entropy
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posted July 27, 2004 12:36 AM
dragging front brakes????
I know this has been covered somewhere but I can't seem to find it.
I have ceramic bearings F and R and they roll forever with pads pushed back, but when i seat the pads i get mucho resistance???? I have tried seating them with many small lever movements but that doesn't seem to help.
no obvious warp/high spots on the disks; pads are about 1/2 worn, but the pads have been dragging somewhat since the bike was new. At one point I put new f pads in, but they dragged worse so i re-installed the old ones.
I'm getting pretty good mph (154-159 on motor depending on track/air), so the dragging pads aren't killing me but like every 1/4 mi addict, i'm looking for every small improvement.
I'd spring for totally new F brakes if i thought that would cure it, but i'm wondering if there is any solution???
Thx for any help that you folk can give!
Karl
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your car is slow
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posted July 27, 2004 04:49 AM
I have heard that if the pistons arent cleaned and still have dust/gunk in them..that they wont return properly on their own and cause the pads to rub on the rotors.
FWIW...they have always rubbed on mine on the front anyway..the rear seems to be just fine.
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TurboBlew
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posted July 27, 2004 04:49 AM
Some easy things to check:
-You can have too much fluid in the master cylinder
-Make sure the caliper piston sides are clean as well as the seals!
Since your bike is a 2000, you may have to experiment with shimming the calipers.
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entropy
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posted July 27, 2004 10:43 AM
I took apart once and cleaned everything carefully, changed the fluid out with Motul.
I don't know about shimming the calipers???
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oldkawboy
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posted July 27, 2004 10:57 AM
You can sand the pads waaaaay down since it's not street ridden.....You don't need no stinking brakes! :-)
Dan
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CrotchRocket
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Bracket Racing with Betsy
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posted July 27, 2004 04:32 PM
You can do what the Pros do, stick a thin flat head screw driver inbetween the rotor and pad and pry them open!!!...After you cross the finish, pump up the brake!!!
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entropy
Moderator
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posted July 28, 2004 04:03 AM
 Edited By: entropy on 28 Jul 2004 05:03
CR,
I would try backing off the pads once as a test; but am looking for a less risky, more permanent soln.
Maybe there isn't a soln, OR, maybe the folks who have figured it out aren't sharing?????? I wouldn't blame 'em, but... 
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your car is slow
Needs a job
Fuck Nitrous...Got Boost?
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posted July 28, 2004 05:11 AM
buy old 90% used pads? this is for dragracing only right?
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entropy
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posted July 28, 2004 09:30 AM
the pads i am using ARE about 80-90% used up, but they rub just as hard as the new ones which I installed then took out because i thought the new, thicker ones were worse. Seems like it doesn't make any difference, old or new.
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Ra12r
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posted July 28, 2004 10:02 AM
I am suspisious that the amount of friction-drag reduces with speed. So by the time you are moving at speed your resistance is minimal.
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your car is slow
Needs a job
Fuck Nitrous...Got Boost?
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posted July 28, 2004 10:25 AM
well...we are talking about tenths of a second here...and with some front tires...even spinning it by hand takes some effort...and its for damn sure UNNECESSARY effort that should be corrected regardless.
Every little bit counts 
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entropy
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posted July 28, 2004 11:53 AM
quote:
well...we are talking about tenths of a second here...and with some front tires...even spinning it by hand takes some effort...and its for damn sure UNNECESSARY effort that should be corrected regardless.
Every little bit counts
Yep!
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entropy
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posted July 28, 2004 11:56 AM
here's some advice from ZX-Alan (the guy who got me into this mania)
Hey Karl, you might should change the o-rings in the caliper...When you do this, take a piece of fine sandpaper, say 400grit, and really wet sand the shit out of the pistons so that you are making them REALLY smooth, slicker then new pistons even.
Then make sure you use brake piston grease on the pistons when reassembling. Also polish the insides of the caliper cylinders when the pistons are out making them VERY smooth also...This should allow the pistons to move in and out VERY smoothly... I would say your pistons are retracting either a little too slow or not quite enough for your type of riding...
Also check the mastercylinder for proper operation...Damn valves in them SOMETIMES don't close bleed off properly and it holds some light pressure on the calipers..
You can also lose one of the calipers/rotors for less rolling weight and less resistance..
BTW, I used to rebuild Brembos for the Brit shit and they are some PICKY bastards...
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your car is slow
Needs a job
Fuck Nitrous...Got Boost?
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posted July 28, 2004 12:10 PM
wonder if you could create a little "spring" or something that would force the pads out off the rotors...obviously it would need to be strong enough to push the pads back...but not stronger than the lever
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CrotchRocket
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Bracket Racing with Betsy
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posted July 29, 2004 06:33 AM
What zx-alan does sounds real good...
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*****DragRacers do it better, because they dont cut Corners*****
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