'60 Apache 2WD front wheel cylinder bolt size - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Desert dog · 03-27-2022, 04:10 PM

We're moving on to the front brakes and have run into a conundrum. The large bolt holding the wheel cylinder's in place appears to be an odd size. A 1" 6 point socket is loose and a 15/16" six point is too small. Is it possible this is a 31/32"?
My cursory calculations show that a 25 mm falls roughly between the two above mentioned sizes so I'm going to purchase one. It looks like
I'll have to grind the chamfer off of it though as the bolt faces are pretty shallow.
Any input would be greatly appreciated.

Regards,
Desert Dog

Desert dog · 03-29-2022, 12:54 PM

FYI. To answer my own question, the bolts appear to be 1". They measured .996" with a caliper.
That said a 1" was still too loose. So I purchased a 25mm deep impact and ground down the chamfer. It fit perfect . With a days soak from PB Blaster and a rattle gun they came right off.

**cwcarpenter98** · 03-29-2022, 02:21 PM

Thanks for sharing how you fixed it! I haven't pulled one myself, so I didn't have the answer previously.

03-27-2022, 04:10 PM	#1
Desert dog Registered User Join Date: Aug 2020 Location: Tucson, AZ Posts: 51	'60 Apache 2WD front wheel cylinder bolt size We're moving on to the front brakes and have run into a conundrum. The large bolt holding the wheel cylinder's in place appears to be an odd size. A 1" 6 point socket is loose and a 15/16" six point is too small. Is it possible this is a 31/32"? My cursory calculations show that a 25 mm falls roughly between the two above mentioned sizes so I'm going to purchase one. It looks like I'll have to grind the chamfer off of it though as the bolt faces are pretty shallow. Any input would be greatly appreciated. Regards, Desert Dog Last edited by Desert dog; 03-27-2022 at 09:03 PM.

03-29-2022, 12:54 PM	#2
Desert dog Registered User Join Date: Aug 2020 Location: Tucson, AZ Posts: 51	Re: '60 Apache 2WD front wheel cylinder bolt size FYI. To answer my own question, the bolts appear to be 1". They measured .996" with a caliper. That said a 1" was still too loose. So I purchased a 25mm deep impact and ground down the chamfer. It fit perfect . With a days soak from PB Blaster and a rattle gun they came right off.

03-29-2022, 02:21 PM	#3
cwcarpenter98 Senior Member Join Date: Jan 2018 Location: Hickory Flat, GA Posts: 4,491	Re: '60 Apache 2WD front wheel cylinder bolt size Thanks for sharing how you fixed it! I haven't pulled one myself, so I didn't have the answer previously. __________________ Christian Carpenter 1963 C10 - Frankentruck 283, Muncie 3 speed with overdrive Overdrive wiring here 1963-ish truck bed trailer - Half-Wit 1981 C10 - Penny 305, th350 --> Soon to be 350, Saginaw 4 speed 1995 Dodge Dakota Sport "I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson

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