Problem with the front brakes locking and overheating

Yesterday I replaced my front brake pads and rotors and bled the front brake lines. When I went to give it a test run, I popped it in gear and it sat there, as if still in park. Hit the gas a little, and felt that the front passenger wheel was locked up. I took everything off the front passenger again to make sure I installed everything properly the first time--looks like I did. After putting everything back on, the same thing happened. Today I replaced the front passenger caliper, thinking maybe the old brake pads were so worn down that the first caliper's pistons were shot. After installing the new one, the same thing happens. Any ideas? Thanks.

I own a quick lube and performed an oil change on the above vehicle last Spring. Within a couple of hours, the customer called back saying he had a problem - his Jeep would not move. We sent a lube tech to check it out. He found that his brakes had locked up on one wheel. We told the customer the problem was not related to our oil change service and he called a tow truck and took it to a repair shop, which said his brake fluid was contaminated with some petroleum as the master cylinder seal was swollen and deformed. He also said this same repair shop had redone his brakes a year earlier because of a similiar problem.
He believes we added oil or power steering fluid to the brake fluid reservoir. We responded that we never ever add anything to brake fluid reservoirs. We only check the fluid level by looking through the translucent side of the reservoir. We never take the lid off unless the reservoir is NOT translucent, which is rare. Also, we informed the customer that we have NO brake fluid in our facility, so we can't even add any if it is low. We also informed the customer that IF we had accidentally added something to his reservoir, there would not have been enough time since he left our shop for the fluid to have badly deformed his reservoir seal and caused a brake to lock up. He doesn't believe us and is sueing us in small claims court for the $1,100 he paid to have his brake system replaced AGAIN.

Do you concur that even if we had added a petroluem product to his reservoir by accident, that the damage he says was caused could not have happened in less than a day? If so, why OR If not, why do you feel the way you do? Also, what causes a brake to lock up and how long does it take to happen? Any thoughts as to what caused his problem?

The Jeep had the following repair done for $1100: remove and replace the master cylinder, both front calipers and both front brake hoses. Our quick lube had only serviced the Jeep once before and that was 21 months and 30,000 miles earlier. I know that petroleum in the brake fluid will cause the seals to swell, but even that couldn't occur significantly in two hours or less, could it? Also, what conditiion or conditions are likely to cause a brake to "lock up" or drag? If I understand you correctily, any contamination in the master cylinder reservoir would be confined to that area only for some period of time, presumably far longer than a couple of hours. Actually, I think our customer called us within 30 minutes or 1 hour. A final question: Are you ASE certified in brake repair?

Front left caliper keeps on sticking. I've replace rotors pads top dollar pads caliper twice brake line from caliper and finally brake equalizer

It need brakes, so went to collapse, both calipers would not copress, so iput in new pads rotors and calipers, test drove it they would buildup and bindup after 20 mins of driving, so figured bad rubber lines. So replaced them, nope still building and binding after a test drive, only way to release the pressure to drive it is to crack the bleeders Cant figure it out please help me

I do not think I have abs no sensors on braking system, and if they are not contaminated what next?

I have a XJ cherokee I have renewed the front disc pads, the rear wheel cyls and shoes have been renewed about 14 weeks ago, the problem I have is under more than average braking, the rear brakes lock up, under normal braking it seems the front are not working as they should be. Can some one help with some info, Thank you.
Ash824903