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I am shocked what happened to the piston rubber seals! The seals on the new kit from AliExpress enlarged and deformed! This is why the return of the lever was so slow, and this is why the lever was sinking to the end without enough brake power.
But, what happened to these seals?! I used dot4 fluid, I have rebuild brake pump enough times to know how to do it. Repair kit may be of bad quality. The original (old) kit lasted 15 years with no problem or rebuild! The new one lasted 10 days?!
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