Rear brakes

Maxbou92
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19 Jun 2024 13:53 #900987 by Maxbou92

Rear brakes was created by Maxbou92

Hello everyone, my rear brake are stucking when its really hot outside.. even if I don’t touch it !! Rebuilt the caliper, piston move like a new one. But when I bleed the system, it seems like it has always some air in the line?!! The Oem Hose are crimped with some “Plumber” collectors!! My oil level is always at full.. when the caliper stuck, I open the bleeder on it and Im ready to go again !!
thank you for your help

Kz750e 1980

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Moose1800
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19 Jun 2024 14:10 - 19 Jun 2024 14:30 #900990 by Moose1800

Replied by Moose1800 on topic Rear brakes

Sounds like a collapsed brake line to me. When you open the bleeder your releasing the pressure that’s a tell tale sign of a collapsed line.

Last edit: 19 Jun 2024 14:30 by Moose1800.

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Maxbou92
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19 Jun 2024 14:18 #900991 by Maxbou92

Replied by Maxbou92 on topic Rear brakes

Does the air can cause that with the sun heat? A cold night will never collapse my brake .. so weird

Kz750e 1980

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Moose1800
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19 Jun 2024 14:28 - 19 Jun 2024 14:44 #900992 by Moose1800

Replied by Moose1800 on topic Rear brakes

What do you mean plumbers collector, is it an old oem stock brake line?
Let’s see a picture.

Last edit: 19 Jun 2024 14:44 by Moose1800.

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Scirocco
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Never change a running system

19 Jun 2024 14:57 - 19 Jun 2024 15:00 #900995 by Scirocco

Replied by Scirocco on topic Rear brakes

Check the tiny relief port in the MC is not clogged.

Animation made by R.I.P loudhvx, AFIAK

MC normal movment

MC bleeding movement

My 1975 Z 1 B 900 Project

www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode

Last edit: 19 Jun 2024 15:00 by Scirocco.

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Maxbou92
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19 Jun 2024 15:16 #900997 by Maxbou92

Replied by Maxbou92 on topic Rear brakes

Yes its my oem brake system!! Dont looks like new bike with Bolt to master cylinder!! Some clamp to the oil bottle and master cylinder!! Thank you for the picture. I will disassemble the master.. cannot find some pieces for rebuilt rear master cylinder

Kz750e 1980

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Wookie58
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19 Jun 2024 15:26 #900998 by Wookie58

Replied by Wookie58 on topic Rear brakes

I agree with scirocco, I had a KH400 with same issue on the front (crack the nipple and good to go again) the return port in the master was blocked with crud.

1982 KZ1000 Ltd
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca

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Maxbou92
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19 Jun 2024 16:46 #901001 by Maxbou92

Replied by Maxbou92 on topic Rear brakes

Thank youuu I appreciate

Kz750e 1980

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moizeau
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20 Jun 2024 05:18 #901020 by moizeau

Replied by moizeau on topic Rear brakes

I'm another agree. Just had this on my ST on the front. After changing the top hose it wouldn't bleed and very small bubbles came out the feed hole. My suspicions were raised when it was impossible to back bleed. Once the hole was cleaned out it was bled in 5 minutes. I had initially put it down to a collapsing brake line or old fluid.

The following user(s) said Thank You: Maxbou92

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