I have a 90 Buick Century with an integrated master cylinder/proprotioning valve assembly. All 4 brake lines go to the side of the master cylinder. The system is split diagonally. Just replaced the master cylinder and observed the following. If I run either of the front caliper pistons all the way back on one side of the car and step on the brakes, the petal goes to the floor while the piston is being pumped back out to clamp tight to the rotor. Well this seems like the master cylinder does not have a backup(secondary) feature. I would have thought that this was a defective section in the master cylinder, but it works exactly the same after I have run either passinger or driver front piston back into the caliper. I also ran the caliper piston back in to the caliper, put the wheel on and drove down the driveway at about 10 mph. Upon applying the brakes the car did stop slowly, with petal to the floor. I am not sure how well it would have been at 50mph if a brake line blew out? Anyone with experience in this area have thoughts as to this issue? thanks
- posted
18 years ago