a lot of brake jam if park too long... like mine... i spare a mallet hammer in my trunk. when it jam i need it to knock, knock a bit and hopefully the spring release.in the real world, to be honest, on a car used to go from a-b drums do the job. 99% on the road theres little to no benefit of having disks all round? correct me if im wrong? stoping distances are pretty much same? unless you go up and down genting and rely on the brakes that much.