Shimano Deore BR-M6120 Disc Brake Set J-Kit - black/set (front+rear)

Shimano Deore BR-M6120 Disc Brake Set J-Kit

Item number: 77743

Shimano Deore BR-M6120 disc brake set - brake power for Enduro

The Shimano Deore BR-M6120 disc brake set with front and rear brakes is designed for tough Enduro and trail use, because it has powerful 4-piston brake calipers. These are controlled by aluminium 2-finger brake levers with adjustable reach. The Servo Wave construction helps to optimally control the braking force. Split clamps are available for mounting the brake levers and the I-Spec EV interface also allows combination with matching shifters. The BL-M6100 has been equipped with an extra support point on the handlebars, which gives more control and stability. Funnel bleeding and One-Way Bleeding technology, which prevents air bubbles from remaining in the caliper, make maintenance easier. As a J-Kit, this brake set is delivered in such a way that you can install it easily, even if the brake hoses on your bike are routed internally.

Guidelines for Replacing E-bike Components:

Before you replace components on your e-bike, please read through the guidelines for component replacement for CE-marked e-bikes/pedelecs with pedal assistance.


Deore M6100
Enduro, All Mountain
hydraulic, 4 pistons
mineral oil
Hose Length (Front/Rear):
1000 mm/1700 mm

Technical Information - Caliper:

Caliper Mount:
post mount
Calliper Material:
Piston Material:
Hose Connection:

Technical Information - Lever:

Lever Length:
Adjustment Options:
reach adjust (with tools)
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: SM-RT54, SM-RT56, SM-RT64, SM-RT66)
organic and sintered; with narrow pad shape; standard brake pads (no Ice-Tech)
EP8 EP800 for MTB / Touring, EP6 for MTB / Touring


Brake Caliper:
  • consistent, reliable braking performance in all conditions
  • more safety and control on steep descents
  • first-class response for high performance
  • 4 ceramic pistons
  • approved for use with transport and cargo bikes
  • painted
  • steel bolts (5 mm)

Brake Lever:
  • intuitive and powerful braking
  • with additional support on the handlebars for more stiffness, better controllability
  • faster response due to reduced empty travel
  • I-Spec-EV-compatible: 10 degree rotation angle for shifter
  • funnel venting with M5 funnel
  • anodised lever, painted body, stainless steel clamp bolt


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:

EM61201JLFPRA100 (front) + EM61201JRRXRA170 (rear)


  • 2 x Shimano Deore BR-M6120 + BL-M6100 disc brakes, front & rear
  • 1 x Shimano SM-BH90-SS brake hose, 1000 mm (front)
  • 1 x Shimano SM-BH90-SS brake hose, 1700 mm (rear)
  • 2 x pair Shimano brake pads, resin
  • 2 x insert
  • 2 x olive
  • 4 x calliper bolts
  • 2 x snap ring
  • ready for installation, filled, bleeding is recommended after installation

Order Together:

  • 100 day return period
  • Online since 1998
  • Trusted Shop 4.85 / 5.00


  • black/set (front+rear), in stock

Customer Reviews (4)


Customer Reviews (4)


Give us your opinion on this product.

by Lee P. on 28.06.2022
verified purchase
item: black/set (front+rear)
1 of 1 customers found this review helpful.

Good set of brakes. The insert pin was a bit tricky to get into the hoses after cutting to length, even with the clamping block. After a funnel bleed, braking performance is very good, and it is easy to scrub speed coming down steep descents without locking the wheels too fast. When you do need to stop fast they are incredible, they show up the limit of your tires fast so that's the next purchase!

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