Question about 1992 Mercury Grand Marquis

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Brakes Randomly locking up.

I have a `92 Mercury Grand Marquis, 4.6L. (not the police interceptor model).

For the past 2 months, in 5 or 6 different occasions, my front brakes have acted up. Every time, one brake would lock up, either the driver front OR the passenger front. It seems to happen only when an additional load is on the car (luggage and other passengers) or in stop & go traffic, which is understandable.

This is a very weird situation. As I said, one side or the other of the front brakes will lock up, never both. If the car is shut off and allowed to sit for around 30 minutes, the brakes will release and they may not act up again for another day or possible another couple of weeks. I just drove across the country without an issue, but once I arrived on the west coast, it began once again.

They locked up 2 weeks ago and I took the ABS Control Module out to see if my ABS was causing the issue. Apparently, it is NOT, because they started locking up again today.

I did something stupid and decided to drive back home, with the brakes locked up (stopping every few blocks and sitting to let the rotors cool down). Now, when the brake peddle is pressed, it goes straight to the floor, but if i pump the peddle, pressure builds and allows me to stop a little better. This makes me think I blew out the master cylinder seals.

Here's what I know:
The calipers are fine and the piston moves freely.
The slider pins on the calipers are recently greased (white lithium)
The pads, calipers and rotors are 2 years old (20,000 miles)

Could it be the proportioning valve? master cylinder? both? I am so confused and annoyed with this piece of junk. Please HELP! Thanks.

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Hi, sorry to hear about your problem. It sounds like you may have more than one problem. If the peddle goes all the way down to the floor you might have a leak checked the reservoir, or you could have air in the line, if you overheated your brakes bad you might have boiled the fluid also. The brakes locking up could be a stuck caliper. This could be cause by the piston being dirty or rusty and not retrieving like it should. Also if the caliber does not slide freely this could be a problem. Another thing that could be causing your problem most people are not aware of is old brake hoses. When the rubber gets old its swells up and where it goes through the mounting brackets it creates a strangling effect. It's like a check valve under high pressure it goes in but it has a hard time going back. To check for this, when the problem occurs again. Jack up the car and find out which wheel the does not turn, then open the bleed screw or loose the hose. At caliber, if the rotor will turn now. That was your problem. Hopes this helps you.

Posted on Jun 02, 2010

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