Fiesta Brake Problem

[Overhandzeus]

Hi all, the wife has a 2011 fiesta Zetec and lately its developed a somewhat intermittent brake issue, when you apply the brakes it's as if you have to apply a certain amount of pressure then suddenly it's as if the resistance isn't as much so suddenly it brakes sharper, I think the best way to describe it is let's say when you first apply the brake the resistance in the pedal on a 1-10 is say a 5 then when you get so far down it becomes a 3 so where you are gradually applying the brakes it suddenly brakes sharper and you can noticeably feel it in the pedal, any ideas?

[gillyallan]

To me, as a non mechanic, I was thinking air in brakes. Needing bled or fluid changed.

[Overhandzeus]

I thought that myself but as air is compressible I expected a more spongy feeling than resistance at first

[gillyallan]

Oh yeah. Actually reverse of what was thinking.

[DieselPig]

Sounds like grabby brakes, bit of pressure not much happens then wham you hit a brick wall?

When was the last time the brake fluid was changed?

[Overhandzeus]

Yeah I suppose, it's as if suddenly you feel the pressure dissipate hence you suddenly brake harder and I don't know when it was changed as we got it in Oct last year, I'll start by changing it and go from there thanks

[potter18]

Could be brake servo