Review on 🔘 Power Stop K1990 Front Z23 Carbon Fiber Brake Pads with Drilled and Slotted Brake Rotors Kit by Drew Springer

Installed a few months ago. The quality of the product seems very good, but after installation I have intermittent brake pulsing. Since the pulsation is intermittent, it may not be due to the rotors, but I now assume it is. Ripple aside, they appear to be pretty good rotors and pads. Update July 2014: The ripple continued to deteriorate to the point where it became unacceptable. Called Revain and they sent a new replacement under warranty in June, almost a year after the original purchase (amazing customer service!). Passed the break-in procedure up to the letter "T" both this time and the first install. At first the problem was solved and everything was fine, but after a few weeks the pulsing returned. The pulsation only starts after a few stops and seems to be related to the rotors heating up, they are silky smooth for the first few stops, then the pulsation gets worse as you drive to the point where it looks like something is happening. wobble when braking! There is absolutely no pulsing until you press the brake pedal, so it's definitely brake related. At first I thought it could be the ABS system, pulled the ABS fuse and it's still pulsing. Then I thought that this could be due to the brake disc overheating from stuck calipers or possibly a pinched brake hose. Brake caliper and hoses changed, problem remained! I will consult Power Stop again and then go to the local parts store to buy new rotors and pads. At the moment we leave a 3 star rating, if necessary we will update it later.