I have searched around and read up, I have a 92 ls integra, and my pedals starts to sink pretty much right away, depends on the weather, if its colder, it takes a while before it starts to go

my question is this, is it completely on my MC, or can it be my lines??, I am ordering new lines SS ones


I do live in cali weather, so I dont know, I just wanted to know if I really am going to need that MC, and which one should I get??

How hard is it to change out a MC as well

 

this problem has happened to me as well... i noticed my break pedal sinking in during the afternoon time, during more hot weather. my mechanic said i needed a new master cylinder but i couldnt afford one yet so as i kept drivin it.. after about a week it went away.. strange

 

If it were your lines you'd have a fluid leak. Brake fluid on the ground & the fluid level going down in the brake fluid reservoir. If that's not happening it has to be the MC.

After going away by itself, it'll come back, eventually it won't go away. You're going to have to do it someday. Don't wait until your brakes fail on the road.

 

OEM all the way. Many aftermarket MC's are a POS. Physically changing the master cyl. is not that difficult. Just make sure to bench bleed the master before you install it, and bleed all four corners really well once it is installed.