I have a 90 LX 2.3, When I bought it I put new calipers (stock) on it and new pads and shoes on all four corners, I have since swaped the master cylinder with a 93 Cobra MC and used Matt Bobbitt's 2-3port conversion kit. Since then the brakes drag on and off, I went out lastnight and the brakes started draging 2 minutes after I left my house and continued untill I got to where I was going. After letting the car sit for a few hours, The brakes did not drag at all the entire way home! It is normal for them to drag for a bit, then stop and not do it for the rest of the day. Any ideas what could cause this? I have flushed the entire brake system and filled it with DOT3. I am guessing the brake booster but I wanted a second opinion before I spent $110 for the cobra Booster! also when the brakes are acting right the pedal is slightly soft (Normal) but when the brakes are draging the pedal gets really hard!