Hayes HFX 9 XC Disc Brake System

3.33/5 (199 Reviews)
MSRP : $149.00


Product Description

Compact aluminum body and lever blade All new design combines looks, functionand durability All-weather pad compound Reversible master cylinder mounts Reservoir system compensates for fluid expansion System weight 430 grams


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Reviews 1 - 15 (199 Reviews Total) | Next 15

User Reviews

Overall Rating:5
Value Rating:4
Submitted by ovi

Date Reviewed: July 31, 2014

Strengths:    Very good modulation

Weaknesses:    I ride those on my dh kona stinky, feels good but not as powerful for dh, still brake with one finger on 20 degree slopes, feels smooth with nice modulation but more power for dh

Bottom Line:   
Great brakes, easy to maintain, easy swipe pads, feels strong made, smooth with great modulation suitable perfectly for xc light dh

Overall Rating:3
Value Rating:3
Submitted by Larry a Cross Country Rider

Date Reviewed: March 5, 2013

Strengths:    OK when working well, reasonable braking modulation

Weaknesses:    master cylinder reservoir cap can come out,not quite a one finger braking system,
can be a PITA to centre caliper to pads,
long lever throw


Bottom Line:   
I have a love hate relationship with these brakes. Stock off a Marin Nail trail I had a sticky rear piston. I ended up resolving it by blowing out the pistons from the caliper cleaning them up and putting them back in.
The bleed process takes a bit of getting used to but once you got it sussed its straight forward. 1. Remove air from caliper 1st. 2. Push new fluid through system. 3. Positive pressure bleed, to reduce the lever throw. This is a MUST without doing this the lever throw is just ridiculous!
Although I have personally had a master cylinder reservoir cap come out during a trail run, I have managed to pop one out when pushing the pistons back in. This is a design flaw and does make me nervous that a cap could come out one day whilst on a trail!
Use fully sintered pads. This improves braking performance significantly. At the cost of considerably noisier brakes - doesn't bother me that much.
I don't think I will be rebuilding these, will instead upgrade to a better brake when that time comes.

Overall Rating:2
Value Rating:3
Submitted by mad_max911 a Racer from Osijek, Croatia

Date Reviewed: March 31, 2012

Strengths:    Level feel.

Weaknesses:    Caliper lock, frequent adjustment and bleeding, low stopping power.

Bottom Line:   
Pretty bad brakes, my avid bb5 mechanical is better all around.

Expand full review >>

Duration Product Used:   Less than 1 month

Price Paid:    $100.00


Overall Rating:1
Value Rating:2
Submitted by crazywheelz a Weekend Warrior from nh

Date Reviewed: July 21, 2010

Strengths:    good power

Weaknesses:    reliability

Bottom Line:   
probably the most powerfull brake i have used . when they are working right they rock ,but that in my case was seldom.they were great for a month then the rear wheel started draging got so bad the brakes would lock up at times. spent tons of money at shops trying to get it worked out .sqeuls constantly . finally figured out what the problem is and that the brakes tend to absorb moisture in humid climate and when the weather is hot the fluid exspands.it seems to be worse when the bike is stored for any lenght of time especialy if the bike is hung .who is these for someone who doesnt mind a lot of do it yourself maint. cause a shop gets too costly i could of bought 2 more replacements.who is it not for someone new to disc brakes these may totaly turn you off to them once they start acting up.

Expand full review >>

Duration Product Used:   More than 3 years

Purchased At:   came stock on bike

Similar Products Used:   avid bb5 ,deore disc

Bike Setup:   jamis xlt

Overall Rating:5
Value Rating:5
Submitted by Riggs a Cross Country Rider from PA< DC

Date Reviewed: April 4, 2010

Strengths:    Absolutely bulletproof

Weaknesses:    none

Bottom Line:   
The more time in the saddle the better off you are. Getting to know your equipment and how to maintain it takes time. Ideally these brakes need to be bled, with replaced rotors and OEM semi-metallic pads once a year. Lube all brake lever pivots often with Teflon oil. If you or the LBS tech know what your doing, these brakes have fantastic stopping power and are reliable 900.01% of the time. Better yet, don't bother bleeding yourself, pay a good tech who knows what their doing. Its worth it. Enough said. For the price, they are fantastic. Ride your bike often and maintain it well.

Expand full review >>

Favorite Trail:   Porcupine Rim

Duration Product Used:   More than 3 years

Purchased At:   OEM Trek Fuel

Bike Setup:   2006 Trek Fuel, Hayes HFX 9 XC Brakes, Deore XT all around, SRAM chain, MC 3.3 rear shock, Reba SL up front, Bontrager Race Lite Wheels with DT Swiss Hubs

Overall Rating:1
Value Rating:2
Submitted by aknoefel a Cross Country Rider from Sunnyvale, CA, USA

Date Reviewed: November 13, 2009

Strengths:    They are just o.k.

Weaknesses:    The calipers tend to jam, which feels like air in the brakes. It is a pain in the neck, taking off the tire, the pads, get both calipers aligned again, and reassemble, and not something you want to do on a trail, ESPECIALLY on a 30 degree downhill section.

Even freshly bled, the stopping power is under-impressive, compared to my Shimano XT V-brakes on my old hardtail.


Bottom Line:   
Due to their unreliability on the trail, find a different set.

Expand full review >>

Favorite Trail:   Saratoga Gap

Duration Product Used:   2 Years

Bike Setup:   2007 Giant Trance 1

Overall Rating:5
Value Rating:5
Submitted by GooGuk a Weekend Warrior from New Hampshire

Date Reviewed: October 22, 2009

Strengths:    They stop me when I need to stop and have plenty of modulation. Have used these for 4+ years, never bled, 6+ sets of pads. Low low cost.

Weaknesses:    When pads get low, stopping power starts to go too. Screw in the piston / lever loosens if you don't put locktight on it.

Bottom Line:   
These brakes were a year old OEM take offs when I got them for cheap from a friend. I've worn one set of rotors and am well on the way to wearing out another set of rotors. I've worn out 6+ sets of pads. The sintered Hayes pads make a huge difference in stopping power over the regular Hayes pads or Coolstop pads. For a cheap hydro brake, these have been champions for me. They are a little squirley with brand new pads (rubbing), but are fine once the pads break in a bit. These have followed 3 frame builds for me and still don't have any issues... pretty impressive. I wish my forks were this reliable!

Expand full review >>

Favorite Trail:   Any

Duration Product Used:   More than 3 years

Price Paid:    $50.00

Purchased At:   friend

Bike Setup:   Jamis XAM II frame, Rockshox Revelation fork, Hayes 9 brakes...

Overall Rating:3
Value Rating:4
Submitted by EJ a Racer from Denver, CO USA

Date Reviewed: October 1, 2009

Strengths:    Solid stopping power, good modulation, great in all weather

Weaknesses:    Levers (or something) sticks when pads get low

Bottom Line:   
They have been a solid XC/trail brake for me. When the pads get low, they start to get quirky, but otherwise, they are reliable and easy to maintain if you know what you are doing (and you really shouldn't be on the trail unless you have a rudimentary knowledge of bike maintenance) No unusual problems with noise, fade or rapid wear. And I'm 180 lbs at race weight, riding/racing in the Rocky Mountains. There's LOTs of extended descents...

I ran them on my DH bike for a year with 12" rotors, but replaced them with HFX Mags, which are much better. However, on my trail bike they are solid.

There's better options out there now (for more money) but I still run them and don't regret it.

Expand full review >>

Favorite Trail:   not tellin'

Duration Product Used:   More than 3 years

Purchased At:   Berserker Bikes

Similar Products Used:   HFX Mag, Avid mechanicals

Bike Setup:   current: Kona Dawg Primo, 140MM Fox, XT
Previously on: DEAN hardtail (race bike)

Overall Rating:3
Value Rating:4
Submitted by Ecogeek a Cross Country Rider from Calgary, Canada.

Date Reviewed: August 30, 2009

Strengths:    Good modulation. Adjustable stroke length. Held fluid well - until first bleed and resultant instant breakup of thread sealant on bleedscrews.

Weaknesses:    Crap bleed-screws. Will lose bleeder caps too. Crappy bleed kit for many reasons. Will squeak unless there's some lube on the back of the pads. Hayes pads not as good as they should be imo. Highly variable yet inexplicable changes in brake power (not bad bleed). First rear brake lost power. New pads fixed it. Now front has gone like the rear was. Pads like new in both cases, so probably slight fluid leaks contaminating pads. Cleaning pads/discs w alcohol doesn't fix it.

Bottom Line:   
When you bleed these, make sure you have some teflon tape handy. The bleeder screws are a bad fit, so they come covered them in thread locker/sealant to stop fluid leaking out of the threads. If/when you bleed them, the sealant will break up and then, no matter what you do, the brakes will not work until you've put some tape on the threads and rebled. Don't hope for the best because you'll waste fluid and will have to go out and get the tape and more fluid. Just get the tape - which is also good for other things like holding lever stroke adjusters in place. Bleeding is relatively easy, no thanks to the bleed-kit.

The bleed kit itself deserves a special mention. Thanks to the bleeder screw issue, I spent a lot of time with this kit and noticed a lot of annoyances. If you buy the brakes you'll need the kit at some point, so here's the deal. They actually suggest you go and get a spoke and bend it to hang the overflow bottle from the bars rather than include a 5cent hanger in the $20 kit!!! - Which otherwise consists of a tiny bottle, a tiny length of tube (which they also want you to cut yourself), one single bleed adapter (for your particular brakes) and some multi-model instructions some of which apply to your brakes but they're mixed in with instructions for other models. They also fail to mention the bleed screw sealant, or what to do if it leaks after following the instructions to the letter. The contents of this kit must cost less than $1. They leave out even a tiny piece of teflon tape (which costs 69cents a ROLL and is essential - see above), bottle hanger, spare bleed-fitting. The bleed fitting itself is a tiny bit of metal, again worth ~15c max. They should include at least one spare. Instructions should def mention the thread sealant issue. Using a bleed kit absolutely correctly shouldn't result in no brakes and a need to go and get something else (teflon tape) to fix. Bleeding the brakes does get easy fast with practice and some tape handy. I've bled mine about 8 times each now and don't need the instructs. Some of which do not lead to the best results anyway. For example, rotating your lever up above the bar IS a good idea. Instructs say it should be parallel with the ground.

Brakes themselves are good when they work right. They have much better modulation than the MX-2 mechanicals on my Mrs' bike, but not as much power even with a perfect bleed. They don't lack power when the pads/discs are clean/new, but you don't expect them to be less powerful than a mechanical set.
Value is ok. But they lose one flaming turd for the bleed screw, one for the bleed-kit, and if I could, a half more for the power falloff. In fact, I should probably rate 2 overall. If you make something that needs bleeding, you should make the bleeding process/kit bombproof, cheap, and correct; rather than expensive, incomplete and with questionable direction. 3 flaming turds as they're decent when they work - if you forget about the bleeding and the kit.

Expand full review >>

Duration Product Used:   2 Years

Purchased At:   Came w bike.

Similar Products Used:   Hayes MX-2 Mech.


Overall Rating:1
Value Rating:1
Submitted by brendan.kane a Cross Country Rider from christchurch, New Zealand

Date Reviewed: August 21, 2009

Strengths:    none

Weaknesses:    never functioned well, poor braking, always rubbed

Bottom Line:   
Don't wast your money. I threw mine away. My avid cable actuated were far superior I took plenty of time bedding in and adjusting and checking and rechecking and taking back to dealer to adjust. In the end I gave up. they are rubbish. If you buy them on a bike expect them not to work is my advice and you'll have to get others.

Expand full review >>

Duration Product Used:   More than 3 years

Similar Products Used:   juicy 7, avid cable actuated

Bike Setup:   kona hard, xt through, swiss dt wheels, exr pro marzocchi fork

Overall Rating:5
Value Rating:3
Submitted by Lethalail.com a Weekend Warrior from UK

Date Reviewed: July 16, 2009

Strengths:    Easy pad replacing , easy bleeding , perfect modulation.

Weaknesses:    heavy brakes , doesn't look cool :D

Bottom Line:   
The best hydraulic brakes ever i ride !

Expand full review >>

Duration Product Used:   1 Year

Price Paid:    $180.00

Purchased At:   2008


Overall Rating:5
Value Rating:5
Submitted by ronsfi a Cross Country Rider from Seattle

Date Reviewed: June 13, 2009

Strengths:    Modulation, quiet, strong.



Weaknesses:    Have yet to find any.

Bottom Line:   
I use my bike daily so they get a good workout and I have been very happy with my nines. They are perfect for my setup and have been quiet and reliable. I like them better than my Juicy 3s. Plus the great deal I got a Pricepoint makes these a no brainer.

Expand full review >>

Favorite Trail:   Happy!

Duration Product Used:   3 months

Price Paid:    $50.00

Purchased At:   Pricepoint

Similar Products Used:   Avid Juicy, Shimano mechanical.

Bike Setup:   Trek Valencia w/ Welgo dual pedals,XT Rapidfire, Hayes HFX, Speedcity wheelset, Armadillo 28s.

Overall Rating:2
Value Rating:1
Submitted by codydog1133 a Cross Country Rider

Date Reviewed: June 7, 2009

Weaknesses:    does not include mounting brackets and pads are not adjustable like other brands I have used. From the start the my rear brake leaked fluid from the fluid cap on the brake lever. Maybe I just had a bad freak bad experience but I will stick to Avids for now on.

Bottom Line:   
Buy Avid juicy 7s or better. I gave these brakes 2 chilis only because the front brake worked fine.

Expand full review >>

Duration Product Used:   3 months

Similar Products Used:   Avid juicy 7s

Bike Setup:   Rocky Mountain Vertex 70 1x9, XT components, SID fork, and Cane Creek wheelset

Overall Rating:2
Value Rating:2
Submitted by justodd a Cross Country Rider from Silver Spring, MD

Date Reviewed: May 15, 2009

Strengths:    Well, they stopped the bike and slowed it down when I squeezed the brake lever...

Weaknesses:    Just didn't seem to be that powerful and responsive as you would expect from a hydro in this price range. I've had Juicy Sevens that seemed much more responsive and reliable and have tried Elixirs which seemed more powerful and reliable. The Hayes came stock on the Anthem 1 I bought last week, and after my first ride today I'm planning on switching out to Elixirs.

Bottom Line:   
If the Hayes 9 is your first experience in hydro disc brakes you'll probably like them. If you've had your hands on other hydro systems you'll probably think you are riding mechanicals. Suit yourself.

Expand full review >>

Favorite Trail:   National Trail, Phx, AZ

Duration Product Used:   Less than 1 month

Purchased At:   Hudson Trail Outfitt

Similar Products Used:   Avid Juicy Sevens, Elixir

Bike Setup:   07 Giant Anthem,stock, crank bros smarties, 2.3 Weirwolf up front, 2.1 Nevegal rear

Overall Rating:5
Value Rating:3
Submitted by jumping downhill womper a Downhiller from Nelson, SI, New Zealand

Date Reviewed: May 4, 2009

Strengths:    Very grabby, great stopping power, low maitanance, common, Good feel and adjustment, look cool, durable (strong)

Weaknesses:    Expensive for parts, loose power when heated... ,not enough different adjustments, hard to self maitain (not recomended)

Bottom Line:   
Don't be put off by these, you need a change of if you are!! Best brakes iv every owned or used, highly recomened. Best use would be on a downhill, freeride or a dirtjump bike. Not for your milazo supermarket bike or your grannies cruiser.

Expand full review >>

Favorite Trail:   Kaka Hill

Duration Product Used:   2 Years

Purchased At:   Cycle Surgery

Similar Products Used:   juicy3,5,7, hayes sole, other type hayes 9, v brakes ha ha

Bike Setup:   07 Giant STP1- 09 bomber 66rc2-funn rims-08 shimano mech-hayes 9!
07 Norco A-Line-hayes 9!- 08 203mm bomber rc-fox shock-08 sram mech

Reviews 1 - 15 (199 Reviews Total) | Next 15

Review Options:  Sorted by Latest Review | Sort by Best Rating


Hayes HFX 9 XC compression bushing

Im in need of a couple of Hayes HFX 9 XC compression bushings, I can only find them in bags of 10...anyone know where I can get a couple? Only have one shop in my area and the dont have them.Read More »

Hayes HFX 9 XC, good buy for only $50?

I did a search but couldn't find any posts about the Hayes HFX 9 XC brakes. Pricepoint has them on sale for only $50 each set. Are these decent brakes for XC use? I'm not super concerned about their weight and I only weigh 154 lbs. so they wouldn't be worked that hard. If these are not that good ... Read More »

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Hayes HFX 9 XC Question

I got a great deal on a 2004 Liquid 55 frame ($50) and am building up this bike as an upgrade from my '09 Trek 4300. When it comes to brakes I have decided to try out hydros and think the Hayes HFX 9 XC will fit the bill nicely. I have heard that it is pretty common to run a 7" front and 6" rear r ... Read More »

Hayes HFX 9 XC Carbon

I'm currently running Deore 535 hydraulics. Been thinking about upgrading and price point has the 10th anniv. Carbon/Chrome on sale for $80/side. Is that a good deal for these brakes? I've read reviews and they seem to be a good set. Secondly, is there going to be a decent weight savings, as bra ... Read More »

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