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Disc Brake Problem

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ramblinrev View Drop Down
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    Posted: Jun/13/2012 at 5:49pm
Thanks for clarifying! I knew the '79+ rotor was used on '82-83 Concords and Spirits, so I always believed those were Bendix brakes. I'll correct my earlier post, and yield to your expertise, Frank!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Jun/13/2012 at 5:58am
YES. The rotor is the same. The difference between the Bendix and Delco are the way the caliper mounts -- Bendix slide on the frame (caliper mount), Delco has screw in pins that support the caliper. The Delcos are considered "low drag" and are much less likely to stick than the Bendix. The 3.1" piston Bendix rotors (big bearing also) have a thicker rotor, all other ventilated rotors are about the same thickness.

The 79+ rotor (and 77-78 small Bendix) is 0.88" thick, 75-78 big Bendix 1.19", and 71-74 K-H rotors are 1.00" thick. I would think the offset is about the same. The 79+ rotors may work with the K-H calipers -- there should be 1/4" of travel in the piston. Wear is 0.07" (from factory to minimum thickness), just a little over 1/16", for all. So max travel with the thinner rotor and K-H calipers would be 0.19", just under 1/4" (0.25"). I wonder if anyone has tried this, since the K-H rotors are over $100 and hard to find?

Edited by farna - Jun/13/2012 at 6:00am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ramblinrev Quote  Post ReplyReply Direct Link To This Post Posted: Jun/12/2012 at 9:15pm
Originally posted by farna farna wrote:

The Delcos were also used on the Spirits and Concords in 82 and 83. The sliding Bendix type may have had some overlap into 82, but the 82 TSM just shows the Delco pin type calipers. 

Do the Delco and the Bendix use the same rotor on Concord and Spirit?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Jun/12/2012 at 5:06pm
The Delcos were also used on the Spirits and Concords in 82 and 83. The sliding Bendix type may have had some overlap into 82, but the 82 TSM just shows the Delco pin type calipers. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ramblinrev Quote  Post ReplyReply Direct Link To This Post Posted: Jun/12/2012 at 4:35pm
Originally posted by farna farna wrote:

AMC DISC BRAKES:
65-70 - Bendix four piston, solid rotors
71-74 - Kelsey Hayes 2.75" single piston
75-78 Matador - Bendix 3.1" single piston, big bearing rotors
75-76 - small cars - Bendix 3.1" single piston, big bearing rotors
77-78 small cars - Bendix 2.6" single piston, big bearing rotors
79-81 - Bendix 2.6" single piston
82+ - Delco 2.6" single piston

All used the same wheel bearings as drum brakes unless otherwise noted.
A tweak to Frank's list:
Bendix big bearing brakes were introduced during the '74 model year as a running change, somewhere around mid-year (and the '74 model run went into November of '74). So quite a few '74's came with Bendix disc brakes.



Edited by ramblinrev - Jun/13/2012 at 5:50pm
74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384
70 AMX 360 4-speed (since 1981)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Jun/12/2012 at 4:25pm
AMC DISC BRAKES:
65-70 - Bendix four piston, solid rotors
71-74 - Kelsey Hayes 2.75" single piston
75-78 Matador - Bendix 3.1" single piston, big bearing rotors
75-76 - small cars - Bendix 3.1" single piston, big bearing rotors
77-78 small cars - Bendix 2.6" single piston, big bearing rotors
79-81 - Bendix 2.6" single piston
82+ - Delco 2.6" single piston

All used the same wheel bearings as drum brakes unless otherwise noted.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ramblinrev Quote  Post ReplyReply Direct Link To This Post Posted: Jun/11/2012 at 9:36pm
Originally posted by quick71silver quick71silver wrote:

So what is supposed to be on a 71 amx bendix, cardone?

'71s didn't come with Bendix disc brakes. They came with Kelsey-Hayes single piston calipers.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 73hornut Quote  Post ReplyReply Direct Link To This Post Posted: Jun/11/2012 at 8:31pm
Originally posted by farna farna wrote:

Steel 24" wheels should fit with no problems with the Wilwood setup.
But you may have problems else where.Shocked
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Post Options Post Options   Thanks (0) Thanks(0)   Quote quick71silver Quote  Post ReplyReply Direct Link To This Post Posted: Jun/11/2012 at 7:41pm
So what is supposed to be on a 71 amx bendix, cardone?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mchaggis Quote  Post ReplyReply Direct Link To This Post Posted: Jun/06/2012 at 5:45am

I've just given up on the Bendix 4 pistion set up on my 69 Javelin and ordered the Wilwood set-up.   I've only just trialed fitted one side as yet but the quality and fitment of them is very impressive.  In short I would recommend them too anyone thinking about an up-grade.  I'm running 14" steel rims and have about 7/16" clearance.  Wilwood have made an awesome set-up and for the $ they're cheap.  I got mine from Southwest Speed and even with postage to New Zealand, exchange rate etc, they are well worth it!  Well done Wilwood!!!  Bloody awesome!

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