Shimano Brake Hydraulic Lever Bl-Mt501 Rear 1700Mm
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The Shimano BL-MT501 / BR-MT520 Rear Hydraulic Disc Brake (Resin D01S pads) is a high-power 4-piston MTB braking system designed for XC, trail, and light enduro use, combining strong braking performance with Shimano’s smooth hydraulic control.
Shimano BL-MT501 / BR-MT520 4-Piston Rear Disc Brake (D01S Resin Pads)
What it is
This system includes:
- BL-MT501 hydraulic brake lever (right rear setup)
- BR-MT520 4-piston caliper
- D01S resin brake pads
- SM-BH90 hydraulic hose (1700mm, cuttable)
It is a complete Shimano hydraulic rear brake assembly (pre-bled system depending on retailer).
Key features
4-piston caliper (BR-MT520)
- dual opposing pistons per side
- larger pad contact area
- stronger and more consistent braking force
- improved heat control on long descents
Servo Wave lever technology
Shimano’s Servo Wave system:
- increases pad contact quickly at lever pull
- then multiplies braking force through the stroke
- gives strong power with good modulation
D01S resin pads
- quiet braking performance
- smooth, progressive feel
- good control in mixed conditions
- slightly faster wear than metallic pads
Hydraulic system features
- Mineral oil system (Shimano standard)
-
One-way bleeding technology
- easier maintenance
- more consistent brake feel
-
Post mount caliper
- standard MTB frame compatibility
-
Tool-based reach adjustment
- allows lever ergonomics tuning
Hose (SM-BH90-SS, 1700mm)
- MTB-ready rear brake length
- can be cut to fit frame size
- requires re-bleed after shortening
Ride feel
- strong initial bite from 4-piston caliper
- very stable braking under heat and load
- smooth, predictable lever feel
- excellent control on steep or technical terrain
Best suited for
- XC mountain biking
- trail riding
- aggressive recreational MTB use
- riders upgrading from 2-piston systems (MT200/MT400 etc.)
- mixed terrain riding with long descents
Pros
- significantly more braking power than 2-piston brakes
- excellent modulation (not grabby)
- strong heat management
- reliable Shimano hydraulic system
- quiet resin pad operation
Trade-offs
- heavier than entry-level brakes
- resin pads wear faster than metal pads
- not as refined or lightweight as XT/XTR
- requires correct setup (hose cut + bleed for best performance)
Bottom line
The Shimano BL-MT501 / BR-MT520 rear brake is a powerful 4-piston hydraulic disc brake system, offering strong, controlled braking and excellent trail performance, making it a very solid upgrade for riders wanting more confidence and stopping power on technical terrain.
