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#4104606 - 04/09/21 08:02 PM Rear brakes locked up. - NEED HELP!
markf1971 Offline

Registered: 04/08/21
Posts: 2
Loc: Alabama
I have a 1992 Ford Crown Victoria that has rear disc brakes.  This vehicle is a spare one that we use occasionally.  I had driven it about 30 miles and as I was parking it at the house.  I put it in reverse to back it where I wanted to park it, when it started to barely move when I was backing it.  I realized that the rear brakes were locking up.  When I removed the rear wheels to check out the problem I didn't see any obvious problem.  Given the age of the car I thought it was a good idea to replace all the hydraulics and the pads.  The rotors looked OK so I didn't replace them.  I installed a new brake hose, remanufactured caliper, and new pads on both rear wheels.  So, I thought my rear brake problems would be gone for good.  I moved the car to a different spot in the yard and everything went OK.

The next time I was going to use the car I drove it to the gas station for fuel and to clean the windshield.  I barely made the one mile trip back to the house as the rear brakes had locked up again.  I thought that the car might have a center, rear brake line that was collapsing inside the hose and keeping hydraulic pressure from being released from the rear corners.  But..... when I got under the car to look for a center, rear brake line I found none.  The left, rear brake hose has an inlet and an outlet on the end opposite the caliper, which receives the brake line coming from the front of the car and also an outlet which provides fluid to the brake line that runs from the left, rear corner to the right, rear corner.  So, basically I'm explaining that the left, rear brake hose serves the function that the center, rear one would for a vehicle that has three rear brake hoses.

I looked online to see if this car has a proportioning valve that may be the problem, but I couldn't find one.  I didn't really think that the master cylinder could cause such a problem, but maybe I'm wrong.  If the master cylinder was the problem shouldn't it make the front brakes lock up as well?

Has anyone ever experienced anything like this or have any suggestions on how I should proceed to diagnose the problem?  I would prefer to diagnose it instead of just throwing a master cylinder at it to see if that corrects the problem.  Any help would be appreciated.

#4104616 - 04/09/21 10:23 PM Re: Rear brakes locked up. - NEED HELP! [Re: markf1971]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 2165
Loc: Cleveland, OH
Did you look at the parking brake (inside the rotor)?

1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 55K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.
1988 CVLX (Destroyer) 1998-2001 driven to death 202K
1988 Squire (Chris Craft) 1996-1998 junkyard rescue driven to death 199K

#4104620 - 04/09/21 10:44 PM Re: Rear brakes locked up. - NEED HELP! [Re: markf1971]
CrystalPistol Offline

Over the Hill

Registered: 10/16/01
Posts: 3246
Loc: Shenandoah Valley
Rusty parking brake cables will do that too, raise it up and if you release the parking brake and can NOT turn a wheel at all (try both sides) ... then with parking brake still released, grab the cables and wiggle vigorously. If it releases, you can find a way to lube them or replace the offending units.
Problems huh? Then Read THE Book. Signed: A natural borne "neanderthal".
________________________________________ ____________________
Toreador Red 2001 Mercury Grand Marquis .... with some minor mods. joy
I've been hated before. cool2 I still am by some maybe? shrug ... I got over it. cool

#4104622 - 04/10/21 12:02 AM Re: Rear brakes locked up. - NEED HELP! [Re: markf1971]
RF_Overlord Online   content


Registered: 12/14/02
Posts: 7506
Loc: MA
^^^what they said^^^

The parking brake on these cars is a majorly stupid a mini drum brake. If not used regularly it can seize up and even have friction material delamination.

Unfortunately, the parking brakes are best serviced with the axle shafts removed, unless you have a lot of determination and a way-higher tolerance for frustration than I do.
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

#4104658 - 04/10/21 12:41 PM Re: Rear brakes locked up. - NEED HELP! [Re: markf1971]
markf1971 Offline

Registered: 04/08/21
Posts: 2
Loc: Alabama
I can't remember what the parking brakes looked like. I'll have to check them out, especially the cable. Thanks!


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