What did you do to your Fiesta ST today ?

[WolfDampf]

I think hitting the washer with a hammer would defeat the purpose of a washer designed to deform to fit the surfaces of the parts being joined. Instead you'd have a washer conformed to the hammer.

That's my thoughts too, never heard of hammering it

 

[Stubborn Approach]

The banjo is installed with a new washer. You tighten the banjo until the washer feels crushed & wont turn anymore. Tap the banjo head with a hammer & the banjo will tighten a little more, creating a solid seal.

 

[sczamun]

No....

I wasn't aware that was something that needed to be done. I followed this: https://www.fiestastforum.com/threa...eel-braided-brake-hoses-install-review.25513/

If there's a better how-to I'm all ears, this is the first time I've ever done brakes so...

I have doubts that is the case. If you changed the fluid with the correct type and you are confident that you have all the air out of the lines, its probably the master cylinder.