Handbrake problem on Honda Jazz?

The handbrake on a 2005 Honda Jazz is acting strange.

Whenever I am at biting point with the handbrake fully in place, the car will start to move forward regardless of the action of the handbrake.

Also when the car is on an incline of any kind the handbrake is very weak and will not hold the car in order for me to get to the bite and make progress. At times this can be very scary especially when there is a lot of traffic behind.

I don't know why this is happening or what it could be but the car has about 90,000 miles on the clock.

Any ideas?

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