Shimano 2 Piston Finned Pads J04C & J03A


Shimano 2 Piston Finned Pads, J04C & J03A

Finned replacement pads for Shimano XTR BR-M9020, XTR BR-M9000, XT BR-M8100 and SLX BR-7100 brakes.

J04C – Metal:

Rigid compound designed for longer service life, high power in severe conditions, muddy and sandy conditions.
pn: Y8LW98030

J03A – Resin:

Flexible compound designed for less noise, focus on controllable performance, designed for wet and dry conditions.
pn: Y8Z298010


To better serve a greater number of riders we have implemented a maximum quantity per order on many service items.

Brake Pad Limit: 2 sets (enough for 1 bike)

SKU: BPSHI4C3A2p Categories: , , , Tags: , , , , , , , ,


Shimano 2 piston finned pads utilize the additional material to radiate heat away from the pad designed to improve pad life and reduce brake fade.

shimano j04c metal brake pads with fins pn: Y8LW98030

Shimano J04C Metal Pad with Fins

UPC: 689228919600

Metal pads are rated for high stopping power.

shimano j03a resin brake pads with fins pn: Y8Z298010

Shimano J03A Resin Pad with Fins

UPC: 192790452371

Less noise than Metal pads

Shimano M900 M9020 M8100 M800 M7100 M7000 M6000 finned pads

Shimano J03A and J04C Compatibility

Compatible with Shimano 2 piston brakes including:

XTR BR-M9000, XTR BR-M9020
XT BR-M8100, XT BR-8000
SLX BR-M7100, SLX BR-M7000
Deore BR-M6100, Deore BR-M6000

BR-M987, BR-M985, BR-M785, BR-M675, BR-M666, BR-M615, BR-S700, BR-RS785, BR-R785

Other Shimano 2 Piston Brake Pads

Shimano XTR M9000, XTR M9020,  XT M8100, XT M8000, SLX M7100 and SLX M7000 use J03A or J04C finned pads on this page or the G03A, G03S, G04S and G04Ti non-finned options.

shimano G04Ti metal pads pn: Y8LW98010

Shimano 2 piston pads G04ti, G04S, G03A and G03Swithout fins will work with brakes spec’d with J03A or J04C pads.

XTR 9000 and 9020 versus XTR 9100


shimano XTR M9000 vs XTR M9100 brake pads

Shimano XTR BR-M9100 brakes, lower caliper in image above, use K04ti, K04S and K03S pads. linked below.

Shimano XTR M9100 brake pads

Shimano 2 piston pads J03A or J04C with fins will work with most brakes spec’d with G04ti, G04S, G03A and G03S pads.

Shimano 2 piston brake pad compatibility

Do You Need To Replace Your Rotors As Well?

The nature of brake pad and rotor interface means they will wear together. Ideally you will be able to replace your brake pads a few times before you need to replace your rotors. however there can be some conditions that make it necessary to replace the rotors sooner. Let’s look at a few.

Rotor Wear:

Magura Shimano SRAM Rotor Wear Limits

The easiest thing to check is the rotor wear limit.

A Magura rotor that is less than 1.8mm wide is considered worn. SRAM rotors less than 1.5mm are worn. Shimano rotors less than 1.5mm or if any of the aluminum “Ice-Tech” material appears are considered worn.

Running too thin of a rotor will compromise brake bite as well as heat capacity. In extreme cases it can lead to rotor separation which will cause damage and potentially severe injury.

Rotor Shape:

Rotor Wear Issues

If the previous pads have worn shapes into the rotor your performance will be compromised. Whether the rotor shows knife edge, bulge or convex anything but parallel surfaces will cause contact patch issues.

These issues will create extreme “hot-spots” on the new brake pads which, in some conditions, can super heat the pad – glazing it and compromising the friction coefficient (bite, power, heat capacity are all effected).

We have seen cases where new brake pads become unusable due to this severe heat modifying the pad’s makeup glazing not just the contact surfaces but essentially glazing the entire pad material.

Contact issues between new and old pats and rotors

A rule of thumb is rotors should be replaced about every three or four sets of pads. It will pay dividends to check the rotor’s condition before installing new pads!

Shop MTB Rotors Here

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Compound Options:

J04C Metal, J03A Resin

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