Author Topic: dragging front brakes  (Read 4214 times)

Offline Marid2apterbilt

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dragging front brakes
« on: December 11, 2011, 08:07:52 pm »
It seems my front calipers on the 929 are dragging more than I think they should. If I remove the calipers the wheel gets about 2+ full turns before stopping and no noise from the bearings in the wheel, Wheel bearings w/ wheel off feel to be rolling smooth also.

W/ the brake calipers installed the wheel only rotates about 1/2 turn when spun by hand.  Everything seems to be working OK though. Good lever feel, Recently bled as they were spongy when I bought the bike. I have pressed the pistons in/out several times.
Pads look to be wearing evenly also..

Anyone got any ideas
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Offline r6boater

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Re: dragging front brakes
« Reply #1 on: December 11, 2011, 08:39:47 pm »
It sounds like the pins that hold the pads in place may not be letting them slide properly.

Offline Trav-A$$

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Re: dragging front brakes
« Reply #2 on: December 11, 2011, 09:16:12 pm »
Slight bend in a rotor? You would feel it when on the brakes if that was the cause.
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Offline Marid2apterbilt

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Re: dragging front brakes
« Reply #3 on: December 11, 2011, 09:24:36 pm »
brakes do not pulsate like a typical warped rotor, I dont have a working dial guage to really check nut they look and seem strait, No changes in drag when I turn it by hand.  Brakes were pretty smooth last time I rode it.  They do tend to fade on spirited run on the hill.

Im leaning toward caliper piston replacement but hope its something else,  My thought is there not fully releasing.

R6Boater, That may be the case, Will have to wait till im home again to tear into them again, Although I doubt that would be the case as the pins arent that tight a fit to the mount holes in the pads..
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Offline Curtie223

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Re: Re: dragging front brakes
« Reply #4 on: December 12, 2011, 08:22:19 am »
What pads are you running? I notice that when I switch to ebc hh's they tend to do that. Also keep in mind that the pads never fully go off the rotor. So this will create a drag vs the brakes off the wheel

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Offline 8Ball

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Re: dragging front brakes
« Reply #5 on: December 12, 2011, 04:35:34 pm »
+1 to Curtie, HH's will do that for about 500 miles or so....or a few Gap days. ;)
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Offline Marid2apterbilt

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Re: dragging front brakes
« Reply #6 on: December 12, 2011, 10:31:24 pm »
Not sure on pad type, I have some NEW HH pads to go on, Just not installed yet. My VFR has some drag but not this bad, As do most/all disc brake applications. You should IMHO get atleast or close to a full rotation out of them.
1 thing i should have done but didnt was check the drag w/ 1 caliper on/off etc.  Im surely not done diagnosing them,  Im never satisfied till I find the actual cause, Not one to just throw parts at something till it works, I wanna why and how :34

gonna order new lines soon,  Ever heard of Russell (brand name) brake lines.  Got a qoute from a friends shop in DE. front and custom rear for Around $100.00
I dont like the idea of compression fittings etc though.  I would much preferr OEM type hydraulic presssed fittings, or factory type fittings.  Brake failure due to a line coming apart just doesnt sound very healthy.
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Offline Curtie223

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Re: Re: dragging front brakes
« Reply #7 on: December 13, 2011, 08:18:22 am »
Never heard of them. But is the front duals or the crossover lines? I thought I was getting a killer deal on my Galfer front lines and when I got them I realized they were the crossovers. :(

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Offline Marid2apterbilt

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Re: dragging front brakes
« Reply #8 on: December 13, 2011, 07:36:27 pm »
looking around I found coremoto.com

Dual fronts and custom length rear +3" for $154 shipped.  Havent pulled the trigger yet but I like there website etc.
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Offline Marid2apterbilt

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Re: dragging front brakes
« Reply #9 on: December 13, 2011, 09:00:54 pm »
Just ordered the brake lines.   Found a coupon code for $10 off (bk10)

total w/ shipping $145 = Dual line front and +2" rear from Coremoto.com


I willl let you know what I think of them later, Otherwise unless you hear of me having a brake failure then Well, You know..  :34
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Offline 8Ball

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Re: dragging front brakes
« Reply #10 on: December 13, 2011, 11:46:03 pm »
Russell are OK, they have been doing SS lines for a long time.  They used to be some the best ones out, but now they are upper mid-range.   The last set I used, the banjo fittings threaded into the lines.  I never had an issue, but I prefer hydraulic crimp, as well.

The set I got for my R6 is HEL, which are supposed to be very good in Europe.  I bought them on Ebay from the UK for about $100, front and rear.  I'm pretty happy with them.
The kit for yours (same ebay seller) looks like it's only the front lines:
  http://www.ebay.com/itm/Honda-CBR-929-HEL-FRONT-stainless-steel-braided-brake-lines-CBR929RR-CBR929-RR-/330656949279?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item4cfcb0a41f

Also, I've heard that older Galfer fittings had rust issues...not sure how long ago that was, but something to keep in mind if buying used.
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Offline Marid2apterbilt

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Re: dragging front brakes
« Reply #11 on: December 14, 2011, 01:11:52 pm »
Since I have new lines on the way how about sprucing up the calipers.

There is some discoloring etc, I assume oxidation of some sort on the caliper pistons. Has anyone ever tried to clean them up with 0000 steel wool as long as the boots n seals look good and reinstall the pistons ?
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Fine dont eat my CUPCAKES then

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Re: dragging front brakes
« Reply #12 on: December 18, 2011, 09:18:37 pm »
here is an idea that needs to happen... loosen up the caliper bolts.  loosen them to wehre they are 2-3 turns from tight.  then pull the front brake lever, or have someone else do it for you. then tighten the caliper bolts.. this lets the calipers align to the rotor via the brake pressure.. where as if you dont do that, they just kinda align where they are could be off to one side or not, and then tightened down... found on my rr, with the ebc hh pads, they tend to drag a touch.  the rr has NO slop and accutally has a slot that the calipers go in that keep them located same place EVERYtime.  kinda sucked, but, what i mentioned works on ALL other bikes..

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Re: dragging front brakes
« Reply #13 on: December 18, 2011, 09:20:57 pm »
o and russell brake lines/fittings are damn good stuff.. HUGE in racing.. almost as big as the other

Offline Marid2apterbilt

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Re: dragging front brakes
« Reply #14 on: December 19, 2011, 01:16:55 am »
brake lines from coremoto.com arrived yesterday.

I will try that Drop n let you know.  I was tired when I was messing with them so I shortcutted alot of things I usually do.  I was kinda high off the paint n glue fumes too..

I usually let the lever center the pads/pistons, Whenever I remove them I push them all the way in then after replacement it takes a few draws on the lever to get the feeling back in them.  Not sure if these are floating calipers or not, I will check them out and lube the slide pins if they are.  I have found that most people neglect to do that on the disk brakes of there cars.  Thart usually causes 1 pad to wear faster than the other though.

I kinda like the whiz/whirl sound the EBC HH pads make when applied. :34

So much to do, I wish I was home more :(  Gotta make $ to pay the bills n for the toys right..
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Offline Curtie223

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Re: Re: dragging front brakes
« Reply #15 on: December 19, 2011, 04:16:17 am »
:lol
That a pretty great deal. If you like them then I will get a set for the z

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Offline Marid2apterbilt

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Re: dragging front brakes
« Reply #16 on: December 19, 2011, 07:22:53 am »
As for russel and other brands, I didny really like the ideal of compression fittings or extra adapters,  Wanted something like an OEM fitting where the shanks is PERMANANTLY installed.   Simpler and less places for possible failure.

Curt I really didnt look around much, There may be better deals out there. I liked there website, About us info, and they made it easy to order with the +1, +2, +3", etc options.  w/ there extra options you can really up the price if you like w/ black fitting, etc.

I will say that there order production and shipping seems top notch.  Shipped same day w/ Usps, pkging is a box inside a shipping envelope.

I wont be able to get my eyes n hands on them till next week though, Work sucks.. :34
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Offline Curtie223

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Re: dragging front brakes
« Reply #17 on: December 23, 2011, 08:28:30 am »
kenny had a great Idea with the Pins. Maybe you need to lube them up. They may even be causing the pads to stick a bit?

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Offline Marid2apterbilt

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Re: dragging front brakes
« Reply #18 on: December 24, 2011, 08:25:25 am »
put the new lines on last nite,  Then tore the front calipers apart and removed the pistons. Cleaned them up and put back together.''

Also installed the EBC HH pads I had on the shelf.

They feel alot better at the lever and not dragging as bad.

Still need to take it out and break the pads in though.
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Offline Marid2apterbilt

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Re: dragging front brakes
« Reply #19 on: January 09, 2012, 08:48:05 am »
update.

Took the 929 out on 12-31-11.

WHAT AN IMPROVEMENT !!!!!

It will put you on your nose without much effort at all now.

the front wheel gives me almost a full rotation when I spin it which seems about normal.
The lever feels solid with just a hair of slop.
2 fingers will lift the rear wheel.  I might even have to start wearing a cup or put some sticky on the seat :34

If your bike has some age on it or not, Bleed those brakes.
If its still a little soft...
Disassemble the calipers and give a good cleaning to remove the hard baked on buildup of brake dust.
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Offline Marid2apterbilt

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Re: dragging front brakes
« Reply #20 on: January 09, 2012, 08:55:54 am »
:lol
That a pretty great deal. If you like them then I will get a set for the z

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I would reccomend these.  Install was easy, came with all new banjo bolts and crush washers. Dual front lines, One line for each side strait off the master to caliper. They are smaller OD than the OEM and come with rubber mounts already on the lines so they may be a little loose in the OEM hold down guides.

The custom length rear line was perfect. 

Very smooth n clean look also, There coated unlike the typical steel braided lines.
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Offline Marid2apterbilt

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Re: dragging front brakes
« Reply #21 on: March 23, 2012, 11:30:04 pm »
ok first good warm day to actually get out n play and my TWITCH in the bars is still there just not as noticable, Brakes seem to be GREAT but the twitch is only when I apply them suddenly or release them while in a curve.  Also it reacts differently depending on left or right turn.

"Trail Braking" in a left it feels as if the bars just get stiff/tight and unresponsive till I release the brakes, Yes w/ a knee on the ground.

Right handers I get a twitch to the left w/ the bars when brakes are released.

This is not happening at a leisure pace, Only when at a moderate or higher pace (3x posted corner speed) and only when Im still setting my corner speed going INTO the corner then release brakes completely at or near apex.  Only when brakes are released.

If I grab a quick hand full then release once suspension compresses it will twitch to the right, Yes, This is in a strait line. Twitch = Visibly watch the Bars, Clapms, Wheel, forks etc give about a 16th inch little jerk.

I would really like to figure out what this is before I start tearing things apart or throwing parts at it.

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