Rear brake issue - locked up after first ride - Kawasaki Forum :: KawasakiWorld.com
 
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post #1 of 8 Old 04-07-2019, 10:09 AM Thread Starter
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Rear brake issue - locked up after first ride

Thanks in advance for the sleuthing on this. On my first ride after purchasing, the rear brakes went away after i used a couple times. Got home and realized the rear caliper was destroyed, with the pistons coming out of the bores and grinding away at the disk. I picked up a used caliper, cleaned her up and polished up the pistons, installing a nice used disk and a set of HHH sintered pads. Bled the rear braking system before my second ride today.

Rode about 5 miles, breaking in the rear pads. They felt great. However, I felt the bike laboring when I was about 1/4 mile from the house, so I slowed to a stop. The rear brake caliper was clamped down hard, the rear brake pedal almost in a locked (down) position. I was able to release a little tension on the rear caliper/disk and limped home.

What's odd is when I let the bike sit for 15 minutes, the rear brake pedal begin operating like it should, and the rear caliper is no longer clamped down on the disk.

Could the rear master cylinder be the culprit? Do I need to rebuild it? What you you guys recommend? Thanks much.

2000 ZX12R (A1) with 14k (Candy Persimmon Red)

Last edited by 71Rcode; 04-07-2019 at 11:28 AM.
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post #2 of 8 Old 04-07-2019, 12:20 PM
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Is the rear foot brake lever pivot free, it may need stripping and cleaning.

For Tech Questions Bike Model letters and Country are more useful than saying the year, for UK owners anyway, as registration year is not always the year of manufacturer model.
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post #3 of 8 Old 04-08-2019, 06:30 AM
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That or the piston needs cleaned up..

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post #4 of 8 Old 04-08-2019, 06:51 AM
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I would go for a full strip down . Had to do my fronts as they were seased up when I bought it .
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post #5 of 8 Old 04-09-2019, 03:16 PM Thread Starter
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Hey thanks guys for all the recommendations. I got the master cylinder and the rear caliper kits coming and will rebuild them this weekend. I can't afford to eat another rear caliper and disc too much downtime!I'll report back soon.

2000 ZX12R (A1) with 14k (Candy Persimmon Red)
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post #6 of 8 Old 04-09-2019, 06:01 PM Thread Starter
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Few pix of the first brake failure
Attached Images
File Type: jpg 20190316_212936 (768x1024).jpg (393.7 KB, 4 views)
File Type: jpg 20190316_213005 (768x1024).jpg (372.7 KB, 4 views)
File Type: jpg 20190316_212710 (768x1024).jpg (381.1 KB, 4 views)
File Type: jpg 20190317_071832 (768x1024).jpg (384.5 KB, 4 views)

2000 ZX12R (A1) with 14k (Candy Persimmon Red)
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post #7 of 8 Old 04-09-2019, 06:10 PM Thread Starter
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After reworking - and prior to the rear caliper locking up a second time. Now it's time to disassemble the rear caliper again and master cylinder and rebuild them both, and also checking the lube on rear brake pedal pivot.
Attached Images
File Type: jpg 20190324_145255 (768x1024).jpg (409.1 KB, 3 views)
File Type: jpg 20190324_145248 (768x1024).jpg (457.5 KB, 3 views)
File Type: jpg 20190324_145310 (1024x768).jpg (492.3 KB, 3 views)
File Type: jpg 20190324_145347 (768x1024).jpg (449.2 KB, 3 views)

2000 ZX12R (A1) with 14k (Candy Persimmon Red)
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post #8 of 8 Old 04-21-2019, 04:40 PM Thread Starter
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Just to close this thread for anyone who finds it. I found the issue which was a clogged return port in the master cylinder that wasn't allowing fluid to return to the master cylinder. To get to this, remove the 90 degree plastic pipe from the master cylinder by removing the circlip holding in place. I used a .010 high E guitar string to clean out the port along with brake cleaner and a toothbrush and compressed air. Good as new.

2000 ZX12R (A1) with 14k (Candy Persimmon Red)
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