I've given my daughter a 93 Lexus SC400 to use and I'm running into a dangerous problem. The Vacuum Lines on the brake system keep popping off when braking. I've reclamped a couple only to find it pop at another spot.
This is a line coming into the booster. I've never heard of this before. Anyone have a idea what could cause this. Any help would be appreciated.
Mike

 

That sounds dangerous, I would get it into a shop before letting her out again.

 

Just replace the lines. Better let dealership handle it. First you get the warranty, second, they will do it right. I am usually anti-dealership guy but in the case of safety, spend cash.

 

Sorry to dig up an old topic, but did you ever find out what the cause was Theresa? Or does anyone else know? I've been starting to have this happen on my 92 SC400 also now.

 

I kinda doubt it. Theresa posted less than two weeks later saying that the car was in an accident:

https://www.clublexus.com/forums/sus...ndow-seat.html

 

maybe the line on the brake booster got hard and then wont hold a good grip anymore?

 

Thansk for the update good2go. k7q, that's a good point, the hose has hardened. I wonder if worn engine mounts are letting the engine rotate extra too and maybe pull the line off.

 

it could be the master cylinder is the problem.