Installing new pads should be done with care and consideration. Cleanliness is critical. Spray or wipe down the entire system with commercially available brake cleaner, and be sure you keep any other chemicals—including brake fluid—off the pads and discs. Take your time and inspect every part of the braking system: caliper bodies, discs, mounting hardware, and each of the lines from the master cylinder all the way to the caliper. You’re looking for cracks, leaks, and evidence of damage, either from physical contact or heat.