Lexs400

I'm trying to figure out why there is almost a 2 second lag in the brake effect of the 93LS400.
As an example, If i jam the brakes at moderate speeds, it almost takes 2 to 3 seconds of full pressure before something in the system kicks in and applies full force of the brakes and then the car has the full brakes applied with a rapid jerk. The rapid application is OK but it should happen the moment the brakes are jammed. Not after the lag period.
Once however, the brakes are jammed and ABS kicks in, from there on forward for about an hour or so the brake response does not have any lag in it.
Leave the car over night or drive without slamming the brakes and it goes back to the non-responsive, no crisp 3 second lag braking situaiton.
the car has traction. DOes this sound like a bad Master Cylinder or should I be looking at a different component ?
any ideas would be appreciated.

phillipin

I would start by checking your brake fluid level, and maybe having it replaced. When it does brake does it pull to one side at all?

Lexs400

The brake fluid has been flushed about 2 months ago. and the bleeding has been done several times so air in the system shouldn't be causing this either..
any other ideas... keep them coming

Lexs400

anyone else care to share their input ?

phillipin

check all your vaccum lines, if everything is good, and youve bled it, and the fluid is new then its gotta be the brake master going out, or the valve sticking

gowest

Is that one way valve went bad?

Lexs400

All else was done and interestingly enough the master cylinder was replaced last year. but could be that it was a bad one that was installed.
what valve did you mention when you mentioned it being sticking ?