CRV brake issue
 

I've bought a secondhand 2011 CRV mileage 100,000km. It recent service was at 94,000 a year ago. When I stopped at a traffic light yesterday and pressed the break very tight. However the car slowly skidded backward. I had to release the break for it to advance and avoid hitting the car behind. Is there issue with the break. There is no warning or whatsoever about the car at that time.

Thank you for all your thoughts