1. Grease on the pads
2. Do the pistons in both calipers move freely? You may need to work them in and out with some brake fluid as lube.
3. Damage to brake hose. This is serious.
4. Different brands of pads used on each side.
You're going to have to get back in there and have a fiddle. It may just be one side is struggling to bed in, but I have never had this problem.
I wouldn't ignore it.
Did you bleed the lines after replacing the pads? You could have air in one of the lines. It will be the opposite side of the direction the car is pulling to. In a liquid/hydraulic system, the fluids will not compress, but if there is the slightest bit of air that entered one side or the other, that air will allow compression. Compression means that the side with air in the line will not press the pads together as well as the other side. It will cause the car to pull to the side without the air in the line.
Maybe you got grease or oil on one of the rotors or pads. If this is the case, it will eventually burn off. Maybe you opened a brake line or bleeder and air got in? If air entered one side, that side won't grip as well as the other. Maybe you didn't grease the slide bolts? A slide bolt getting stuck won't allow the caliper jaw to move freely. Maybe you have a stuck caliper. Were the old pads worn unevenly. That is, were the pads on one side much thinner than the other? If the pads didn't wear evenly, something is stuck... either the caliper piston or slide bolt(s).
If you don't When you changed the pads, were they worn
This also happens when parallel-market (non original) pads are used - due to wider production tolerance, pads may get stuck in certain position.
The only remedy is to reinstall carefully, checking that pads slide within the caliper guides.
If the hydraulic circuit was not opened, bleeding is not required, but it almost always helps. Also, the fluid should be renewed every two years.
Either you have a four wheel alignment issue or one of the front calipers are sticking because no one has ever changed the brake fluid.
if the pull is random, not fixed to a direction, that is complex. if it goes one direction, look for pads that are not right. if they have oil or what ever on them, it will have an effect.
The most likely answer is faulty installation.
Completely bleed all air from system.
Recently just changed the front brake pads now the car drifts either to the left or to the right after I press on the brakes my steering wheel goes right or left.
any ideas why?
these are brand new brake pads.
