Dart disc brake conversion kit

Posted By: Dodgeballs

Dart disc brake conversion kit - 10/17/13 10:25 PM

I'm looking to upgrade my 69 dart to 4.5 pattern disc setup. Right now it has the stock 4 piston caliper disc setup. I'm looking at this one kit that comes with most everything including the upper control arms.

http://www.ebay.com/itm/380685626790?

Is there anything else I might need? Should I change to a newer 2 bolt master cylinder? Will my proportioning valve setup work or should I change it?

Posted By: dogdays

Re: Dart disc brake conversion kit - 10/17/13 11:31 PM

Go directly to www.doctordiff.com and get the right stuff the first time.

R.

Posted By: Dodgeballs

Re: Dart disc brake conversion kit - 10/17/13 11:36 PM

Quote:

Go directly to www.doctordiff.com and get the right stuff the first time.

R.

Thanks. I've bought stuff from him before. One of the reasons I was looking at the item I listed was that it was in California and I'm in Hawaii. Shipping gets crazy here for anything big.

Posted By: CuriousYella70

Re: Dart disc brake conversion kit - 10/18/13 02:35 PM

If you can find the front end from a 73 A-Body with disc brakes, that might be cheaper. Granted, you might need to refurbish some of the parts but if you want to go the used route, that's what I did. Got the whole front end from a 73 Dart Sport and it's now in my 70 Duster, like you I wanted the big bolt wheels since I have that on my rear (used shortened fury axles in my 8 3/4).

Posted By: burdar

Re: Dart disc brake conversion kit - 10/18/13 02:46 PM

Or, you can keep your four piston setup and just change the rotors.

You can buy new rotors with the large bolt pattern from The Ram Man(expensive) or you can buy Mustang rotors and have them machined to fit.(much cheaper depending on how much your machinist charges you for the work)

Posted By: Rick_Ehrenberg

Re: Dart disc brake conversion kit - 10/18/13 03:45 PM

also see:

http://www.moparaction.com/Tech/archive/disc-main.html

Rick

Posted By: Challenger 1

Re: Dart disc brake conversion kit - 10/18/13 03:56 PM

Quote:

also see:

http://www.moparaction.com/Tech/archive/disc-main.html

Rick

Right click, save.

Thank you

Posted By: clonestocker

Re: Dart disc brake conversion kit - 10/18/13 04:09 PM

Quote:

also see:

http://www.moparaction.com/Tech/archive/disc-main.html

Rick

In this article it states not to use F-Body parts. I was told this was another option. Why not? I have a complete set up from a Volare. This won't work on a 72 Duster?

thx matt

Posted By: cudaboy

Re: Dart disc brake conversion kit - 10/18/13 04:14 PM

Because of this:

are taller, altering suspension geometry (camber change, bump steer, etc.), and possibly forcing the ball joints beyond their designed range, a/k/a �over angling�.

Dennis

Posted By: a12rag

Re: Dart disc brake conversion kit - 10/18/13 06:41 PM

F,M,J body spindles and disc brakes - Ok, so we have heard all about the issue of 3/8" taller . . . have used these on TWO cars now, 70 C body and 70 B Body, absolutely NO ISSUES !! I have driven both cars for thousands of miles ! No bump steer, no ball joint over angling, and you actually get some further adjustablity in your wheel alignment specs. No issue on front end alignment, and tires not wearing . . .

For myself, after having done this on TWO cars, I have no issue doing it for future projects. Rotors, bearings, seals, calipers, and pads are all readily available !

Just my two cents worth . . .

Cheers,

Mark

Posted By: dogdays

Re: Dart disc brake conversion kit - 10/18/13 07:42 PM

Board consensus seems to be that the slightly taller spindles from F, etc, bodies are OK, maybe even better.
Mopar Action's Rick Ehrenberg disagrees, although in this case I believe he is too married to Ma Mopar to see the truth.
Just my opinion, Rick!

R.

Posted By: Rick_Ehrenberg

Re: Dart disc brake conversion kit - 10/19/13 03:10 PM

Quote:

Board consensus seems to be that the slightly taller spindles from F, etc, bodies are OK, maybe even better.
Mopar Action's Rick Ehrenberg disagrees, although in this case I believe he is too married to Ma Mopar to see the truth.
Just my opinion, Rick!

R.

By actual measurement, the taller knuckles almost triple the bumpsteer.

This has been discussed ad infinitum. if you're just cruising to McDs, you'll probably never notice, I agree. But I see no reason to knowingly 'do it wrong'. Neither did MaMopar, who could have standardized on one knuckle forging and saved $$$ -- but did not.

Rick

Posted By: Supercuda

Re: Dart disc brake conversion kit - 10/21/13 08:14 PM

Quote:

Quote:

Board consensus seems to be that the slightly taller spindles from F, etc, bodies are OK, maybe even better.
Mopar Action's Rick Ehrenberg disagrees, although in this case I believe he is too married to Ma Mopar to see the truth.
Just my opinion, Rick!

R.

By actual measurement, the taller knuckles almost triple the bumpsteer.

This has been discussed ad infinitum. if you're just cruising to McDs, you'll probably never notice, I agree. But I see no reason to knowingly 'do it wrong'. Neither did MaMopar, who could have standardized on one knuckle forging and saved $$$ -- but did not.

Rick

So, what causes bumpsteer?

Hint, it ain't spindle height.

So, if Ma didn't standardize on one spindle, why do the 73 and up B's, all R's, J's, F's, M's and so forth use .... the same spindle? Even though some are longitudinal t bars suspensions and some are transverse?

Just waiting for some clown to say "isoclamp".

Oh and overangling the ball joint is BS too.

Here's some facts for you rather than someone's off the cuff nonsense.

http://www.bigblockdart.com/techpages/spindles.shtml

Posted By: Rick_Ehrenberg

Re: Dart disc brake conversion kit - 10/23/13 10:17 AM

Quote:

Quote:

Quote:

Board consensus seems to be that the slightly taller spindles from F, etc, bodies are OK, maybe even better.
Mopar Action's Rick Ehrenberg disagrees, although in this case I believe he is too married to Ma Mopar to see the truth.
Just my opinion, Rick!

R.

By actual measurement, the taller knuckles almost triple the bumpsteer.

This has been discussed ad infinitum. if you're just cruising to McDs, you'll probably never notice, I agree. But I see no reason to knowingly 'do it wrong'. Neither did MaMopar, who could have standardized on one knuckle forging and saved $$$ -- but did not.

Rick

So, what causes bumpsteer?

Hint, it ain't spindle height.

So, if Ma didn't standardize on one spindle, why do the 73 and up B's, all R's, J's, F's, M's and so forth use .... the same spindle? Even though some are longitudinal t bars suspensions and some are transverse?

Just waiting for some clown to say "isoclamp".

Oh and overangling the ball joint is BS too.

Here's some facts for you rather than someone's off the cuff nonsense.

http://www.bigblockdart.com/techpages/spindles.shtml

The factual answer is simple. For the 1973 B-body, with the rubber-isolated K-member, the UCA-to-LCA-pivot dimension increased (see graphic below), this required the taller knuckle. This same basic design was used on F, J, and M-cars, too, despite the bent-bar configuration. Excepting the 1973 rubber isolation, which prevents the K from performing its original intended purpose (tying the lognitudinals together), requiring their mass to be significantly increased, the geometry on the 1973s in fine as-is. (I have no doubt that using the short knuckles on a isolated-K car would also cause handling problems).

The site you quoted above does, in fact, show much more toe change (bumpsteer) when using the incorrect knuckles: 0.081" for the correct knuckles vs. 0.199 for the taller knuckles. Therefore, going with those numbers (I have measured greater variation) I stand corrected - there's only about 2.5 times the bumpsteer with the taller pieces.

Rick