If you are replacing disc brake pads, then a disc brake spreader is a very useful tool. Spreaders push the caliper pistons back into the caliper with damaging the rotor or caliper. Depending on the design of the brakes on your car there are several different types of spreaders. This article covers how they work, and the different types available.
Loctite Threadlocker, or thread sealer is one of those items that every do it yourself mechanic should have in their tool chest. Loctite makes three different types of threadlocker depending on the application. Each is a different color which can help you identify the type of threadlocker to be used when replacing nuts and bolts.