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Disc Brake Problem

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farna View Drop Down
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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 5:25pm
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.
Frank Swygert
American Motors Cars Magazine
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ramblinrev View Drop Down
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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 5:35pm
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 6:50pm
74 Hornet Hatchback X twins
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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 6:06pm
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. 
Frank Swygert
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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 10:15pm
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?
74 Hornet Hatchback X twins
62 American Convertible
70 AMX 360 4-speed
70 Javelin SST 390
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farna View Drop Down
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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 6:58am
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 7:00am
Frank Swygert
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ramblinrev Quote  Post ReplyReply Direct Link To This Post Posted: Jun/13/2012 at 6:49pm
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!
74 Hornet Hatchback X twins
62 American Convertible
70 AMX 360 4-speed
70 Javelin SST 390
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