In most countries there are no limits on how long you can drive without replacing broken or worn components in your RV's braking system... but eventually you will be required by law to do this. Even if you do manage to keep something like an ABS brake system working for years after its safe lifespan (which is very unlikely) this won't protect you against prosecution if anything goes wrong with it at any time! So bear this in mind when deciding how soon you'll need to buy RV replacement parts and always choose a reputable supplier for peace of mind.