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Avid X0 Trail Hydraulic Disc Brake Set (discontinued)

Average User Rating: (Good)
Avid X0 Trail Silver
 Avid X0 Trail Hydraulic Disc Brake Set  Avid X0 Trail Hydraulic Disc Brake Set
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Avid X0 Trail Brakeset Review

Rating: Featured Member Review
The Good:

Efficient braking; low lever input with high stopping power

The Bad:

Not a deal breaker by any means, but set up time requires setting pads for desired lever throw.

Overall Review:

With SRAM releasing a full line of “Trail” specific brakes it’s about time for some feedback on the X0 Trail brakes that were released last year. The X0 Trail brake is aimed at the Enduro, all-mountain market and utilizes a 4-piston dual-diameter caliper. What’s unique about their design is the piston sizing, with the leading pistons being smaller than the trailing pistons.  This allows the smaller piston to engage the pad first creating a “toed” engagement, resulting in more modulation at the lever. Another update over the X0 Elixirs is a redesigned TaperBore master cylinder.

I installed these brakes with 160mm HSX rotors on my Giant Trance X.  At 25 lbs, a slack head angle, and low bb, this bike was a perfect candidate for the install and test. I’ve had about 2 months on these so far with trail type and conditions varying quite a bit.  Long XC rides, steep descents, and a little bit of jumping gave these brakes a run for their money.

First off, let’s get the “bad” bleed and noisy rotor gripes of the past out the way since I feel that have been resolved.  With these brakes the bleed port on the master cylinder has been relocated to the low pressure side.  What this results in, is less chance of air sneaking its way into the master cylinder.  With the old style, the bleed port was a part of the pad contact adjustment, on the high pressure side, and this would result in difficult bleeding for some and the chance for air to sneak into the system with use due to the complexity of the adjustment.  With these improvements the brakes didn’t require an initial bleed and haven’t required one yet.  Something I wasn’t able to say about the Elixir CRs I settled with using on this bike previously because they weren’t consistent enough when set up on my downhill race bike. I can say the bleed location change was definitely the improvement because getting rid of the pad contact adjustment by using Code Rs on my DH bike fixed the consistency issue.

Avid did look into the rotor noise and you’ll find that the new HSX rotor no or little noise with appropriate set up and “normal” use.  I did find that under some extremely heavy braking you could hear the infamous turkey gobble trying to break out.  However, I can’t view this as a fault as it only occurs at extreme loads.  Braking causes friction, and friction generally causes vibrations and finally vibrations are noise.  I want my brakes to cause friction so I’m ok with a bit of noise under heavy braking.  It means they’re working.

Now onto what has impressed me quite a bit with these brakes.  This wasn’t my first 4-piston brake so I had quite high power expectations and was very impressed with the amount of power on steep descents with 160mm rotors though.  The biggest thing I noticed is something I’m going to call an efficient lever feel.  Not once have I noticed any signs of arm pump.  Generally on longer descents for the beginning of the season I would expect a bit of pump but this never happened.  I’m pinpointing this on the lever feel and power you get.  When pulling these brakes in you never get that “wall” feel.  Some may say this is a “spongy” feel.  I’ve overlooked this parking lot feel and focus on how the lever feels on the trail.  On the trail I never once noticed any sponge or felt I was using strength to grab a bit more brake.  What surprises me is the lever feel under last minute braking.  This is when you expect to use a ton of effort pulling that lever in to get that power to make the turn.  I’m constantly surprised entering corners with relaxed hands but skidding/drifting my tires into the perfect line.  This performance can be pinpointed to their 4-piston caliper with dual-diameter pistons.  Once the larger, trailing piston, engages towards the end of the lever stroke power is greatly increased without any change in lever feel (something you don’t get with the cammed, Servowave lever).  What I like to call this is an “efficient” lever feel.  With relaxed hands, I’m able to ride looser, smoother, longer and happier.

Overall, I would say the X0 Trail brakes are a huge improvement over the previous generation Avid brakes.  Improved bleed, power, and lever feel are all noticeable and the only thing I felt was a bit off is lever feel during the parking lot test.  This mild “sponge” feel was gone on the trail and not once noticed.  The power was always there when I needed it and I never felt like I was death gripping my lever for more power.  This brake is perfect for the all-mountain, trail, and evolving enduro crowd with its massive power, efficient lever feel and durability all in a nice light package.

its like an ex-gf

The Good:

if its the only thing you know they are good

The Bad:

once you try others you will want to switch

Overall Review:

When owning these they seemed like they work just fine, the longer levers were cool and the match making system was simple. Well that was all fine and dandy but once you start a new relationship you look back and say ehh. These brakes did the job with the common braking and modulation you hear about. In my experience they seemed to fade, not all to easy to maintenance and they were temperamental. They were light enough and the 4 piston is a positive as to where people rock these on their trail bikes but imo there are far better brakes out there. I personally prefer shimano and now have 4 other friends that jumped from these to the shimano ship now. These seem to fade even after a fresh bleed when needed the most or they grab sometime unexpectedly  (dont believe me look up a youtube search). There are people and friends that have these and will never switch in being their preference so being that these still stopped me but with some other issues i give them a 3

Avid XO brakes (not trail version)

The Good:

Good power and modulations. Good looks. Great when working. Avid replaces without question.

The Bad:

Incredibly unreliable.

Overall Review:

I bought a bike that came with Elixir CRs. These had a leak at the seals in the caliper before the first bleed. After replacing the seal I bled the brake and the lever developed a leak and would not hold pressure.  The lever leak proved to be the only reliable thing about these brakes.  I replaced them no less then 4 times in a year.  Avid went ahead and did every time  but every time they needed a bleed after 1 or 2 rides then blew a seal during the bleed.

I loved these brakes when they worked but they never seemed to work. I'm 200 lbs and ride mostly steep fast down hill stuff and found these brakes had plenty of power and modulation.  However, I won't be buying Avid brakes again.  I replaced them with XTs and and miss the good looks, adjustability and carbon lever of the XOs but so far the XTs have been just as powerful, quieter and 1000 times more reliable.

Sorry Avid.  I gave you more chances than you deserved.  I'm done.

AVID's were always ok....

The Good:

Strong but not sneaky strong (stupid ad). No fade, predictable, great modulation and lever feel. Not On/Off.

The Bad:

Avid stigma of being garbage.

Overall Review:

I like my Code brakes a lot and oddly enough I liked my Elixir 5's that came with my Banshee Paradox. I did have a set of Elixir CR's that were good but not great. They faded, needed bled twice a season and gobbled like a turkey regardless of the weather or season.

The XO Trail Brakes however are excellent. Very strong and they don't have the full on/full off feel other brakes in this niche do. My buddies all ride Shimano and swear by it, as they should because their brakes are excellent but I have to say I prefer XO Trail brakes to anything else I've tried. They even say that my XO's feel excellent. To get super zealous Shimano guys to admit anything SRAM feels good means that they knocked it out of the park with these. Given how well these have performed I feel like they'd be equally at home on a DH bike as they are on my Trail/AM bike.

Beyond the braking performance I have to say these brakes look good too. Clean lines and fit well on the bars. Mating them up with SRAM's match maker is a must. With bars getting overwhelmed with cable/hoses its real nice to have something like match maker for a hint of sanity in bar cleanliness.


Product Avid X0 Trail Hydraulic Disc Brake Set
Riding Type Cross Country, Trail, Freeride / Bike Park
Lever Material Carbon Fiber Lever
Mount Style Post Mount / IS
Rotor Sizes 140(rear)/160/170/180/200mm
Rotor Mounting 6-Bolt IS
Fluid Type DOT 5.1
Colors Special Ops Black, Polished Silver
Weight 0 lb 12 oz (340 g)
Miscellaneous Open System // 4 Piston // Dual Diameter // Aluminum Body // 2 Piece Forged Aluminum Caliper // Top Loading Steel-Backed Organic Pads // Ambidextrous Mount // Contact Point Adjustment // Banjo Adjust // Lever Bearings // TaperBore Technology // MatchMaker X Compatible // Split Clamp
Price $290
More Info

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