brakes locking up on 1997 Chevrolet Lumina

i have a 97 lumina the brakes are not releasing when driveing. i replaced the master and it stll does it if i open the lines it releases them. i called the dealership and they said they never heard of it. can it be the abs mod? pleases help

by in Vernon Rockville, CT on October 27, 2009
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3 answers
ANSWER by , October 27, 2009
Your car has drum brakes rear and disc brake front. There are no relevant technical service bulletins from Chevy regarding this problem. The hand brake has a pivoting arm (on the top of each rear brake shoe each side rear) that could be seizing or binding up, the hand brake cables may not be releasing fully, the wheel cylinders may need to be replaced or rebuilt. The master cylinder may not be allowing brake fluid to return to the master cylinder after brake application. Is the brake fluid clear in color or is it dark and murky, the fluid takes in moisture from the air and causes the fluid to become contaminated and can quite easily cause problems with the brake hydraulic system.
ANSWER by , October 27, 2009
It could be anything from the abs control module to one or more of the calipers. I would take it to a professional to have a thorough diagnosis and repair.
ANSWER by , January 09, 2011
I have the same problems with my 97 fiesta even though I've had both front brake hoses replaced, new servo, new master cylinder and new clutch (the old clutch was worn thanks to the brakes gripping all the time) the mechanic told me the first things to check would be the hoses cos they are the most common cause of the problem, but with mine I've just found out the fluid was filled to the brim and it was murky... gotta be the reason why mine still plays up