 mm (front)
  • 1 x Shimano SM-BH90-SBM brake hose, 1700 mm (rear)
  • 1 x pair Shimano brake pads, front
  • 1 x pair Shimano brake pads, rear
  • 2 x inserts
  • 4 x calliper bolts
  • 2 x olives (assembled)
  • ready for installation, filled, bleeding is recommended after installation

Order Together:

  • 100 day return period
  • Online since 1998
  • Trusted Shop 4.84 / 5.00


  • black/set (front+rear), sold out

Customer Reviews (4)


Customer Reviews (4)


Give us your opinion on this product.

by Ralf F. on 17.04.2024
verified purchase
item: black/set (front+rear)

Super verarbeitet ,ist eben Shimano ,1A

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by Alexander B. on 08.06.2023
verified purchase
item: black/set (front+rear)
0 of 1 customers found this review helpful.

DAS ist ne Bremse! Ich habe seit Anfang April ein Radon Skeen Trail - leider mit Magura MT5 und MT4. Also wie hier mit 4 Kolben vorn, 2 hinten.
Ich konnte mit den - unverständlicherweise - hochgelobten Maguras keine zufriedenstellende Bremsperformance erreichen. Es war mit dem Rad kein Stoppie möglich - höchsten mit massivem Kraftaufwand.
Da ich jahrelang am Hardtail mit 2-Kolben XT sehr zufrieden war, habe ich nach ein paar Wochen umgebaut. Jetzt bin ich zufrieden!
Super Bremsleistung und das mit minimalem Kraftaufwand am Geber. Es reicht ein Finger um über den Lenker zu fliegen. Überhaupt viel bessere Griffe. Sehr gute Qualität, einfache Entlüftung, kaum Geräusche, was will man mehr? :-)

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by Hans H. on 24.10.2022
verified purchase
item: black/set (front+rear)

je recommande chaudement, plus peur des descente avec ces freins ! + plaquettes "metal" et c'est le top.

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by Daniel P. on 22.08.2020
verified purchase
item: black/set (front+rear)
3 of 3 customers found this review helpful.

Perfekte Bremsanlage. Hinten etwas weniger Power, damit man gut dosieren kann.
Vorn etwas weniger gut zu dosieren, aber Power ohne Ende. Kann man eher als Wurfanker bezeichnen.
Bike Components war wie immer von der schnellen Sorte.

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