1967 Coronet Factory Brakes

[67 440 vert]

I have a 67 Coronet 440 convertible and have a viscous vibration from the front end when applying the brakes. It only does it when the brakes have warmed up after I've drove it for 10 miles or so. I replaced the shoes and found a new set of drums that are not exactly like the originals. The flange bolt pattern area on the new drum is about 5/16" thick where the original ones were more like 1/16" thick. Had the new drums turned and it helped but didn't solve the problem. I do know there was a chatter spring on the old drums where the new ones don't have one. Everything is new so I'm scratching my head at this one.:violent-smiley-100: Maybe someone can point me to something I just haven't found. Worst case what disk brake setup will interchange with minimal mods? Really want to keep it original.

 

[440roadrunner]

Does it drive OK? You certain there isn't something in the studs / center hole / wheels and nuts keeping it all from tightening down? What do the drums look like internally? Any tool marks? EG I've seen drums turned by a dull or broken tool at fast speed, made sort of a scroll pattern in the drums, like a record player.

 

[Cranky]

Do the drums run true? .010 out of round is enough to feel. What condition are the front end parts? .010 shouldn't be enough to be vicious but you would feel it in the steering wheel. The anti chatter spring is mainly for machining purposes.....

 

[theman440]

Sounds like the drums have hard spots in 'em. I'd bet money on it . . .

No way to get rid of 'em either.

 

[440roadrunner]

Sounds like the drums have hard spots in 'em. I'd bet money on it . . .

No way to get rid of 'em either.

He said the drums are new.

 

[miller]

How about the front wheel bearings? Adjusted right, and in good shape?
If their not good, could toss some wobble into the deal. Or, the drums could be out-of-round.

 

[snakeoil24]

I have a 67 Coronet 440 convertible and have a viscous vibration from the front end when applying the brakes. It only does it when the brakes have warmed up after I've drove it for 10 miles or so. I replaced the shoes and found a new set of drums that are not exactly like the originals. The flange bolt pattern area on the new drum is about 5/16" thick where the original ones were more like 1/16" thick. Had the new drums turned and it helped but didn't solve the problem. I do know there was a chatter spring on the old drums where the new ones don't have one. Everything is new so I'm scratching my head at this one.:violent-smiley-100: Maybe someone can point me to something I just haven't found. Worst case what disk brake setup will interchange with minimal mods? Really want to keep it original.

Bent backing plate! If you need I have a pair for 50.00 with spindles.

 

[67 440 vert]

Does it drive OK? You certain there isn't something in the studs / center hole / wheels and nuts keeping it all from tightening down? What do the drums look like internally? Any tool marks? EG I've seen drums turned by a dull or broken tool at fast speed, made sort of a scroll pattern in the drums, like a record player.

She does have a very slight vibration at 55-60 but figured could come from the tire balance. I've changed the studs, checked the center hole to make sure its seating all the way and the drums looked excellent after I had them turned.

 

[67 440 vert]

Do the drums run true? .010 out of round is enough to feel. What condition are the front end parts? .010 shouldn't be enough to be vicious but you would feel it in the steering wheel. The anti chatter spring is mainly for machining purposes.....

Drums are new and true within .005. Front end is all new kit from PST.

 

[red 69 runner]

I had a problem like that once with a ford truck,,it was the u joints in the drive shaft believe it or not.wont hurt to check.

 

[Ed Price Jr]

I had a similar problem on my '67 R/T. It turned out to be the Idler & Pitman Arms.

 

[67 440 vert]

Well I figured it out! A couple of things was causing my headaches. 1st when you have a front end alignment done, go back and check their work. 1 of the upper control arm bushing bolts was not as tight as it should have been. 2nd as mentioned the drums do have hot spots but not so bad that I'm going to complain right now BC she doesn't yank the wheel out of my hands any longer. I also tightened the crap out of all the suspension bolts on everything on the front end with a 2ft long snap on ratchet. Still have a very mild vibration when hammering on the brakes from the hot spots I believe. Thanks to everyone for the input. Made me re-think the situation.

 

[theman440]

Gl
ad your happy with it now.

 

[67 440 vert]

You were right theman440.....aftermarket drums were scrap metal from the get go...$200 pissed down the tubes.