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View Full Version : Funky Brakes on GMQ LSE



Bradley G
03-10-2006, 05:21 AM
The 2002 Grand Marquis has exhibited a hard pull to the right(braking).
This occurs only in the rain, and only if, you have not used the brakes for a while.
It only pulls for a few/ couple seconds.
The front Brake linings are new, the rotors were just turned 6k ago.
The rears have never been serviced @ 55K(still has origonal keep washers on hub)
My theory;
somehow the brake rotor (left) side gets excessively wet, (bent backer plate?)

anyone ever had this issue ?
The faster I correct this, the faster I get back to driving the Marauder. :D

Zack
03-10-2006, 06:18 AM
Sounds normal to me.
Rain does wierd things to brakes.

Bradley G
03-10-2006, 12:35 PM
One of the Techs at work claimed, if the rotors were different thickness, the thicker rotor grabs first, I'm sure it is exaggerated by the rain.
He said to switch them and see if it still occurs(other side).
I'll Probably just replace them.

BK_GrandMarquis
03-10-2006, 04:08 PM
This seems like a common problem. There has been a few posts over the months about Panthers pulling.

Here is a recent one on the CrownVic forum.
http://www.crownvic.net/ubbthreads/showflat.php?Cat=&Board=UBB23&Number=1060107&page=8&view=collapsed&sb=5&o=&fpart=1

Zack
03-10-2006, 04:17 PM
One of the Techs at work claimed, if the rotors were different thickness, the thicker rotor grabs first, I'm sure it is exaggerated by the rain.
He said to switch them and see if it still occurs(other side).
I'll Probably just replace them.

That tech should be fired.
Does he know how a caliper works?

Blackened300a
03-10-2006, 04:46 PM
That tech should be fired.
Does he know how a caliper works?

If the rotor is thicker on the one side, wouldn't the side with the thinner rotor have more travel?
Wouldnt the more travel cause a slight delay in the pressure to the rotor which would then cause the car to pull due to the thicker rotor already under pressure??

Replace the rotors and move on.

RR|Suki
03-10-2006, 06:12 PM
If the rotor is thicker on the one side, wouldn't the side with the thinner rotor have more travel?
Wouldnt the more travel cause a slight delay in the pressure to the rotor which would then cause the car to pull due to the thicker rotor already under pressure??

Replace the rotors and move on.
no beacause the thinner one doesn't mean the caliper is further from it, remember it;s the moving rotor that makes the caliper back off when you go... so in theory the caliper will always be just off the rotor... no matter how thick

RF Overlord
03-10-2006, 06:25 PM
RR|Suki is right...so is Zack.

Bradley G
03-10-2006, 09:02 PM
Many on CV.net have claimed exactly the same symptoms.
No one has any ideas?
Some pull left, some right.
One instance, All new pads and new rotors; same issue.
Looks like I won't be driving the MM for a while, :alone: especially if it rains!

JimmyXR7
03-12-2006, 10:10 AM
Is your car sitting outside?
The brake rotors on the north side of your car can be exposed to more moisture than on the other side.
The steel on the rotor can rust slightly while sitting.
The pads can pick up some of the rust and change the braking
characteristics.
Also check for the normal stuff.
rotor scorings,
bent water deflector,
dirt or grease on pads.
If it continues and the rotors look smooth, I would change the pads first.
Jim

RR|Suki
03-12-2006, 12:58 PM
could it be an air bubble in the line, right in the middle or something moving from one side to the other...

Bradley G
03-13-2006, 05:12 AM
The car sits outside next to the other panther.
The one that has no brake issue.:D
The rotors are smooth, as they were turned about 6K ago.
the linings were also changed.
Is your car sitting outside?
The brake rotors on the north side of your car can be exposed to more moisture than on the other side.
The steel on the rotor can rust slightly while sitting.
The pads can pick up some of the rust and change the braking
characteristics.
Also check for the normal stuff.
rotor scorings,
bent water deflector,
dirt or grease on pads.
If it continues and the rotors look smooth, I would change the pads first.
Jim

wchain
03-13-2006, 03:22 PM
The MM has a completely different frame/suspension setup, its also newer. Perhaps aftermarket rotors are causing this?

petesmarauder
03-13-2006, 04:50 PM
Replace pads with oem. This was a pad composition problem. Also have alignment checked, a small caster or camber split can have a multipling effect of a brake pull. I think it has to do with suspension dynamics and tire composition.

wchain
03-14-2006, 08:24 AM
How could Non OE Pads cause that problem? There have been millions of CVs that are NOT running OE pads as replacements. Obviously Ford Motor Company doesn't tool up to produce brake pads, someone has to make them for Ford. Used to be Bendix. I run wagner thermoquiets on everything, including my MM which is running on COMMAND Cryo Rotors, and I have NO pulling issues at all.......

Bradley G
03-30-2006, 05:23 PM
I noticed the rotors were glazed, one worse than the other.
I did a few high speed panic stops, 90-0.
On the third one, the brakes were smoking.
I drove the car in the rain and had no pulling what so ever!

Tallboy
03-30-2006, 05:29 PM
[Bugs Bunny]...[Whispering]..."Gremlins!"

Only logical explanation.

SergntMac
03-30-2006, 05:30 PM
So...Problem fixed, eh?

bugsys03
03-30-2006, 05:35 PM
Is your car sitting outside?
The brake rotors on the north side of your car can be exposed to more moisture than on the other side.
Jim

WOW!!:lol:

Bradley G
03-31-2006, 09:30 PM
Yes sir!
Kinda feeling silly, for not trying this first.
But the rotors were turned within about six thousand miles ago.

So...Problem fixed, eh?