Calipers, Rotors, Pads, Lines & more- OEM and Aftermarket
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By BLaCkSiLo
#160080 hey guys, so i have an integra rear disc swap on my 94 EJ1 and have been running it successfully for about a year now, i got a 15/16" BB/MC combo, the 4040 prop valve and the trailing arms.

Yesterday i was out in the backroads fooling around and i hit my brakes "pretty" hard to come to a stop before hitting gravel. they worked just fine like they should have. I drive home and notice that my brake pedal felt a little different but didn't think much so i parked for the night and drove it today and the pedal almost sinks to the floor if applied slowly. i thought i needed to bleed them from when i changed the calipers so i go to check today and the fluid is spewing out of the little rubber "plug" diaphragm thing in the middle there. if you push the brakes and watch it, it gushes out, went through the whole reservoir in 1 day.

here is what i mean:
Image

and here is a pic with out the plug:
Image

does anyone know what this is for and why it blew? do i need a new valve or is something else the matter....maybe brake pedal adjustment?

Thanks for anything,
James