Post by: beemuker on January 25, 2018, 09:07:09 AM
Post by: Chaos on January 25, 2018, 09:22:46 AM
Post by: The Mighty Gryphon on January 25, 2018, 09:53:59 AM
I don't know if it really makes any difference, but using a good used disc will have both discs more uniform in hardness, thickness, stopping power, and, yes, appearance.
As long as it isn't warped or thinner than spec, I would have no problem installing a used disc. I use organic kevlar pads so disc wear is minimal. This allows me to use discs that are near to the service limit in thickness and still get acceptable longevity out of them.
Post by: Martin on January 25, 2018, 10:47:45 AM
Regards Martin.
Post by: Chaos on January 25, 2018, 10:48:32 AM
Post by: beemuker on January 25, 2018, 11:26:27 AM
I have successfully straightened warped discs. We are talking minor warping not major buckles. If you don't have patience and restraint read no further and get another disc. :nono Be warned it is a slow process requiring lot's and lot's patience and a delicate touch, and only works on solid rotors not floating ones. Set the bike up so the front wheel is off the ground. You need to remove the calipers and attach a dial gauge indicator (DGI) with whatever you can rig up solidly to the top caliper retaining bolt. It needs to be set up so it runs on the outer most edge of the disc, and can be rotated away from the disc when adjusting the warp. This will only work if the disc has a smooth track to run on, if it doesn't forget it. With the DGI set up to run on this track rotate the disc a determine where the warp is and how big it is and mark with a pencil this part will be repeated after each adjustment. To remove the warp you will need a piece of broom handle 10" - 12" long and a plastic hammer. The next bit requires patience and a delicate touch. Rotate the DGI so it is clear of the disc and place the end of the broom handle on the outer most edge of the disc carrier (not on the disc) where you marked the position of the warp, and tap gently with the plastic hammer. If the warp is bulging out from the centre you need to tap it in. If it is bulging in need to tap it out. When tapping it out, the broom handle will be running at an angle this is the reason for it's length. You need to realign the DGI after every tap and check that you have moved it and by how much. Under no circumstances belt it or hit it hard, you will eventually get a feel as to how hard to tap it believe me it won't be a lot. Hitting it hard will only push it too far and will require you to tap it back the other way. You need to avoid tapping it to and fro, this will happen occasionally but needs to be reduced to the minimum. You are aiming for a figure under .007", well under this can be achieved with patience.Patience and restraint were in short supply when I was being incubated, so I think I may take my chances with a used one. But I'll go have a look at it again and see if I can measure how far it's out.
Regards Martin.
Post by: Martin on January 25, 2018, 11:37:51 AM
Regards Martin.
Post by: Laitch on January 25, 2018, 11:48:29 AM
My front brakes pulse and I have determined my left front rotor is slightly warped.How did you determine that?
Post by: Filmcamera on January 25, 2018, 11:51:13 AM
Post by: beemuker on January 26, 2018, 12:37:12 PM
How did you determine that?I held a stationary object [screwdriver] close to rotors and rotated the wheel.
Post by: Laitch on January 26, 2018, 02:41:54 PM
I held a stationary object [screwdriver] close to rotors and rotated the wheel.You hold it with your teeth or clamped in a toolbox? :giggles
Post by: Martin on January 26, 2018, 02:53:06 PM
Regards Martin.
BMW rotor alignment tool.jpg (60.89 kB . 768x576 - viewed 296 times)
Post by: rbm on January 26, 2018, 03:19:53 PM
Post by: Martin on January 26, 2018, 03:54:29 PM
Regards Martin.
Post by: beemuker on January 26, 2018, 06:14:12 PM
(https://catholicstudentleadership.files.wordpress.com/2013/12/time-on-my-hands.jpg)
Post by: Laitch on January 26, 2018, 06:24:27 PM
you guys have way too much time on your handsWelcome to the club!