pinging maxpower

hey Glen, 2003 Grand caravan. friend has one with front brakes bad.....wife driven so who knows....lol anyway 44,000 mi, fried pads, rotor, broke the
piston in the left front caliper. he was told the piston doesn't come separate.....so he changed out the entire caliper. pedal goes to floor obviously until bled but he bled it 12 ways to Sunday, still went to the floor and has no more time to work on it, so took it to the dealer.
Now they attempted to bleed the entire system, and got the same results. They attempted to order a master cyl. but got a red flag asking for call to tech. After they called and stated what was going on, the guy at tech said.......let me guess, the left front caliper was replaced, wasn't it? after telling him yes, he proceeded to tell the dealership person that there's an issue with the 2003's. if you get air in the system, it destroys the hydraulic assist unit and it must be replaced. So they ordered it, and told my friend they would have it done tomorrow. He called me tonight and asked if I had heard of a hydraulic assist module. I hadn't, but not turning wrench full time anymore, so there's lots of new stuff out there I'm unfamiliar with. he states 900.00 including labor to replace it and turn the rotors.
any ideas what this unit is they are replacing for him ?
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into the left caliper all the time and replacement of the hydraulic assembly was the fix. But you say a brake job was done and the calipers were replaced, there would be no need to replace the hydraulic assembly for that reason.....it was not letting air get into the caliper......the person that installed them got air in it, there fore why would the hydraulic assembly need replacing???? The system needs to be bled with the scan tool that is the only way I have had any luck with removing air from that system. someone better call the Chrysler star center back up and talk to a different tech and tell them that the air was not in the system until the caliper was replaced, and I bet you get a different answer......and that would be to not replace the hydraulic unit.
good luck
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his words were "the bled it electronically" so that led me to believe they used the scan tool. Still I'll let him know. he said they were to replace it today, and now his wife is IMing me and stating they replaced it, and turned the rotors, and now feel the master cyl is out ( still doing the same thing) which is what he felt was the issue all along......
Thanks glen, I passed it along. thank god the guy knows alot about cars.......he's already all over them on this one!

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Well if there was no air in the system before it was worked on and now there is, I would say it didnt need those parts, However, depending on the milage of the vehicle, the technician that was bleeding the brakes after the repair may have had the seal inside the master cylinder rip, which would cause the pedal to go to the floor and the brake lite out. Me personnaly, it didnt need the hydraulic assembly
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yeah their more he and I discussed it the more it sounded like master cyl. he had the right idea from the get -go it sounds like.

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Rob, send me an e mail address and I will give you the procedures to bleed the hydraulic assembly
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nspctrguy at gmail dot com

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heres what he tells me now........"Well, after replacing the hydraulic boost, they got pressure back in the system. Then the brake light came on and stayed on. So another call to tech and they were informed that the switch in the master cylinder tripped, and there is no way to reset it other than replace the master cylinder. The service rep said he is going to try to get the mastercylinder done for me as a freebie, since I'm already taking it up the shorts for 900.00."
good lord I'm glad I don't live there!

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