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Ecklers AutoMotive
Username Post: Socket size for front wheel cylinder bolt?        (Topic#352421)
Posts: 21

Loc: IL
Reg: 08-12-09
08-10-18 07:13 AM - Post#2742575    

Looks like I'm going to need to get a deep socket to get the front wheel cylinders off. Unfortunately I don't have any that big so will need to pick one up. What size were the stock bolts holding the wheel cylinders on? 15/16? Thanks

1966 Biscayne 2 dr

Ecklers AutoMotive
Valued Contributor
Posts: 4085
Loc: Sweden
Reg: 08-23-07
08-11-18 10:56 AM - Post#2742716    
    In response to Novacaine

Been a while since, but I'm almost sure there is a 1/2" or 9/16" bolt that holds the wheel cylinder to the backing plate... Hidden behind crud usually. mp;fea...

Chevytalk Moderator & "15th Year" Silver Supporting Member
Posts: 5095
Loc: Muskegon, MI, USA
Reg: 03-28-02
08-11-18 11:57 AM - Post#2742726    
    In response to Novacaine

The bolts for the front wheel cylinders on my 65 have a 15/16 hex head.


65 Impala SS, 400sbc, Muncie M-22
66 Impala SS, 396, TH 400
69 El Camino, 350, TH 350
71 Short bed stepside 4x4, 350/TH 350
71 Snow plow, 4x4, 350, TH 350
72 GMC Shortbed, stepside, 427/TH 400

Posts: 189

Reg: 07-09-18
08-11-18 12:06 PM - Post#2742727    
    In response to Novacaine

Don't be surprised if you have to heat them up to get them out. I impacted mine until there was no tomorrow with no luck. Heat did the trick.

Senior Member
Posts: 333
Loc: No. White Plains, NY 10...
Reg: 06-20-01
08-12-18 07:07 AM - Post#2742807    
    In response to Mercedes

I had the same problem on my '65. When you think that it is hot enough, heat it a lot more.

Posts: 21

Loc: IL
Reg: 08-12-09
08-15-18 08:41 PM - Post#2743208    
    In response to fire259

Thanks guys, I went to Harbor Freight and picked up the right socket based on your recommendations. You guys are going to hate me, but with only a breaker bar I got both front bolts off. Other than brake dust, the inside brake components looked clean with no rust. I don't think they'd ever been replaced nor had this car probably ever seen an IL winter.

1966 Biscayne 2 dr

"17th Year" Silver Supporting Member
Posts: 5770
Loc: Moneta, VA
Reg: 09-24-01
08-16-18 05:54 AM - Post#2743224    
    In response to Novacaine

I have a 15/16's Deep Socket that I ground flat to get a better bite on the narrow hex of an anchor bolt.

On one of them one day and not wanting to use heat, I finally had to chisel off the wheel cylinder to be able to get a pipe wrench on it with a 6 Ft pipe on my 3/4 Drive breaker bar to finally get it to budge.

I called it the "anchor bolt from hell".

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-Vintage Chevrolet Club of America

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