Driving the 3 door today, car just been put back on the road after 5years. Had tarox 10 pots up front, fresh brake fluid and brakes were working fine. Gave the car some today and had to brake hard and all of a sudden i had a very soft brake pedal and hardly any stopping power.

Crawled the car home, left it for a bit and gone back to it and the peddle appears to be back to normal again.????

Any ideas

Dont want to be using it with this issue as could end up causing an accident.