6 months ago did a brake change to all 4. did one yesterday and both fronts were at 80% rear left at 40% and rear right at 5%. is there any way to manage pressure? also after my break change my BRAKE light is always on.. thanks guys.

 

abs light maybe. for the other i have no idea. was there any leaks or anything? bled properly ect?

 

Your rear calipers are probably the cause of the issue. They tend to get "stuck". I'm surprised you didn't notice the car pulling to the right a hell of a lot.

Brake light most likely means you don't have enough brake fluid or the floater got stuck.

 

Brake light also means bad sensor on master cylinder.

 

Always readjust your parking brake after doing the rear brakes. This is another reason your brake light may be on.

 

Air in the line that goes to a particular caliper will cause weirdness at that caliper. Under light braking that caliper will not work at all as the air will start to compress and the other calipers will do the braking. Under harder braking that caliper will suddenly grab as air is compressed as much as it can and the fluid start to pressurize at the caliper.

 

Did you lube the guide pins when you changed the pads?

 

If you're losing brake fluid at the same time I'm thinking the bleeder bolt might be slightly open allowing fluid out and less brake wear on that wheel.