I have an eg coupe. Im having problems with my brake system, cant figure out why my brakes keep locking up. Iv replaced master cylinder, brake booster, calipers, brake hoses, ive bleed them numerous times. It fixes it for a little while but pressure still builds up on the peddle and the brakes lock up after driving for about 2 hours. Any ideas? The only thing left to replace is the dual proportion valve, pads and rotors

 

All wheels lock up or just certain wheels?

 

Just the fronts

 

Could be the pushrod clearance adjustment. There is a special tool, measurements and vacuum gauges involved to get this just right after a booster or master cylinder replacement. I suspect if it's not correct the booster could build up pressure and apply the brakes "for you". It's for this very reason I dread the day I have a master cylinder or booster problem. Might want to just take it to Honda and let them do it.
Tell me the year and specifics of your vehicle and I could attach some of the relevant manual pages.

 

Check that the caliper slide pins are greased and whether the hard brake lines for the front wheels are bent or clogged between the proportioning valve and front wheels.