So I have a friend with a older integra, he was having some problems with his brakes, he took it somewhere for a free brake inspection, and they said nothing was wrong so after I talked to him I had him bring it over
Air was definitely in the lines, there was lots of nasty red brown gross brake fluid, I did a full flush and bleed on all 4 calipers, replaced the fluid in the entire system. His brakes felt great after this, infact he thought the problem was fixed for about 3 weeks, but they're getting spongy again, I didn't find any leaks, and he's been looking for any drips where he parks but nothing.
So I'm pretty sure it must be a seal in the master cylinder, or brake booster? Probably the master cylinder, right? How do I diagnose this before we start throwing parts at it?
Air was definitely in the lines, there was lots of nasty red brown gross brake fluid, I did a full flush and bleed on all 4 calipers, replaced the fluid in the entire system. His brakes felt great after this, infact he thought the problem was fixed for about 3 weeks, but they're getting spongy again, I didn't find any leaks, and he's been looking for any drips where he parks but nothing.
So I'm pretty sure it must be a seal in the master cylinder, or brake booster? Probably the master cylinder, right? How do I diagnose this before we start throwing parts at it?