Brake Problem
 

I have a 1998 SL2. The brakes work fine until I after I drive like 15 miles then the brake pedal gets hard and the brakes start to lock up on me. I have checked the fluid and that is fine. The hoses to the calipers also seem to be fine. I put new calipers, rotors and pads in the front hoping that would solve the problem but no luck. What should I check next?

Powerbooster?

have you flushed and bled the system?

I have bled the system. I was thinking I should try flushing it next. Ill give that a try. Thanks.

I flushed and bled the system. The brakes worked good for a few days. Now they are hanging up again

Really sounds like you're getting air in the system from somewhere. Did you see any air come out while flushing/bleeding?

I did have some air come out when I flushed them

Hopefully, the re-bleeding of the system will take care of your problem. While you are under there, check for any suspicious indications of leaks or drips from the brake line fittings - they need to be tight