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Unread 11-03-2009, 07:37 PM   #1
Mean Max
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Front disc brake rotors & caliper fitment

While at Bennett Auto Supply today I took some pictures & collected some brake information that may help avoid any confusion when it comes time to purchase brake parts for your YJ.

Here are the different YJ brake rotors & calipers available for YJs, including the year break information.

Here is a front brake rotor for '87-'89 YJs. Notice that it's a solid rotor & the "hat" measurement is just shy of 3 inches. They are the same left to right.



Here are the calipers for the '87-'89 YJs that use the rotor listed above.
FR4181 = Passenger side caliper
FR4182 = Driver side caliper
Notice that the brake line fitting is located to the side of the piston, facing the axle shaft.



Here is a front brake rotor for '90-'95 YJs. Notice that it's a ventilated rotor & the "hat" measurement exceeds 3 inches. They are the same left to right.



Here are the calipers for the '90-'95 YJs that use the rotor listed above.
FR4339 = Passenger side caliper
FR4340 = Driver side caliper
Notice that the brake line fitting is located facing the top of the piston, facing inward toward the frame.




With regard to purchasing calipers, you may be asked if you want "calipers only" or "semi-loaded" or "fully-loaded" at the time of purchase. Here is what that means.
Calipers only = Usually just the calipers with a bleeder screw & not much if anything else
Semi-loaded = Usually includes mounting pins, anti-rattle clips, bleeder screw, and copper sealing rings for the brake line fitting
Fully-loaded = Includes all of the above, and brake pads.

Max

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Unread 11-03-2009, 07:41 PM   #2
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Whats with all the holes in the first one Max?
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Unread 11-03-2009, 07:46 PM   #3
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I really don't know Jim. I have seen them like that in the past, but never with any apparent reason for the holes.

Good question!

Anybody know?

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Unread 11-03-2009, 07:50 PM   #4
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Well Max I guess if you dont vent the rotor you might as well vent the hat!
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Unread 11-04-2009, 08:27 AM   #5
YJake
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Mine don't have any extra holes anywhere

I also believe that I still have the stock rotors

Good info Max!
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Unread 06-19-2010, 03:01 PM   #6
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I need to expand on this info, sorry Max, good thread tho'.

I have an '88 Wrangler stock axle from my six banger with 3:55's.
Next to it I have a '95 Wrangler stock axle from a four banger with 4:11's.
I intended to buy new rotors and loaded calipers with pads for the '95 axle before I put it back in.
I called the local AutoZone and the guy on the phone was pretty knowledgeable about brakes.
He brought up all the part numbers and they are totally different as you stated.
However, my '88 is different than the pics you posted above about the '87-'89.

First, the brake caliper bracket is different. On the ''95 it's molded to the carrier, and on the '88 it's a separate bolt on piece.
Second, the glide pins are a different size between the two also. Different size thread into the hole, but the same shaft size.
Third, the axle flange on the end that holds the lugs on the '95 is larger in diameter.
Fourth, the pads are a bit wider on the '95.
Fifth, my '88 has a vented rotor and the hat is exactly three inches to the top.
Sixth, the '88 caliper has the inlet on the bottom and the bleeder is on the top, both inward toward the center of the axle.
I have included pics for your viewing pleasure. I don't have the parts for the '95 brakes yet, but the guy at AutoZone said I could use the '88 parts for exchange for the '95 parts as cores.

AutoZone's prices:
$10 for the four glider bolts
$52 for the two rotors
$63 for the two loaded calipers
$125 plus tax

Rik.
img_1747-medium-.jpg   img_1746-medium-.jpg   img_1744-medium-.jpg   img_1743-medium-.jpg  
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Unread 06-19-2010, 03:09 PM   #7
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Good info Rik, and thanks for the pics!

The calipers I listed for your '88 look the same as the ones in your pic, but the rotors are not. I ran into this scenario also since the thread was written, but I failed to get pics to update it.

The part numbers I listed are probably specific to the brand my local parts house uses, so I don't doubt that you found them differently elsewhere.

Please post up some pics of the new parts when you have them in hand!

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Unread 06-19-2010, 03:54 PM   #8
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Good info Rik, and thanks for the pics!

The calipers I listed for your '88 look the same as the ones in your pic, but the rotors are not. I ran into this scenario also since the thread was written, but I failed to get pics to update it.

The part numbers I listed are probably specific to the brand my local parts house uses, so I don't doubt that you found them differently elsewhere.

Please post up some pics of the new parts when you have them in hand!

Max

Will do. I should be getting the parts by Wednesday. They didn't have the loaded calipers in stock. So there it sits on stands.
I'm going to go ahead and remove the rear axle and prep my 8.8 while I wait. Still need to install the SYE too. I'm glad I have a nice garage with beer in the fridge and music to keep me company.
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Unread 07-25-2010, 03:10 AM   #9
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Hey, you guys seem pretty knowledgeable about calipers, so I pose you this question about the brake job from hell...

While working on my friends 93 YJ, one of the caliper seals was blown, so I bought a new caliper from autozone for like 25 bucks or something and received one of the ones pictured above:



The problem I have is that the threads on the bolts meant to hold it to the bracket are just too darn small, and slide right in and out of the threaded area on the caliper bracket!!

I snagged a couple of pics of the caliper on the other side with the hopes that you would be able to tell me which caliper I should have bought, since I cannot figure out what it's from, and hopefully get the right one on Monday.

The one on the passenger side:






It has "7345" and "W4" cast into it, if that helps. The Jeep also has what I take to be a Mile Marker manual locking hub conversion kit, so perhaps a different caliper was spec'd for that swap?

Any help is GREATLY appreciated so I can finish this up, been 4 awful days so far, lol. Thanks.

ed
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Unread 07-25-2010, 11:42 AM   #10
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Anybody? I have tried asking the owner, but she really doesn't remember exactly what is done to the rig.

ed
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Unread 07-25-2010, 02:15 PM   #11
RikRotorhead
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Someone along the line swapped in a different year front axle?

I'm not sure which bolts you speak of. You mean the glide bolts?
'87, '88, and '89 were one size, and in '90 they went to a different size glider bolt. The calipers are a different size and so are the pads and hoses when they changed.
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Unread 07-25-2010, 02:19 PM   #12
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OK....
Look at this pic. See where the brake line goes in? It's on the bottom (upside down in this pic).
This is out of the early axle ('88).




Now yours. Same place. Just flip the picture over....




And what you bought is on the side, as in the newer style....
See where the line goes? (orange cap)



So head back to the auto parts store and purchase the same stuff except for an '88 Wrangler, problem solved.
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Unread 07-25-2010, 07:39 PM   #13
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I really didn't see it because in the picture the caliper was upside down! And I read the post too!! Thank you guy, I will hopefully be able to finish this up on Monday now after a quick trip to the parts store.

If I were closer to Cali, I'd buy you a beer. I will let you guys know how it works out in a day or two, and if you ever have any questions about 93-07 Subarus, you just let me know

Oh, and I was talking about the bolts that actually hold the caliper to the bracket!

ed
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Unread 07-25-2010, 08:46 PM   #14
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Max should I get those anti-rattle clips? I've never had them but I noticed that someone else had them in another thread.
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Unread 07-25-2010, 10:59 PM   #15
RikRotorhead
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I really didn't see it because in the picture the caliper was upside down! And I read the post too!! Thank you guy, I will hopefully be able to finish this up on Monday now after a quick trip to the parts store.

If I were closer to Cali, I'd buy you a beer. I will let you guys know how it works out in a day or two, and if you ever have any questions about 93-07 Subarus, you just let me know

Oh, and I was talking about the bolts that actually hold the caliper to the bracket!

ed
No problem at all. Glad to help.
Altho' a beer sound's good right now.
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