Brake bleed screw size 2020 civic?

YoshiMoshi3
Sun, 04 Dec 2022 13:40:25 +0000
Maintenance/Repairs

Hi,

I’m having difficulty bleeding brakes on a 2020 Honda civic EX. I can’t seem to match the bleed screw up to a size. I have the original bleed screws. It seems to be somewhere between a 10 mm and a 11 mm. I have tried several 10 mm box and open end wrenches.

Harbor Freight Pittsburgh 10 mm
Walmart Hyper Tough 10 mm
Lowe’s Kobalt 10 mm
Capri Super Thin 10 mm
Ezarc Aviation Wrench 10 mm

All of which seemed to be to small and I couldn’t get the wrench to fully sit down on the bleeder screw wrench flats. I don’t want to round it out so I stopped. I did have some difficulty getting around the caliper (I didn’t want to disassemble it) and tried a Performance Tool 10 mm bleeder wrench box end that has an offset to get around the caliper, but that also seemed to be to small.

I’ve also tried several 11 mm wrenches and they are way to big. I have also tried 3/8 inch and that didn’t work either.

I can’t find a video on YouTube of someone doing this on the exact car, but have seen like 2016 version and people seem to say its a 10 mm.

At this point I seem to be stuck. It seems like I need a 10.5 mm wrench to slightly unfasten the OEM bleeder screw on this car to do a brake flush. At first I thought it was cheap harbor freight tools with greater tolerances resulting in my issue, but after several 10 mm wrenches it seems to be something in-between a 10 mm and a 11 mm.

Thanks for any help here on this.

77 posts - 22 participants