Rear Brake Master Cylinder Plunger Seal - Kawasaki KFX450 Forum :: KFX450HQ.com
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post #1 of 3 (permalink) Old 11-06-2018, 08:09 PM Thread Starter
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Rear Brake Master Cylinder Plunger Seal

So I purchased an aftermarket rear brake master cylinder (left in picture) because my factory one (right in picture) started leaking. Once I got the new one in as you can see it doesn’t seem to be sealed like the factory on on the bottom of the plunger. For the life of me I cannot get that boot to stay on that nuts lip. I can get the boot up on it and get it 100% sealed but as soon as I put pressure on it (as if I was braking) it just comes right back off. Any ideas or has anyone had this problem before? Rear Brake Master Cylinder Plunger Seal-img_1408.jpgRear Brake Master Cylinder Plunger Seal-img_1409.jpg


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post #2 of 3 (permalink) Old 11-11-2018, 02:24 PM
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So I purchased an aftermarket rear brake master cylinder (left in picture) because my factory one (right in picture) started leaking. Once I got the new one in as you can see it doesn’t seem to be sealed like the factory on on the bottom of the plunger. For the life of me I cannot get that boot to stay on that nuts lip. I can get the boot up on it and get it 100% sealed but as soon as I put pressure on it (as if I was braking) it just comes right back off. Any ideas or has anyone had this problem before? Attachment 24136Attachment 24138


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Can you zip tie or wire tie around the boot to keep it in place...???

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post #3 of 3 (permalink) Old 11-11-2018, 02:35 PM Thread Starter
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Originally Posted by TechDrift View Post
So I purchased an aftermarket rear brake master cylinder (left in picture) because my factory one (right in picture) started leaking. Once I got the new one in as you can see it doesn’t seem to be sealed like the factory on on the bottom of the plunger. For the life of me I cannot get that boot to stay on that nuts lip. I can get the boot up on it and get it 100% sealed but as soon as I put pressure on it (as if I was braking) it just comes right back off. Any ideas or has anyone had this problem before? Attachment 24136Attachment 24138





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Can you zip tie or wire tie around the boot to keep it in place...???


I ended up just using a mixture of silicone and super glue. Seems to be okay but we’ll see how it holds up against brake fluid, mud and anything else when we get on the trails.


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