Q: Bleeder valve not sealing
Bleeder valve screw isn't sealing won't screw in tight
My car has an automatic transmission.
Try and remove the bleeder completely and cleaning the seat and bleeder and see if it works. If this does not work then replace the bleeder. It would’ve been helpful to know which bleeder screw you are referring to, as it could possibly be a brake part or coolant related.
If you’d like a second opinion on this, feel free to contact a certified mechanic, such as one from YourMechanic. They can assess your issue in person and help you fix it accordingly.
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