Replacing seals in brake master cylinder

How easy is it to replace the seals in the master cylinder. My brakes get really soft after driving in the heat for a while. Feels a lot like a seal is going bad. I've never worked with the master cylinder before.

before blaming the master cylinder check to see if it could be a bad wheel cylinder maybe its leaking brake fluid [assuming ur back brakes are drumbrakes] and check too see if on ur front brakes if the caliper is leaking could just be air in the lines because of that or maybe it could be ur brake lines i would check all those things before assuming the master cylinder is the culprit

or maybe some how air got in the line from lack of brake fluid and all u have to do is bleed the brakes

good luck with that

Whoops, forgot to mention that I've put all new brake pads and rotors on the front, and completely flushed the whole system with all new brake fluid and bleed the lines. Still getting soft. Also, there aren't any leaks, I've checked the level of the brake fluid and it hasn't changed in weeks.

Just get a remanfactured MC, they are only like $40.

Its not really that hard to do, but I would suggest jsut going with a remaned unit like mentioned above, alot easyer.

Is there a good place online to get a remanufatured mastercylinder? Also, if I'm buying the whole thing might as well upgrade to the Integra MS, which years/models will fit the 4Dr EX model. Thanks

Yeah I Would Just Buy A New One I Had A Similar Problem And I Just Went To The Local Auto Parts And Baught A New One.