Your original post stated that the brake pedal got hard. After everything was replaced, it was fine for a day, and then it got hard again. By the time you got back to the shop, the brake was soft again. Right?
One of two possibilities:
1. Collapsing brake hoses, as you said. They must have seen the brake hoses as they were replacing the calipers. I am surprised they didn't tell you to replace the hoses, if they are bad.
2. Improper bleeding. You did say that you replaced the master cylinder, ABS module and calipers. Rotors are not a part of the hydraulic system, rather the mechanical part. Brake bleeding for ABS-equipped vehicle is different than the conventional brake bleeding. A Tech 1 scan tool or equivalent is required to properly bleed ABS-equipped vehicles. You may want to ask them how they did the bleeding. If they said nothing about hooking up a scan tool into the ABS system (especially when ABS module was replaced), then they didn't bleed your system right.
Monday, March 2nd, 2009 AT 12:36 AM