January 8th, 2012, 04:41 PM | #1 |
ninjette.org certified postwhore
Name: dino
Location: Oceanside, Ca
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Why did my rear brake caliper melt?
So I was at the track this weekend. During the warm up orientation laps, it seemed like my engine was lacking power. It was weird, it sounded good but no power. Power was restored about 3-4 laps later, figured it was due to the bike sitting for 2 months. Later in the day I saw this. It don't know what to think...
BTW: The reservoir was still full and I didn't touch the rear brake the whole day.
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January 8th, 2012, 04:55 PM | #2 |
ninjette.org sage
Name: Andy
Location: Sheboygan, WI
Join Date: Dec 2008 Motorcycle(s): 1988 Honda Hawk NT650, 1989 Honda Hawk NT650, 1997 GSXR750 Track Bike Posts: 890
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Are your pistons seized and caused your rear brake to keep pressure on the disc, therefore heating it up and deforming the aluminum caliper?
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January 8th, 2012, 05:00 PM | #3 |
KThanksBye
Name: Kevin
Location: Orange County
Join Date: Mar 2011 Motorcycle(s): 2006 zx636r Posts: A lot.
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Not much help here but on OC moto the same thing happened to someone else, A reason why was never found :/
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January 8th, 2012, 05:00 PM | #4 |
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In the first picture you can see tons of crud on the pistons. I suspect they couldn't move so the pads were stuck.
Wasn't the bike hard to push around before the race?
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January 8th, 2012, 05:05 PM | #5 |
wat
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look at how far the piston is pushed out. the crud was on the inside. your brake fluid in the caliper is probably disgusting. when was the last time you cleaned it out?
but.... why would it keep pushing out... did the fluid boil and put even more pressure on? something had to keep putting pressure in that caliper...
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January 8th, 2012, 05:16 PM | #6 | |
ninjette.org sage
Name: Andy
Location: Sheboygan, WI
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Quote:
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January 8th, 2012, 05:24 PM | #7 | |
ninjette.org certified postwhore
Name: dino
Location: Oceanside, Ca
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Quote:
I'm guessing there was slight pressure on the pads and it just got hotter and hotter until it boiled. Its a no brainer that the caliper is hosed but I'm wondering if a malfunction in the master cylinder could have caused it. I was wrong about the rear brake not being used. It was pressed during tech. I'm probably going to replace the master cylinder just to be safe.
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January 8th, 2012, 05:28 PM | #8 |
wat
Name: wat
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i wonder how much rotational weight the rear brake disk is... it weighs a few pounds right?. . . . . . hmmmmm
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January 8th, 2012, 05:39 PM | #9 |
ninjette.org certified postwhore
Name: dino
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I don't use the rear brake at all ... except when I run off the track into the dirt
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January 8th, 2012, 06:10 PM | #10 | |
ninjette.org member
Name: Jason
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Quote:
The pistons rust in the bore and stick. I'd suspect this is what happened.
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January 8th, 2012, 08:13 PM | #11 |
CVMA #74 WSMC #750
Name: Nemesis
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Too much crud around the piston can cause your pistons to seize and as a result that is what happens.
Any time you change out your tires always spin your wheels and make sure they spin at least one full rotation. If not, you got issues. That's what happened to me on my trackday Nov. @ Buttonwillow. My front wheel wouldn't even spin half a rotation. You can see in this vid Rexbo took where my entry speed was faster but he'd catch me easily in the straights.
Link to original page on YouTube. |
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January 8th, 2012, 08:41 PM | #12 |
CVMA #74 WSMC #750
Name: Nemesis
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Oh Dean I have an extra rear caliper if you need it. LMK>
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January 8th, 2012, 10:33 PM | #13 |
Milkshake Drinker
Name: Skippii
Location: Richmond, Va
Join Date: Aug 2011 Motorcycle(s): 2007 Orange DRZ400-S, 2005 Ninja 250 & Custom Thundercunt Dirt Chopper Posts: A lot.
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Your caliper melted because it got too hot. Glad I could help.
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January 8th, 2012, 10:40 PM | #14 |
ninjette.org certified postwhore
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Thanks for the offer! But I've got a second ninja to pull parts from.
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January 8th, 2012, 10:40 PM | #15 |
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Skippii, where have you been all my life?
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January 8th, 2012, 11:01 PM | #16 |
CVMA #74 WSMC #750
Name: Nemesis
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January 8th, 2012, 11:58 PM | #17 | |
wat
Name: wat
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Quote:
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January 9th, 2012, 12:45 AM | #18 |
CVMA #74 WSMC #750
Name: Nemesis
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