How do you remove bra wire from Bosch serie 4 washing machine

remove the agitator ( top loader) and check for bra wires, coins or buttons

Please check this link for a visual indication.
Click on : Removing for bearing replacement

it completely has to be pulled apart and once you have done that you will probably find the bra wire while spinning around has ripped into the plastic outer tank so bad it will now leak and have to be replaced & this is the most expensive job to have done it sounds silly for a bra wire but you should honestly consider buying a new machine it often ends up cheaper to do so rather than spending 3/4's of the price of a new one fixing your one.

You could try pulling the bra carefully out, and try rotating the dum both ways at same time.
I dont think removing the rubber seel will help, but if you want to try, I think that is held on by a wire and strong spring, try a blunt screwdriver,or spoon handles, so as not to damage the rubber, and leaver it off, to replace, use some soap, "fairy liquid type" to help wire slip over the rubber lip!
(In future put bras into small bags, for socks, just a thought)

possibility of such a bra wire stuck in the drain valve or drain hose, you can check, ranging from filter sewage water to the drain valve (with drain motor). you should open the drain valve / motor assembly. wire bra might clog there. so that the rubber water valve does not close properly

possible causes are:

bra wire stuck in tub and rubs against the drum and squeals when on spin.

lip seal at front of bearings squealing - this is a difficult repair

no drain then no spin
check filter and check for foreign objects jamming the pump impellor - usually bits of bra wire

Sounds like a bra disintegrated and plugged the drain pump. Last time I had this happen, I had to take the machine apart, then the outlet pump and manually remove the clothing item. Most likely a service call for you.

This video will show you how to get into the drum through the heating element and remove the bra wire on this Bosch front loader washing machine
we have all bosch repairs in our channel

Switch off machine and unplug it from the wall socket. Remove back plate and identify the heating element. It should be located at the bottom of the outer drum. Remove element and you will have limited access to the space between the drums. Rotate the drum slowly by hand untill the bra wire gets to the bottom of the drum. Remove obstruction with hook or long tweeser.