Stopped at traffic lights today and while having my foot on the brake pedal it suddenly went soft for a few seconds and my foot sank then hard again (yes I am talking about the brake pedal lol)

I have the red brake light lit on the instrument panel but thought this was due to condensation shorting in circuit board out (common in 03 focus models)

I have checked the break fluid and it hasn't dropped at all. Discs and Pads are well within limits too.

Anyone know what this could be?

When was the brake fluid last changed ?

When was the brake fluid last changed ?

Would love to be able to answer that but not since I have had the car (3 months) the oil was changed in 2007 but only done 3k since so hoping then but not sure.

I have just changed the engine oil at the start of the week.

Would old brake fluid cause the light on the dash too?

Brake fluid is hydroscopic - meaning it will absorb moisture over time - which lowers the boiling point - which can result in spongey brakes & reduced braking efficiency.

I'd change the brake fluid first as it's the cheapest & easiest potential fix & doing that will also give you peace of mind & then see if the warning light stays on or goes off after the fluid change

A picture of the warning light would be good

This is the warning light I have:

Sometimes it goes out for a few minutes, sometimes the ABS light flashes too but not very often!

when were the brakes (discs and pads) changed? I had a similar problem with my abs lite turned out to be dirty connections on abs wire going to sensor so cleaned them all up and changed discs and pads and I haven't had any problems since