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Post by secabox on Jul 29, 2018 10:44:29 GMT 1
Hi to the forum.I have converted my 250 lc with twin disks.I have rebuild the calipers with new and nos parts.including pads pins pistons seals all nos.The problem is the pads rub on the disks and still hot without pull the brake lever.
I testet in the center stand and on the rod the same problem. Before I converted with the single disk I have no problems.
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Post by dusty350 on Jul 29, 2018 10:52:43 GMT 1
Hi
What about the discs ? Perfectly flat or maybe warped ? Are they bolted evenly to the wheel face ? If wheel has been painted or coated without being masked properly the disc may not be flat against it.
Dusty
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Post by secabox on Jul 29, 2018 10:58:55 GMT 1
Hi What about the discs ? Perfectly flat or maybe warped ? Are they bolted evenly to the wheel face ? If wheel has been painted or coated without being masked properly the disc may not be flat against it. Dusty Hi disks are flat and clean on a workshop. The wheel never painted all factory original. I noticed the upper part from caliper this with the pin it's very hard to move in and out. Cheers nick |
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Post by dusty350 on Jul 29, 2018 11:02:16 GMT 1
Did you lube the pin at all ?
Dusty
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Post by secabox on Jul 29, 2018 16:02:10 GMT 1
Did you lube the pin at all ? Dusty Yes I doo it's a mystery |
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Post by reedpete on Jul 29, 2018 17:21:21 GMT 1
Just lube isn’t enough. If you are renovating them the pins need to be scrubbed and the bore needs to be scrubbed too. Both corrode really easily and then it stops the calliper floating. Can also be caused if you have no free play on the adjuster. Once they heat up and the fluid expands they can get stuck on.
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Post by rich on Jul 29, 2018 17:52:43 GMT 1
Master cylinder have enough play at the adjuster screw? Is the return hole blocked?
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Post by Monochrome on Jul 29, 2018 19:33:16 GMT 1
Mine used to corrode under the shims, enough to lift the shims and jam the caliper.
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Post by looey on Jul 29, 2018 19:42:15 GMT 1
As Rich says, the tiny master cylinder return hole often causes problems. Once you've applied the brakes, if the return hole is blocked, the fluid can't return, so the caliper pistons can't moved back fully. The brakes then bind slightly, then heat starts to build up, and the situation exacerbates  Well worth checking, which you can normally do with the master cylinder lid off when applying the brakes on and off (just watch out for the fluid squirting up and out of it if it's clear lol) |
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Post by donkeychomp on Jul 29, 2018 23:53:49 GMT 1
Are you using the correct caliper bolts? Not got YPVS ones in there as they will rub on the disc.
Alex
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Post by secabox on Jul 30, 2018 12:27:34 GMT 1
Are you using the correct caliper bolts? Not got YPVS ones in there as they will rub on the disc. Alex Master cylinder ,hoses ,bolts , Pins,pads all new and original I have striped and painted the callipers. |
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Post by donkeychomp on Jul 31, 2018 22:11:35 GMT 1
Wheel a bit wonky? Is everything bolted down properly? Have you got some pics?
Alex
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Post by secabox on Aug 2, 2018 17:05:45 GMT 1
Wheel a bit wonky? Is everything bolted down properly? Have you got some pics? Alex YES Alin please. Before I beginning with the calipers rebuild I disassemble the fork legs to chänge the seals.I put it again the forks on the bike and aftwr the calpers it's possible to have some to with this.Not in the right position the forks? I don't think so because the wheel axle go on the wheel without issues. |
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Post by bezzer on Aug 3, 2018 11:14:44 GMT 1
If you have removed the forks to rebuild previously, have you routed the flexible brake hoses correctly on refitting?.
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Post by secabox on Aug 3, 2018 20:03:46 GMT 1
If you have removed the forks to rebuild previously, have you routed the flexible brake hoses correctly on refitting?. Yes the hoses are corect installed |
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Post by donkeychomp on Aug 3, 2018 21:55:45 GMT 1
Put a picture up and things might be a damn sight easier!  Alex |
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Post by rapidgaz on Aug 4, 2018 7:18:27 GMT 1
How about the spacers in the front wheel. Could they also be incorrect.
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Post by secabox on Aug 4, 2018 7:34:52 GMT 1
Put a picture up and things might be a damn sight easier! Alex I will try to upload some pics |
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Post by secabox on Aug 5, 2018 21:26:50 GMT 1
Put a picture up and things might be a damn sight easier! Alex I will try to upload some pics I have try to upload pictures within flicker but not possible. I have a theory with the brakes.when I rebuild the calipers I have sending the retainers for Chrom Nikel and i see its more thik now.maybe this is the problem why the pin don't have free play to return the half of the caliper bracket. Have someone measurement the thiknes of the retainers? 😂😂 |
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Post by secabox on Aug 5, 2018 21:29:12 GMT 1
I will try to upload some pics I have try to upload pictures within flicker but not possible. I have a theory with the brakes.when I rebuild the calipers I have sending the retainers for Chrom Nikel and i see its more thik now.maybe this is the problem why the pin don't have free play to return the half of the caliper bracket. Have someone measurement the thiknes of the retainers? or where I can find retainers? Thanks for your help 😂😂 |
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