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CX Brakes(13 posts)

CX Brakeseppster
Aug 26, 2002 8:47 AM
OK,

I've got my road/mountain mix drivetrain (105/XT/LX) running AOK on my new Kelly, but my brakes are killing me.

The bike came with a Tektro Mini-V rear and a STX canti up front. Replaced both with a spare set of XT v-brakes. They do the job, but admittedly they are a little mushy. As such, Travel Agents may soon be forthcoming.

My primary issue is that the front howls like a banshee. The rear works fine. I've tried cleaning the pads/rims, setting the pads up with toe-in & perfectly straight. Regardless, unless I'm administering full pressure, they shriek. Could it be the rims - Mavic CPX21(?) w/ Deore hubs? I've also tried running a brake booster to lessen fork flex to no avail.

New pads will be next, but I want to make sure I'm not missing something simple/basic here.

Thanks in advance for your help,

Sean
re: CX BrakesTWD
Aug 26, 2002 9:44 AM
The XT V-brakes have a pretty bad reputation for sqeualing. Seen many many posts about this over on the brake forum on MTBR. Don't recall anyone finding a fix for it, other than buying different brakes. It still might be worth searching the archived posts over there.
re: CX Brakeswspokes
Aug 26, 2002 10:21 AM
First, regarding the mushy feel. What type of brake levers do you use? "Certain" traditional road levers will feel mushy. I have a set of older Ultegra 600 on my cross and they work wonderful yet I had 105s on before and they were terrible. I use a dia compe 287 lever on my other cross and it works really well. I have a newer self-built up Surly and an older Bianchi Project bike.
Brakes:
Sand the brake pads lightly between rides and clean the rim well with rubbing alcahol or some other caustic agent (just kidding, you get the point). keep them toed in a bit. I wouldn't say it would be rims though. Try different pads. I noticed an immediate improvement when I switched to Kool Stop pads! Immediate! These are just suggestions and I know things don't always work the same for everyone.

Good Luck!
I'm using...eppster
Aug 26, 2002 1:41 PM
...105 STI lever/shifters. I knew they would be mushy, but I can stand that (until I get TAs). It's just the howling I can't stand. Never did it when on my MTB prior to being replaced by Hope Mini's.

Thanks for the advice. Will try new pads and TAs.

Sean
also try...seamus
Aug 26, 2002 6:48 PM
I've had a horrible time with brake squeal on my mtb. Turned out the problem was non-ceramic pads on ceramic rims, and the only solution was to go with ceramic pads (wtb, avid and shimano offer 'em) but in your case, the opposite may be true, you might be running ceramic pads.

Also, V-brakes with parallel-push linkage (xt, xtr) can get worn, and the flex in the linkage can cause squeal. There's a rebuild kit of washers and stuff to take up this slop, and that might help. Other than that, I can't say enough good stuff about my Paul's Retro front and NeoRetro rear canti's, it's all the brake power you'll need on a cross bike.

Good luck,

S
I don't have STIswspokes
Aug 27, 2002 3:57 AM
I don't have STIs, just regular ultegra 600s with bar ends. Not sure if this makes a difference, but it makes sense that it may! Good luck again.

Walt
Cross brakesjjohnson05
Aug 27, 2002 5:16 AM
Ditch the mountian bike brakes! I use Radius brakes on three cross bikes with great results. I use campy ergo, campy non-ergo and 105 levers and they all work well, with no need for any additional hardware. These brakes are designed for cross and are relatively cheap, about $40.00 a set. Most mail order sellers have them.
TA's and XT V'sOffRoadTourer
Aug 27, 2002 5:22 AM
I have Travel Agents on my Sora STI units with Avid SD3 V brakes and they work sweet, nearly as good as my MTB's V brakes. Can't recommend them enough, but be very careful with your set up, follow the instructions to a T, there's potential for BIG mistakes there.

As for XT V's developing slop etc. Whatever! Slop does very little to braking power and does not cause squeal, I know because my MTB has sloppy XTs and they work fine. The washer kits are complete crap - they dont rebush the worn section, just squeeze it vertically between fatter washers, which is a very dodgy way to fix the problem.

I would guess your squeal is due to new pads that haven't scuffed up yet or your ultra flat toe-in. I know Vs aren't theoretically supposed to need it but a very small amount of front end toe-in can stop the squeal (sometimes flat to the eye is ever so slightly toed-in to the rear in reality).

Enjoy those TA's when you get em.
My Sachs Suckadventurefind
Aug 27, 2002 6:08 AM
I have Sachs cantis on my cross rig and my front brakes always squeal like a pig at a county fair.
I tried different stuff like Avid V'brakes, Kool pads, etc. Nothing. I have sanded them, cleaned the rim, toed the pads in, etc. So I went and put the original pads on the brakes. Seems like the squeal is here to stay.
For lite wait, high clearence, high power breakstriple shot espresso
Aug 27, 2002 8:12 AM
the absolute best breaks are the Spookys
http://stores.yahoo.com/cyclocrossworld/spookcycbrak.html

V breaks are mushy and have no mud clearence and the required lever throw is to great.

good luck-
Shakey
For lite wait, high clearence, high power breaksatpjunkie
Aug 27, 2002 8:01 PM
triple espresso, are you so amped you forgot how to spell or are you being funny?

Light Weight, high clearance, high power brakes

....lever throw too great.

I'm not trying to flame ya but you should chalk up on your English. Excercise both mind and body.
watt due u mean?triple shot espresso
Aug 28, 2002 6:46 AM
I spell find.
watt due u mean?atpjunkie
Aug 28, 2002 4:02 PM
Mike Watt is a sweet bass player, and not the fish kind.
U spell grate. küdn't tell if ewe were overamped on calffiend
or just beeing seely