I've bled my brakes several times now and I'm certain I've done it perfectly this last time, but...on my first time bleeding, I have this feeling I let the reservoir get a bit too low. Could that explain why I cant get the firmness in the brakes, despite bleeding each line, in sequence, perfectly? Is this a situation where one needs to bench bleed the brake master cylinder?

Car Details: 2000 Hyundai Accent, no ABS

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Yes you need to pull your master cylinder(MC) and bench bleed it. Air in your brake lines can be removed by a normal bleed of pushing the brake pad and keeping the MC filled above the min line. But once air gets in the MC it cant get out of the MC by that push on the brake pad method. You need to find the workshop manual for your specific car for instructions to be sure you did it right, but generic bench bleed may be ok. Several good companies offer very inexpensive 1 yr or 5 yr subscriptions online. Auto zone who operates Alldata, has much of its paid subscription information on its site for free! You just need to sign up with your email and you'll have access to a ton of procedures, specs and pictures for near most cars on the road.

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    Don, thanks for confirming my thinking and thanks for the tip on Autozone's procedure data and specs. I'm definitely going to try bench bleeding, starting with a generic bench bleed and go from there. – Mark Witmer Nov 28 '19 at 23:20

It's quite possible that if you've let it get too low, air has got back into the system - in which case I think the only option is to start again...

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  • To clarify, I've actually started over many times now and I'm sure I bled the lines correctly. The question has to do with bench bleeding the master cylinder. Could bleeding the lines have no affect on air trapped there? Can air get trapped there if the reservoir gets too low? Is this a scenario I need to bench bleed the BMC? Hopefully that makes sense. – Mark Witmer Nov 28 '19 at 16:20

I don't know the year, make, model or brake system type. But if you have air in the antilock system you could try bleeding the pump. This requires a scan tool with that capability. If you don't have access to a scan tool , you could try bench bleed and hope it works. It seems like you are bleeding correctly, so if there are no leaks, it is most likely the pump or master cylinder.

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  • I should've added my cars details to the question. I'm going to do that now. It's a 2000 hyundai accent (no ABS in this case). Thanks for the response! – Mark Witmer Nov 28 '19 at 23:12

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