1966 bronco drum 10" minimum thickness

[harleyabarton]

does anyone know the minimum thickness of the 10" drum for a 1966. im trying to get them resurfaced but its not readable on the drum

 

[DirtDonk]

Bummer. Soon as I read the title I was thinking it should be cast right into the part.
Then again, '66 stuff has it's own personality! Is yours all rusted up or something? Or just not cast in very clearly?

Lots of full '66 restorations done over the years here, so hopefully someone has that info handy.

Paul

 

[Viperwolf1]

It will be expressed as maximum inside diameter. Typically it's 10.090" but that includes .060" of prior wear/machining and .030" for future wear. In other words a shop won't turn it past 10.060". If it's already bigger you should replace it.

 

[75MIKE]

By the time you pay to have them re-surfaced and have the the new brake shoes re-arched to fit them. Pretty close to a wash to just buy new drums.

 

[harleyabarton]

Bummer. Soon as I read the title I was thinking it should be cast right into the part.
Then again, '66 stuff has it's own personality! Is yours all rusted up or something? Or just not cast in very clearly?

Lots of full '66 restorations done over the years here, so hopefully someone has that info handy.

Paul

thanks for all your help, Paul btw. and ya it was maybe cast but everything is un-readable. but as a update to my last threat. I changed the shoes and infact the passanger side shoes had been installed backwards so i installed new shoes the correct way. put the drums and tires back on and the problem seemed to get worse. so my suspect is now the drums. this proccess others on the threat are calling "arching" im assume is similar to breaking in new brakes? i ordered some new drums but i got the wrong diameter ones i have a 10" but i ordered a 11" really just my fault i assumed 66 only had the one size and i just ordered the cheaper option. so i ordered the right one in but they wont get here till monday. so i guess ill have to wait and see. only problem is i have a car show tomorrow and im trying to sell the car so i REALLY hope nobody wants to drive the car untill AFTER i have this issue fixed.

 

[harleyabarton]

It will be expressed as maximum inside diameter. Typically it's 10.090" but that includes .060" of prior wear/machining and .030" for future wear. In other words a shop won't turn it past 10.060". If it's already bigger you should replace it.

thanks! im going to assume if theres only about .090 of wiggle room to play with mine is probably way beyond this.

 

[harleyabarton]

By the time you pay to have them re-surfaced and have the the new brake shoes re-arched to fit them. Pretty close to a wash to just buy new drums.

ya I went ahead and ordered new drums... hoping this will fix my issue. my existing drum on my passenger side has large ridges all over it and in fact made the problem more severe when i changed the shoes. the curious thing is i the passanger side also had the shoes installed backwords with the shorter shoe on the rear side.

I'm assuming "arching" a drum is similar to breaking in a rotor and pads. do you have to have a machine or can you do it but driving and then slamming on the brakes? thanks for the advice.

 

[Broncomt]

I'm assuming "arching" a drum is similar to breaking in a rotor and pads. do you have to have a machine or can you do it but driving and then slamming on the brakes? thanks for the advice.

Rearching refers to the shoes to fit the drum diameter. Can't re-arch drums.

 

[B RON CO]

Hi, you can drop the shoe into drum and see how much contact the lining contacts the drum.
If the whole lining is touching the drum the " shoe fits".
If just the middle is touching the drum the brake will not have good stopping power.
Good luck