#11
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Disc Brakes...
"John Harlow" wrote in message ... I'm not so sure disc are a good idea for long steep descents. I have them (Hayes) and frankly the small rotors don't have enough surface area to dissipate the heat. They burn up while the rim brake riders have no problem. This seems to be the one (infrequent at least in my case ) downside with discs. Once they get superheated they seem to severely loose effectiveness too. You might have marginally better luck with larger (8 inch) rotors. What?! Must be those 'Comp' level brakes. ;^) No problems with my 8in Hayes Mags or 5 1/4" Hope Minis. Wow. Apparently I am the only one to have ever had this happen. But careening down a narrow mountain hillside with a rapidly approaching switchback and a fistfull of brake lever fading to virtual nothingness got my attention. BTW, it wasn't the comps either - it was the stock ones on the Giant. Yeah, I don't know, my Hayes Mag on the front wheel has been perfect, and I even use far less rear brake with it that I used to with my v-brake. So I don't know what the deal is. A. |
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#12
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Disc Brakes...
I'm looking for a good hydraulic disc brake system. I do pretty aggresive
cross country riding, meaning I look for very steep very technical trails to ride both up and down and thow in the moderate connecting trails. I'm curently using the Shimano brakes that came with the 2002 Specialized Enduro, I believe they are the M525 hydraulic disk brakes. The problem is that as the pads wear, the 2 pistons don't move in the same amount so 1 pad will start rubbing and in turn sqeel. They also start to fade a bit after a long steep decent. I'm sure I would like the Shimano XT, or some Hayes equivelent disk brakes but I was wondering if there were some different brands like Grimeca, Hope, or Magura that someone would have some input on. Input on Shimano and Hayes would also be welcome. Thanks for any help on this topic. TJ Simply put, avoid hope like the plague. They look nice but are absolutely ****e. Small Black "i detest my Hope m4 setup" Dog |
#13
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Disc Brakes...
Small Black Dog wrote in message ... I'm looking for a good hydraulic disc brake system. I do pretty aggresive cross country riding, meaning I look for very steep very technical trails to ride both up and down and thow in the moderate connecting trails. I'm curently using the Shimano brakes that came with the 2002 Specialized Enduro, I believe they are the M525 hydraulic disk brakes. The problem is that as the pads wear, the 2 pistons don't move in the same amount so 1 pad will start rubbing and in turn sqeel. They also start to fade a bit after a long steep decent. I'm sure I would like the Shimano XT, or some Hayes equivelent disk brakes but I was wondering if there were some different brands like Grimeca, Hope, or Magura that someone would have some input on. Input on Shimano and Hayes would also be welcome. Thanks for any help on this topic. TJ Simply put, avoid hope like the plague. They look nice but are absolutely ****e. Small Black "i detest my Hope m4 setup" Dog I have a Hope Mini, and it works excellently. The DH racer in our MTB club uses Hope (4 pot ones, not sure which) and loves them - no probs. One of the other 'extreem' (heh) guys in the club uses them (same as me, the Mini) for DH and trials, and recommended them to me in the first place. In fact, half of the disc brake users in the bloody club use them and _none_ have reported anything but great, hassle free performance. WTF is wrong with _your_ Hopes that's convinced you they are all '****e'? Shaun aRe |
#14
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Disc Brakes...
"Small Black Dog" wrote in message ... I'm looking for a good hydraulic disc brake system. I do pretty aggresive cross country riding, meaning I look for very steep very technical trails to ride both up and down and thow in the moderate connecting trails. I'm curently using the Shimano brakes that came with the 2002 Specialized Enduro, I believe they are the M525 hydraulic disk brakes. The problem is that as the pads wear, the 2 pistons don't move in the same amount so 1 pad will start rubbing and in turn sqeel. They also start to fade a bit after a long steep decent. I'm sure I would like the Shimano XT, or some Hayes equivelent disk brakes but I was wondering if there were some different brands like Grimeca, Hope, or Magura that someone would have some input on. Input on Shimano and Hayes would also be welcome. Thanks for any help on this topic. TJ Simply put, avoid hope like the plague. They look nice but are absolutely ****e. Small Black "i detest my Hope m4 setup" Dog http://www.twistedmonkey.org/images/...8f048aeff7c083 92b12c3.jpg |
#15
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Disc Brakes...
Sounds like they might need a bleed. Do they "pump up" after repeatedly
squeazing ? They've never been soft and have never pumped up - they're tight on the first squeeze. As all this was going on the lever pressure remained consistent - only the friggin bike wasn't stopping! I have never seen a leak and the system has not been opened or otherwise touched. The only think I've ever done was replace the pads. I attributed this to severe fade as they had gotten almost red hot. Stopping and letting them cool helped greatly - but not completely. I'm leaning more towards Chris' theory of contamination - but not sure of the source (I checked the forks - no leaks). The strange thing was it manifested itself at the most inopportune moment. I have another bike which leaked fork oil on the brake pads - the effects of that were quite obvious. |
#16
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Disc Brakes...
Get larger rotors (preferably the XT 8 Inch ones). The larger rotars have
more cooling area and the XT rotors have more cooling holes. Also try an aftermarket disc. Hayes 8 inch DH Purple do a better job of keeping cool. but any steel will heat up eventually and the DH Purple are rather heavy compared to some other discs. Frank "TJ" wrote in message ... I'm looking for a good hydraulic disc brake system. I do pretty aggresive cross country riding, meaning I look for very steep very technical trails to ride both up and down and thow in the moderate connecting trails. I'm curently using the Shimano brakes that came with the 2002 Specialized Enduro, I believe they are the M525 hydraulic disk brakes. The problem is that as the pads wear, the 2 pistons don't move in the same amount so 1 pad will start rubbing and in turn sqeel. They also start to fade a bit after a long steep decent. I'm sure I would like the Shimano XT, or some Hayes equivelent disk brakes but I was wondering if there were some different brands like Grimeca, Hope, or Magura that someone would have some input on. Input on Shimano and Hayes would also be welcome. Thanks for any help on this topic. TJ |
#17
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Disc Brakes...
"D H" wrote in message ... "John Harlow" wrote in message ... I'm not so sure disc are a good idea for long steep descents. I have them (Hayes) and frankly the small rotors don't have enough surface area to dissipate the heat. They burn up while the rim brake riders have no problem. This seems to be the one (infrequent at least in my case ) downside with discs. Once they get superheated they seem to severely loose effectiveness too. You might have marginally better luck with larger (8 inch) rotors. What?! Must be those 'Comp' level brakes. ;^) No problems with my 8in Hayes Mags or 5 1/4" Hope Minis. Wow. Apparently I am the only one to have ever had this happen. But careening down a narrow mountain hillside with a rapidly approaching switchback and a fistfull of brake lever fading to virtual nothingness got my attention. BTW, it wasn't the comps either - it was the stock ones on the Giant. I suspect you have a problem with the setup, or else a defective set of brakes. A friend of mine also wasn't all that happy with his Hayes discs when he got them, but after riding mine just a short way, he knew his setup was not right. I can't remember exactly what was the problem, but bleed issues come to mind as a possibility. Now that he has his PROPERLY set up, he is very happy with them; major turnaround in performance, he said. In my experience, it takes a tremendously serious amount of speed and braking to have any fade problems with Hayes. -- Off to ride the mountains, D H Reply to newsgroup. Spam is out of control. The stock Shimano mechs on my Giant have done nothing but given me trouble. When they work well, they work great. Honestly I think that I get maybe 10% trouble-free use out of them. The other 90% is fading, various adjustment hassles, wear & tear hassles, oil contamination, squealing and expensive pad replacements. The next few hundred spare dollars I have (like that'll ever happen! LOL!) are going towards either a new bike or Hope Mini's. I swear that some days I just don't want to ride because of the sucky brakes. BTW, the pads I've just put on are brand new, on the front and there hasn't been a drop of oil near them - I've already learnt that one the hard way. And if I have to worry THAT much about natural oils from my hands; then discs suck big time. -- Westie |
#18
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Disc Brakes...
On Mon, 7 Jul 2003 11:27:55 -0700, "TJ"
wrote: I'm looking for a good hydraulic disc brake system. I do pretty aggresive cross country riding, meaning I look for very steep very technical trails to ride both up and down and thow in the moderate connecting trails. I'm curently using the Shimano brakes that came with the 2002 Specialized Enduro, I believe they are the M525 hydraulic disk brakes. The problem is that as the pads wear, the 2 pistons don't move in the same amount so 1 pad will start rubbing and in turn sqeel. They also start to fade a bit after a long steep decent. I'm sure I would like the Shimano XT, or some Hayes equivelent disk brakes but I was wondering if there were some different brands like Grimeca, Hope, or Magura that someone would have some input on. Input on Shimano and Hayes would also be welcome. Thanks for any help on this topic. TJ Avid Mechs, Bill The mind serves properly as a window glass rather than as a reflector, that is, the mind should give an immediate view instead of an interpretation of the world. :-] |
#19
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Disc Brakes...
Simply put, avoid hope like the plague. They look nice but are absolutely ****e. Small Black "i detest my Hope m4 setup" Dog I've know many people with hope discs who wish they'd gone with hayes, even shimano. The brakes squeel, the pad-return spring is a piece of bent metal, after a year of hardly heavy use, both brakes are leaking and the performance has never been *Remarkable* I was better off with my Magura HS33s Small Black Dog |
#20
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Disc Brakes...
Small Black Dog wrote in message ... Simply put, avoid hope like the plague. They look nice but are absolutely ****e. Small Black "i detest my Hope m4 setup" Dog I've know many people with hope discs who wish they'd gone with hayes, even shimano. The brakes squeel, Mine? Occasionally, and not very loudly. the pad-return spring is a piece of bent metal, It's a pressed and formed piece of spring steel, and it's only to hold the pads against the pistons, which self retract - it doesn't need to have much force. after a year of hardly heavy use, both brakes are leaking None of the folks I know have had theirs leak. I've had mine for well over a year, and used them quite heavily, in some nasty conditions and had no probs. and the performance has never been *Remarkable* I was better off with my Magura HS33s Mine stop me brilliantly and contollably, all the time, and with little effort on my part. Shaun aRe |
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