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Disc Brake Problem |
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ramblinrev ![]() Moderator Group ![]() ![]() Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11545 |
![]() ![]() ![]() ![]() ![]() 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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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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farna ![]() Supporter of TheAMCForum ![]() ![]() Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19692 |
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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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Frank Swygert
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ramblinrev ![]() Moderator Group ![]() ![]() Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11545 |
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Do the Delco and the Bendix use the same rotor on Concord and Spirit?
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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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farna ![]() Supporter of TheAMCForum ![]() ![]() Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19692 |
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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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Frank Swygert
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ramblinrev ![]() Moderator Group ![]() ![]() Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11545 |
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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 |
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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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farna ![]() Supporter of TheAMCForum ![]() ![]() Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19692 |
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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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Frank Swygert
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ramblinrev ![]() Moderator Group ![]() ![]() Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11545 |
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'71s didn't come with Bendix disc brakes. They came with Kelsey-Hayes single piston calipers.
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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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73hornut ![]() AMC Addicted ![]() ![]() Joined: Jul/03/2007 Location: Southern Oregon Status: Offline Points: 3130 |
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71 Javelin
74 Gremlin 79 Spirit AMX Rogue Valley Rumblers Like Us on FB https://www.facebook.com/groups/1602825606650796 |
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quick71silver ![]() AMC Fan ![]() ![]() Joined: May/29/2012 Location: Mass Status: Offline Points: 4 |
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So what is supposed to be on a 71 amx bendix, cardone?
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mchaggis ![]() AMC Apprentice ![]() ![]() Joined: Aug/29/2010 Location: New Zealand Status: Offline Points: 239 |
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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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