Wheel Cylinder Anchor Bolt

[69GMCLonghorn]

Wow... I had it easy. I just read a thread from the guy that snapped off the anchor bolt while trying to remove it to replace his wheel cylinders. All I had to do was buy an $11 socket and use my impact gun with all it had in it to remove the anchor bolt. So... now for the question:

It's a 1970 C10 with the world's smallest brakes (fronts are 11 x 2"). The wheel cylinder has the hoop integrated into it, which the anchor bolt goes through and ultimately into the spindle. Hopefully I have painted the picture well enough (due to lack of an ACTUAL picture currently!). What is the torque spec on that anchor bolt?! Anybody know? I have a factory shop manual that tells the inch lbs torque on the smallest most insignificant hardware on the whole truck, but not that bolt! I'd like to get it tight enough, but not snap anything off putting it back together.

Thanks in advance!

[LockDoc]

Originally Posted by 69GMCLonghorn

Wow... I had it easy. I just read a thread from the guy that snapped off the anchor bolt while trying to remove it to replace his wheel cylinders. All I had to do was buy an $11 socket and use my impact gun with all it had in it to remove the anchor bolt. So... now for the question:

It's a 1970 C10 with the world's smallest brakes (fronts are 11 x 2"). The wheel cylinder has the hoop integrated into it, which the anchor bolt goes through and ultimately into the spindle. Hopefully I have painted the picture well enough (due to lack of an ACTUAL picture currently!). What is the torque spec on that anchor bolt?! Anybody know? I have a factory shop manual that tells the inch lbs torque on the smallest most insignificant hardware on the whole truck, but not that bolt! I'd like to get it tight enough, but not snap anything off putting it back together.

Thanks in advance!

This is as close as I could find. Seems pretty high to me but I guess that could be why they are so hard to remove....

Here are some torque specs for a 1969 chevelle out of the GM chassis service manual.

FRONT SUSPENSION
spherical joint upper stud nut 50 ft lbs
lower stud nut 80 ft lbs
stud to control arm nuts (service) 25 ft lbs
steering arm attaching nuts 85 ft lbs
shock absorber upper shaft nut 8 ft lbs
lower attachment 20 ft lbs
stabilizer bar frame bracket bolts 15 ft lbs (remote but could be part of your problem)
link nuts 15 ft lbs
lower control arm inner pivot nuts 80 ft lbs
upper control arm attaching nuts 50 ft lbs
collar bolts 45 ft lbs
brake anchor pin drum brakes 130 ft lbs
brake anchor bolt disc brakes 120 ft lbs
wheel stud nuts 65 ft lbs

REAR SUSPENSION
upper control arm front bushing 80 ft lbs
rear bushing 80 ft lbs
lower control arm front bushing 80 ft lbs
rear bushing 80 ft lbs
shock absorber upper 12 ft lbs
lower 65 ft lbs
universal joint companion flange 14 ft lbs

Another site mentioned 65# but that doesn't seem like enough....

LockDoc

[jcwren]

I know this is an old thread, but any idea where to find replacement lock washers?

[LockDoc]

Originally Posted by jcwren

I know this is an old thread, but any idea where to find replacement lock washers?

I answered your post in the other thread.

LockDoc

[jcwren]

Saw that. Appreciate the reply

[wpavlis]

Are the lock washers actually required? If so i guess i should make a couple as i was just about finished replacing my front wheel cylinders. Thanks

[jcwren]

Maybe for spacing. At 130 foot pounds of torque, I doubt they'll walk out on their own.

But I'm OCD, and like to do things right.

[HO455]

Lock washers are old school. If the nut doesn't bottom out on the stud use a permanent locktite instead of a lock washer.

[wpavlis]

Its more of a bolt. I put it in for spacing. I would prefer not to use permanent locktite in case it ever needs to be removed again. 130ft lbs should hold it.

[jcwren]

Originally Posted by wpavlis

Its more of a bolt. I put it in for spacing. I would prefer not to use permanent locktite in case it ever needs to be removed again. 130ft lbs should hold it.

And considering it's what holds the wheel cylinder in place, there is a more than non-zero chance it will need to be removed again. Definitely agree on the non-permanent Loctite.