66 GT Front Disc Brake Caliper Bolts - Vintage Mustang Forums
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post #1 of 14 (permalink) Old 09-19-2019, 03:15 PM Thread Starter
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66 GT Front Disc Brake Caliper Bolts

I'm removing the front calipers on my 66 GT to clean and paint. The caliper bracket bolts have a male "E Torx like" head but looks like a 12 point head. Can I use a standard 12 point socket on these. Just want to ask before I try and strip the head.
Thanks
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post #2 of 14 (permalink) Old 09-19-2019, 03:26 PM
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Not sure if you have the stock bolts there. But I will check and see what mine look like when I get home in a few minutes. It has been a long time since I've had mine off

My 1st car...
'66 Tahoe Turquoise/ Aqua coupe
•289 / 4100 •C4 Auto •Disc Brakes
•Dual Exhaust •Quick Manual Steering
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'66 Emberglo / Parchment deluxe coupe
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'66 Nightmist / Blue & white deluxe coupe
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WAITING FOR RESTORATION

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post #3 of 14 (permalink) Old 09-19-2019, 04:02 PM
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It would want to be a 'Very' good fit..
Might be worth it to buy/borrow a torx female socket set..

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post #4 of 14 (permalink) Old 09-19-2019, 04:05 PM
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Good question. The OE bolts are a 7/16-14 X 1 5/8 GR-5 3/4 AF YB, No. 378225-S that look like this...
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post #5 of 14 (permalink) Old 09-19-2019, 04:17 PM
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I just looked at mine and they are six point.
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post #6 of 14 (permalink) Old 09-19-2019, 04:31 PM
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A lot of the ARP fasteners (maybe all of them?) have 12 point heads and a standard 12 point socket fits them.
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post #7 of 14 (permalink) Old 09-19-2019, 04:38 PM
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Yes, use a 12 point socket.
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File Type: jpg 6-160315212221.jpg (136.4 KB, 7 views)
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post #8 of 14 (permalink) Old 09-19-2019, 09:49 PM Thread Starter
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Thanks everyone for the great info. I'll be pulling the calipers tomorrow now that I know what I'm doing.
Special thanks to Chock for the photo. That's what mine look like.
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post #9 of 14 (permalink) Old 09-19-2019, 11:15 PM
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Seems like I’ve seen the 12-point caliper bolts before...... maybe not on the 65-67 Mustang units but on the big Kelsey Hayes calipers (Galaxies). Pretty sure I’ve got one of the bolts in my junk drawer.

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post #10 of 14 (permalink) Old 09-20-2019, 05:29 AM
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Quote:
Originally Posted by GT289 View Post
Seems like I’ve seen the 12-point caliper bolts before...... maybe not on the 65-67 Mustang units but on the big Kelsey Hayes calipers (Galaxies). Pretty sure I’ve got one of the bolts in my junk drawer.
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I have seen them on dozens of unrestored Mustangs, they are correct.

John
67 289 GTA Dec 20 1966 San Jose
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post #11 of 14 (permalink) Old 09-24-2019, 10:06 AM
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I have the 12 point bolts on my '66.
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post #12 of 14 (permalink) Old 09-24-2019, 10:13 AM
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Notice the safety wire on the caliper mounting bolts. That is the way to wrap the knot in the wire.

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post #13 of 14 (permalink) Old 09-24-2019, 11:11 AM
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That isn't the way it's done on aircraft. Stainless wire is used, twisted between the bolts, threaded through the bolt heads in the tightening direction and ends twisted outside the bolt group. But is that needed on a car...I doubt it.

'66 GT Coup, restoration after 43 years in indoor storage
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post #14 of 14 (permalink) Old 09-24-2019, 12:30 PM
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Quote:
Originally Posted by SiriusBiz View Post
Thanks everyone for the great info. I'll be pulling the calipers tomorrow now that I know what I'm doing.
Special thanks to Chock for the photo. That's what mine look like.

That's what mine look like also.

66 Convertible, GT clone. 289 4V, C4. Springtime yellow with black top
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