Loss of brake pedal: This condition is usually a result of brake fluid leakage due to failure of a brake hose or a rusted metal brake line, a worn wheel cylinder or brake caliper, or a worn master cylinder. A simple once over of the system will reveal what's going on.
If you have questions about a specific purchase, it would be best to speak to an attorney who could inform you of your legal options. While there are laws that allow for a 3-day right to cancel certain purchases, these laws are very specific and do not apply in a majority of consumer purchases.
For example, if you have decided that you do not want to sell your home, then the broker will almost always agree to cancel the contract. There is no point for the real estate agent to spent time and money promoting your home if you are not fully committed to selling. However, if you are simply not satisfied with the agent's services, then she may not be as eager to break the contract.