Brakes Brake Pads are too thick

Swhitney · May 1, 2021

Here's the parts list:
1992 Mustang Fox
8.8 inch rear end
LMR 11.65" rear rotors here
LMR caliper brackets for 11.65" rear calipers here
Stock length axles (87-93)
caliper brackets to clear the 11.65 inch rotor
stock rear calipers for 94-04

The caliper bracket fits great, the problem is the pads are too thick for the caliper to fit over the bracket. I went to the local auto parts store to compare the cobra and non cobra pads and they seem to be the same thickness. The part number for the pads are SC627A, thru O'Reillys auto parts, and the pads measure around 15.2 mm thick (each).

KRUISR · May 1, 2021

Is caliper piston pushed all the way back? Your pic above looks not fully retracted.

See how flat top of piston is flush with top edge of seal.

Could be rotor thickness that the stock calipers work with (0.545" solid vs 0.71" vented).

Also, when I was looking up some pad thicknesses to help out I noticed there are 16.9mm thick pads and 14.4mm pads. I could not get a definitive answer as to stock vs Cobra for either. Sorry. Check the pads you have, if 16.9mm, maybe you can source some 14.4s.

Mustang5L5 · May 1, 2021

Cobra pads are supposed to be thinner than the GT/V6 pads to allow for clearance with the vented 11.65” rotor. I don’t know the numbers, but there is a difference.

Sounds like you might have the thicker pads, rather than the thinner set you need. I fortunately, this happens from time to time with parts store pads.

Swhitney · May 2, 2021

Mustang5L5 said:
Cobra pads are supposed to be thinner than the GT/V6 pads to allow for clearance with the vented 11.65” rotor. I don’t know the numbers, but there is a difference.

Sounds like you might have the thicker pads, rather than the thinner set you need. I fortunately, this happens from time to time with parts store pads.

I’ve twisted in the brake caliper as far as she’ll go. Also, if possible can someone share a part number for those rear cobra pads? I would also like to know the thickness of the GT and Cobra style.

Mustang5L5 · May 2, 2021

Approx 15mm for Cobra and approx 17mm for GT

OEM part number for cobra pads is

1U2Z-2V200-JA

Motorcraft BR72B

Swhitney · May 2, 2021

Mustang5L5 said:
Approx 15mm for Cobra and approx 17mm for GT

OEM part number for cobra pads is

1U2Z-2V200-JA
Motorcraft BR72B

Damn! Mine are 15 mm thick, just measured. Then my caliper isn’t going in anymore. Maybe I need to swap them out. The calipers never changed between got and cobra, correct?

Mustang5L5 · May 2, 2021

Calipers are the same. Only the pad abutment is different but it won’t matter for your purposes.

you sure the piston is screwed in all the way? From the shot above, it does look to be protruding slightly.

Swhitney · May 2, 2021

Mustang5L5 said:
Calipers are the same. Only the pad abutment is different but it won’t matter for your purposes.

you sure the piston is screwed in all the way? From the shot above, it does look to be protruding slightly.

I spun that thing serval times, and it didn’t in any further. Should I replace them?

Mustang5L5 · May 3, 2021

I doubt both calipers would have this issue. Do you have a pic of them from the side showing the piston so we can take a look?

The rotor should be approx 0.72" (18mm) thick.

Nothing in your pics looks wrong (i have these same brakes), but the pic of the caliper does look like the piston protrudes out a tad too much. Just need a better pic to confirm.

You could always pick up a single parts store caliper to test fit and then return, but before you go out of your way lets see a pic of the piston like Kruisr showed in post #2

Swhitney · May 3, 2021

Mustang5L5 said:
I doubt both calipers would have this issue. Do you have a pic of them from the side showing the piston so we can take a look?

The rotor should be approx 0.72" (18mm) thick.

Nothing in your pics looks wrong (i have these same brakes), but the pic of the caliper does look like the piston protrudes out a tad too much. Just need a better pic to confirm.

You could always pick up a single parts store caliper to test fit and then return, but before you go out of your way lets see a pic of the piston like Kruisr showed in post #2

I resolved just the caliper and it solved the problem for the passenger side.

next problem is how close the caliper bracket is to the rotor. What are your thoughts?

Mustang5L5 · May 3, 2021

Looks about right to me

Swhitney · May 3, 2021

Swhitney said:
I resolved just the caliper and it solved the problem for the passenger side.

next problem is how close the caliper bracket is to the rotor. What are your thoughts?

The driver side is even worse! It’s like it needs a 3mm spacer on both sides.

Mustang5L5 · May 3, 2021

These are offset brackets? If so, they usually include a washer that is used as a spacer. The drivers side looks like it needs one, but pass side looks ok from the pic

Swhitney · May 3, 2021

Mustang5L5 said:
These are offset brackets? If so, they usually include a washer that is used as a spacer. The drivers side looks like it needs one, but pass side looks ok from the pic

These are bracket I got from LMR. According to their install video the washer go directly on the bolt. I can get some 18mm bolts from the hardware store tomorrow to try and space them out. Thoughts?

Mustang Rear Disc Brake Caliper Adapter Brackets For 94-04 Cobra Calipers (79-93)

Install 94-04 Cobra Calipers on your 87-93 Mustang Foxbody with these rear brake adapter brackets!

lmr.com

Mustang5L5 · May 4, 2021

Usually the washers are installed between the pad abutment and the axle flange bracket as a way of centering the caliper over the rotor. This is standard practice in a number of aftermarket brake kits such as Baer. You may not need much to center that, and you don't need to be perfect. Just need to ensure adequate space on each side to account for rotor wobble.

Swhitney · May 4, 2021

Mustang5L5 said:
Usually the washers are installed between the pad abutment and the axle flange bracket as a way of centering the caliper over the rotor. This is standard practice in a number of aftermarket brake kits such as Baer. You may not need much to center that, and you don't need to be perfect. Just need to ensure adequate space on each side to account for rotor wobble.

Thanks for your help, you’ve been a huge help. Had to order some SS brake lines as the banjo bolt was locked in my current rubber brake line.

this rear brake job has been a huge pain in my butt.

limp · May 4, 2021

Swhitney said:
Thanks for your help, you’ve been a huge help. Had to order some SS brake lines as the banjo bolt was locked in my current rubber brake line.

this rear brake job has been a huge pain in my butt.

All good things don't come easy... Plato ( not really)

from6to8 · Oct 20, 2021

Swhitney said:
I resolved just the caliper and it solved the problem for the passenger side.

next problem is how close the caliper bracket is to the rotor. What are your thoughts?

What did you do to get the last bolt to line up? I'm going to double check that the ears of the piston is at the 6 and 12 o clock position as someone stated earlier on the fb group but I don't think thats the issue of that hole not lining up. The piston is all the way in and the caliper clears the pads fine but just don't want to push down another 1/4 inch to get that last bolt in. Someone also mentioned they whacked it slightly with a hammer ( mallet) to I guess maybe weaken the spring some so it would allow you to press down on the caliper more to be able to align the hole. I wouldn't think that's necessary but then again this is only my 2nd time doing breaks and the first on a mustang. My 04 tacoma went smoothly.

KRUISR · Oct 23, 2021

The pads have springs on the top. You will need to push down to get the bolt to line up. It is perfectly normal. Look as post #1, pic 1 and 2

from6to8 · Oct 24, 2021

KRUISR said:
The pads have springs on the top. You will need to push down to get the bolt to line up. It is perfectly normal. Look as post #1, pic 1 and 2

Yes I got it I think the biggest thing was rotating the Piston to 12:00 and 6. After that that allowed the a little bit more clearance and actually still had to whack it a tad with a mallet, but it was much easier and got it lined up

Brakes Brake Pads are too thick

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That is…until I whipped out my Bissell

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That is…until I whipped out my Bissell

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That is…until I whipped out my Bissell

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wrap a little cheese around it and its a done

There's suction so I used that end O_O

There's suction so I used that end O_O

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