I have a 2011 Hyundai Elantra limited bought it from Stephen wade in st George Utah to me seems like a lemon but I bought it 3 years ago it currently has 114861 miles on it I bought it it only had 95000 I’ve replaced clock springs front brake calipers rotors and pads and I have only replaced the back passenger due to when trying to bleed the brakes using a master cylinder pressure pump not sure what happpened I think the bleeder screw got stripped but start just pushing brake fluid out I’ve replaced clock spring cam shaft sensor crankshaft sensor vvt solenoid and finally the radiator fan and the coolant temp sensor but for the life of my I can’t get pressure back into my brake pedal I fixed the leak I e. Led the brakes done about 15 minutes each caliper don’t see any air bubbles I replaced the master cylinder but the new one did t come with a gasket around d it so I took the old one off and used it I didn’t do your screw driver trick to get the air out of the master cylinder so you think that is my issue
Did you use a bidirectional scan tool to properly bleed the ABS? Most modern cars require it.
@chucktobias I do have an obd scanner it was a 300 Zurich harbor freight brand
On most cars with ABS you can't bleed the brakes without it.
@chucktobias I replaced the master cylinder the other day but the new master cylinder didn’t come with a new seal on the back and the old master cylinder looked pretty clean like there was no leaks so I just reused the seal on the new master cylinder when car is off it feels like it builds pressure but when I go to start the car it goes right back to the floor I’ve tried to bench bleeding felt it use a master cylinder bleeder and a hand pump and an air compressor and I’m at a loss I’ve been struggling with this problem for months now
@chucktobias what does the bi directional scanner do for the bleeding of the brakes I’m sorry if that’s a stupid question
what does the bi directional scanner do for the bleeding of the brakes
It puts the ABS solenoids in the controller into bleeding position and in some cases operates the ABS pump to facilitate bleeding. Without doing that you can't get all the air out of the brake system. I have no idea if your scan tool has this capability but seeing as how you are not familiar with any of this you would need a mechanic do it for you.
Of course it's always possible there is some other defective part. Did you install an OEM master cylinder? Aftermarket parts have a high failure rate, and OEM parts have been known to be bad out of the box as well. However lack of proper bleeding procedure is undoubtedly at least part of the problem you are experiencing.
By the way, while no one here is expecting professional writing please be aware that it is difficult to get through dense blocks of text that have no punctuation or paragraph breaks.
@chucktobias I’m sorry ; grammar was never my strong suit. I did buy an OEM master cylinder. I have it at Burt’s brothers right now. I asked them about using a bi-directional scanner tool to properly bleed the brakes, and they looked at me like I was stupid and said, “I’ve never heard of that before.”
Scotty has talked about using a bidirectional scan tool for bleeding ABS systems on quite a few occasions. Different cars have different requirements though. I've found on my own car that the only time it's needed is if air gets into the ABS module itself (like when replacing a master cylinder). I have not had to do anything special if just replacing calipers, brake lines, or brake hoses where air doesn't get into the ABS module.
In your case there don't seem to be a lot of options for what you're experiencing. Either you have air trapped somewhere in the brake system, you have a defective new master cylinder, or maybe you have a brake hose ballooning out (though I doubt this one).
Also with some cars (like mine) it is possible to manually trigger the ABS pump for bleeding without using a scan tool. The method varies depending on the make, model, and ABS system in use and you have to be careful not to overheat the pump. I don't know if there is a way to do that on the Elantra.
I would immediately question the competence of that shop's mechanics. You need to consider taking your car elsewhere as good brakes are essential for safe driving. When an ABS module gets air trapped in it and you don't have an appropriate scan tool to access/bleed the module, the only remaining method to remove the air from that module is to drive the car around stomping on the brakes activating the ABS module. This is not a 'best practice' as the vast majority of ABS brake systems today are bled using scan tools.asked them about using a bi-directional scanner tool to properly bleed the brakes, and they looked at me like I was stupid and said, “I’ve never heard of that before.”
