Shimano Deore M6000 brakes first impressions & weight

I will keep you updated on how these perform, and if I destroy them or not.

Make sure to apply Loctite to the threads for the reach adjustment, the lever will come out of adjustment quite fast without doing so.

I noticed the paint on the bleed screw was wearing off after on the first ride.

Tesa Grip Tape as brake lever grip after few weeks

I installed Tesa Anti Slip Tape on all controls including the brake levers, no more slippery brake levers.

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A closer look:

e13 Dropper post remote 17J V10SS;
Tesa anti slip tape on XTR M9000 shifter

I replaced the Stock Resin pads with Shimano ICE-TECH J04C metallic pads, for longevity and stopping power.

Weight:

Shimano M6000 Original Resin standard pads,, Uncut 1700mm hose
Shimano M6000 finned metal pads, Uncut 1700mm hose

Pros:

The narrower clamp allows closer shifter placement, which is what I was looking for. I ran a TRP Spyke lever for months but it did not allow me the perfect shifter position, so I had to choose best brake leverage or better shifting ergonomics, but with Shimano M6000 I don’t have to choose.

  • Ergonomic lever blade, they got it right. it’s better than the TRP Spyke & M930 levers.
  • I like the light lever feel, there is enough lever trow so it’s easy to control the braking with minimal fatigue, I can’t feel any friction or play in the lever.
  • You can use XTR finned pads.
  • The reach adjustment is easier to access than the previous model (M615).
  • Minimal play in the lever, there is maybe 1 mm play or less.

Cons:

  • The housing kinks easily
  • The housing scratches very easily, after installing zip ties and removing zip ties I noticed the hose was quite scratched up.
  • Play in the hinge causing the lever to rock back and forths the handlebar.
    The plastic cover is concerning, it’s not so exposed as other components.
  • The rear brakes i got had too little fluid, so the pads were too far from the rotor, I installed one rear brake first, and and it felt wrong, I tried another brake, and same problem but it was slightly firmer, I haven’t tried all of the brakes I got, but I will have to fill them with more fluid.

March & April 2019

I had issues with air in the system and spongy lever feel, and inconsistent braking power, I cleaned the rotor, pads, sanded them, the brake were bled to perfection, I rode and the air bubble came back, the same feeling, the inconsistent braking power, and spongy feeling, and pads getting glazed.

I think this is due to worn seals, causing leaks contaminating the pads, letting air in.

Seals wear out, and need to be changed, that’s normal, but they don’t come with spares, and you cna’t buy spares, so you have to contact Shimano to get spares I think, unless they will send you a new brake.

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Long term review on 3 bikes: Shimano Deore M615 I-Spec-B brake set

.I have used these brakes on 3 bikes, some more than others, until they failed.

Cons:

  • No banjo fitting
  • The brake lever body/Master cylinder flex when braking harder than 50%,which is why the plastic lid & the separator &  the Master piston unit to bend or get damaged, and cause leaks, so the lever will be soaked in oil, and oil will spit out through the middle where the plastic lid is.I compared the flexing in the levers on m396&m615 and there is significantly more flex in the m615, if you press the lever blade half way you wont see flex on the m396,but on the  m615 you will.
  • Leaking caused by plastic cover bending upwards, and front and the back is also being pushed upwards but sideways too, causing a leak.
    temperature changes, will cause changes to the materials, a minor hit can cause this. the design is clearly flawed.
  • I had to replace one master cylinder due to failed threads, and I had the leaking issues with the new one too.

The threads for the Torx screw failed, which is clamping the cover which clamps down the grommet, SO fluid leaked. but the Torx screw was not damaged. In my opinion these screws are way too small,the design is way too fragile.

  • Impossible so far to get placement seals/grommets/diaphragms, or just the master cylinder separately.


The cause of failure was certainly not over torquing  the screws, It certainly was not a crash that caused it,because I never crashed with this particular brake.

 

Pros.

  • Hinged clamp,no need to remove grips & shifter.
  • the levers are easy to bend back if you bent them,which I have done on 2 bikes so far.
  • good modulation
  • good braking power,at least if you use Metal pads
  • it’s not too  expensive
  • it’s not too heavy
  • no need to take off grips to take off the brake, because of the swing arm clamping mechanism.

The Brake Lever will bend if you crash into a tree(before I upgraded the handle bars i was used to ride on the fuel ex 7 with 720 bars),at low-speed,don’t just let the bike fall on the ground,it can bend the brake lever.

  • 23779701854_0a5eeb02bd_b

You can of course bend it back with proper tools and technique.

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The I spec B system, is flawed, it’s quite flimsy, the shifter will move if you did not use Threadlocker and torqued it properly,

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2016 Shimano Deore XT M8000 Ispec B shifter mounted to Deore M615, (there is no B on the brake but its compatible jsut look for the I spec B holes) i know  the brakes are bit steep in this picture but I have tweaked that later.

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The Deore M615 on a 2010 trek 6300

Extra Info

M615 Piston seals: the number written on pistons seals.

IUY 21.1 25  3.19 78 NOK

Verdict:

The Both brakes are too fragile.

Because the brake lever body/master cylinder is way too flexible and that there is a palstic lid,instead of metal lid,which causes the brake to leak.

I have seen a lot of reviews claiming these brakes are a good value at a low price point.

I agree with the braking power for the money is there, but not the reliability, these brakes are too fragile.

same goes for the other brakes with the similar design, for example, M396, M395, but at least it’s possible to get Reservoir Lid Unit for M396, M395.

Failed tHreads on M396 right lever/rear lever.

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