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Disc Brake Problem

Printed From: TheAMCForum.com
Category: The Garage
Forum Name: Suspension, Steering, Brakes & Wheels
Forum Description: What makes it stop, turn, and smooths the ride
URL: https://theamcforum.com/forum/forum_posts.asp?TID=40217
Printed Date: Mar/28/2024 at 4:12am
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Topic: Disc Brake Problem
Posted By: quick71silver
Subject: Disc Brake Problem
Date Posted: Jun/04/2012 at 7:49pm
I have worn rotors on my 71 amx and someone who owned it prior to me plugged the bleeder valve hole with something.  I have looked at aftermarket brakes but I'm not sure where to go.  Wilwood brakes are everywhere online but they require 15" rims and I have 14's.  There is also aerospace but I don't know if they're street legal and if they are are they temperamental brakes?  Could I find new rotors and just drill out, flush out the chips, and tap the larger hole?  



Replies:
Posted By: sidewinder
Date Posted: Jun/04/2012 at 8:07pm
Rotors should be available and there is no reason you can fix the issue with your bleeders.   That will keep the car original and probably save you several hundred dollars too.....just my 2 cents....

Chuck Page


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Chuck Page ,AKA Sidewinder
1968 "BLACK CHERRY" Javelin
Previous owner of 2013 Heritage Cup winner 1970 BBO AMX




Posted By: 73hornut
Date Posted: Jun/04/2012 at 8:34pm
Bleeders plug up over time with no dust covers, just ream it out by hand, with an appropriate size drill bit, spray it clean, put back in.

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71 Javelin
74 Gremlin
79 Spirit AMX
Rogue Valley Rumblers
Like Us on FB
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Posted By: pit crew
Date Posted: Jun/04/2012 at 9:12pm
Originally posted by quick71silver quick71silver wrote:

I have worn rotors on my 71 amx and someone who owned it prior to me plugged the bleeder valve hole with something.  I have looked at aftermarket brakes but I'm not sure where to go.  Wilwood brakes are everywhere online but they require 15" rims and I have 14's.  There is also aerospace but I don't know if they're street legal and if they are are they temperamental brakes?  Could I find new rotors and just drill out, flush out the chips, and tap the larger hole?  
Not trying to push your decision one way or the other but Wilwood does not "require" 15" rims. The real issue is they may not fit "all" 14" rims. I am using 14" 50 series from Wheel Vintiques on my Hornet and the fit is just fine with the Wilwoods. You would have to measure your rims and check with Wilwood on the fitment. I love the Wilwood discs. I had the Bendix single piston discs before and the clunk the the floating calipers made on bumps drove me crazy.




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73 Hornet - 401EFI - THM400 - Twin Grip 20


Posted By: farna
Date Posted: Jun/05/2012 at 1:25pm
Steel 24" wheels should fit with no problems with the Wilwood setup. Cast 14" wheels are a different story. Some are cast a lot thicker than others.

You can get rebuilt calipers for your car for around $30 each, but you'd still have to replace the rather expensive rotors. Aerospace makes a drag setup with solid rotors and a vented rotor system. The vented rotor system is about the same performance wise as the Wilwood.

You could also use a Scarebird setup. They are made to swap from drum brakes, but will work with the disc spindle now that it sits on top of the spindle. You might need to remove the original disc bracket and use some grade 8 washers to space it out or turn the bracket so that it doesn't interfere with the new calipers.


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Frank Swygert


Posted By: quick71silver
Date Posted: Jun/05/2012 at 11:03pm
Thanks for the input.  Right now I have the 14" steel 8 slot rims with the volcano centers.


Posted By: mchaggis
Date 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!



Posted By: quick71silver
Date Posted: Jun/11/2012 at 7:41pm
So what is supposed to be on a 71 amx bendix, cardone?


Posted By: 73hornut
Date 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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71 Javelin
74 Gremlin
79 Spirit AMX
Rogue Valley Rumblers
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Posted By: ramblinrev
Date 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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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)


Posted By: farna
Date 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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Frank Swygert


Posted By: ramblinrev
Date 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.



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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)


Posted By: farna
Date 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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Frank Swygert


Posted By: ramblinrev
Date 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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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)


Posted By: farna
Date 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?

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Frank Swygert


Posted By: ramblinrev
Date 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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