peter_t Posted January 12, 2016 Report Share Posted January 12, 2016 Hi, i ride an 08 GU Le stock and there is no in built booster so is very flexy. I have been using one of these Echo Urban four bolt http://www.tartybikes.co.uk/4bolt_boosters/echo_urban_4bolt/c3p10604.html It has improved the brake loads but there is still a lot of flex. Maybe close to 5mm? Any reccomendations? Cheers Quote Link to comment Share on other sites More sharing options...
ooo Posted January 12, 2016 Report Share Posted January 12, 2016 Is that 5mm of frame flex? Other than trying another booster (or frame), I'm not sure. The trialtechs are pretty good, I use a carbon one (the newer one) its very good and I have used a 4 bolt before but I can't compare them so not sure which works out stiffer. I think some of my flex is taken by my rim too, so if you have a very tough rim compared to frame it might look more flexy.... ??? Is the rest of the brake setup okay ? does it feel okay to ride ? 2 or 4 finger lever ? Quote Link to comment Share on other sites More sharing options...
peter_t Posted January 12, 2016 Author Report Share Posted January 12, 2016 Yes the brake is set up ok, water bled not long ago, fresh grind and heatsink yellow pads. I have an 05 magura with 2 finger lever. Maybe 5mm if flex was a slight exaggeration but it is still quite noticable by eye. The brake holds ok going forwards but backwards its slips more. Like if i come up short of an edge is slips back. Quote Link to comment Share on other sites More sharing options...
isitafox Posted January 12, 2016 Report Share Posted January 12, 2016 Are you 100% sure it's the frame flexing and not just one pad hitting the rim first and pushing it over? I'm pretty sure you'd struggle to flex most frames that much with a 2 finger blade without really going for it, especially with a 4 bolt booster fitted correctly. Quote Link to comment Share on other sites More sharing options...
peter_t Posted January 12, 2016 Author Report Share Posted January 12, 2016 Ok, just got a tape out and the flex is actually more like 2mm between the bolts with the booster . Is this as good as its going to get or would another booster be better? cheers Quote Link to comment Share on other sites More sharing options...
cwtrials Posted January 12, 2016 Report Share Posted January 12, 2016 (edited) Frame flex can be annoying, but with that setup it might be something different. 2mm really isn't enough to feel horrible at the lever. Does it actually feel bad when riding? Is the brake well bled? A poor bleed can lead to similar results. Pads are hitting square? Finding a super old school boat anchor style 4-bolt booster will be a bit stiffer, albeit extremely heavy. That's what I run, but I have the 4 finger trialtech blades and am fairly heavy. It just doesn't sound like that is what you need Edited January 12, 2016 by cwtrials Quote Link to comment Share on other sites More sharing options...
peter_t Posted January 12, 2016 Author Report Share Posted January 12, 2016 I bled it in a bucket of water, both ways untill nothing came out. Its just the lack of hold backwards which bothers me. Dropping off forwards, gaps etc. it never slips. If i land a pedal up on the edge of a step it doesn't hold that well. This usually makes loads of noise and i slip down. Is this normal and maybe i am just epecting too much? Pads are square although one hits slightly before the other. Would this cause it? Quote Link to comment Share on other sites More sharing options...
isitafox Posted January 12, 2016 Report Share Posted January 12, 2016 The lack of hold won't have anything to do with a bit of flex, that'll be down to the grind and the setup. May be worth going for a longer lever blade to give you a bit more leverage and power. Quote Link to comment Share on other sites More sharing options...
peter_t Posted January 12, 2016 Author Report Share Posted January 12, 2016 Ok thanks for the replys. Will try a harsher grind and new lever. Quote Link to comment Share on other sites More sharing options...
cwtrials Posted January 12, 2016 Report Share Posted January 12, 2016 Whats your rim and pad setup? Quote Link to comment Share on other sites More sharing options...
isitafox Posted January 12, 2016 Report Share Posted January 12, 2016 13 minutes ago, peter_t said: Ok thanks for the replys. Will try a harsher grind and new lever. Doesn't necessarily have to be harsher! Quote Link to comment Share on other sites More sharing options...
ooo Posted January 12, 2016 Report Share Posted January 12, 2016 yeah what isitafox said, 2mm of flex is normal and should affect the brake. But if you weigh a normal amount the brake shouldn't slip under any condition except coming up short of a corner, theres just too much leverage there. If it is slipping otherwise then thats a problem. IMO Heatsink yellows are great pads for summer, but they don't work well in the winter or in the wet, TNN ADMs work real good when wet. Quote Link to comment Share on other sites More sharing options...
Mikee Posted January 12, 2016 Report Share Posted January 12, 2016 I would advise against a longer lever for now. The brake should be perfectly adaquete with a 2 finger lever. The problem is somewhere else. If it were me, I would take the brake off, double check the bleed and check slosely for leaks . Make sure the pads and rim are really clean. And then set it up, making sure it is perfectly square. Give it a little bit of time to bed in and see if it has improved. Quote Link to comment Share on other sites More sharing options...
peter_t Posted January 12, 2016 Author Report Share Posted January 12, 2016 3 hours ago, cwtrials said: Whats your rim and pad setup? oldschool tryall round hole rims and heatsink yellows on cnc backings. 3 hours ago, isitafox said: Doesn't necessarily have to be harsher! No? Quote Link to comment Share on other sites More sharing options...
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