How to flush brake fluid
#51
Reviving a super old thread here, but I think this exactly has happened to me. I was flushing my brakes and kept getting air bubbles coming out. I kept refilling the reservoir, and bleeding, and filling, and bleeding, and I kept getting bubbles. The only thing I can conclude is that there’s air seeping in through the bleeder screw threads, but I’ve never heard of this anywhere else before. Can anyone confirm this is a real thing?
You are correct, air does enter via the bleed screw threads but is difficult to isolate the problem. There are bleed screws around mostly used for motorbikes which can overcome this problem as they have NRV's internally and soft sealed threads. The only other option is to wind some PTFE plumbing tape around the bleed nipple threads first before screwing them back into the caliper. You will lose some brake fluid doing this option though and it's messy.
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