MTB brake parts and accessories

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Maintaining and repairing MTB brakes

A hydraulic disc brake requires little maintenance, but a few very specific parts. Shimano, SRAM, Magura, Hope, Jagwire and Elvedes cover bleeding, repairs and hardware.

Which brake fluid?

  • Mineral oil from Shimano and Magura: stable over time and does not absorb moisture.
  • DOT from SRAM: performs better at high temperatures, but is hygroscopic, so it must be replaced periodically.
  • Both must never be mixed : one mistake will destroy the system seals.
  • Each brand requires its exact specification, including between two DOT fluids.

When should you bleed the brakes?

  • After any hose cut or replacement.
  • When the lever becomes spongy or the bite point moves closer to the handlebar.
  • As preventive maintenance, once a year for a DOT system, less frequently for mineral oil.
  • The bleed kit is brand-specific : fittings and reservoirs are not universal.

Which wear parts should you plan for?

  • Olives and inserts : required every time a hose is cut.
  • Piston seals and pistons : to restore a leaking or sticking calliper.
  • Calliper and disc bolts : often lost or damaged during removal.
  • Brake pad springs and pins : small parts that are easily lost in the workshop.

Precautions

Protect discs and pads throughout any work: a trace of fluid or degreaser on the braking surface results in a loss of power and persistent noise, which can only be corrected by light sanding or replacing the pad material.

To find out more: How to choose an MTB bleed kit

See also: MTB brake pads · Hoses · Brake maintenance