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 Post subject: Disk Brake upgrade Q
PostPosted: Sun Feb 25, 2018 9:55 am 
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Supercharged
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My 67 Dart has K&H factory front disks with 4” bolt circle. Problem is both spindles have worn where inner bearing rides. In other words, race is not snug on spindle allows movement of wheel &,tire when correct torque of nut is set. This makes for slop in steering feel.

I have found several sources for new replacement spindles listed for B & C body cars, but not for A body. Most of the disk brake upgrade kits found in various catalogs, and sites such as Firm Feel for A Bodies have listings including new spindles in their kits as well as new upper control arms, upper and lower ball joints, and dust shields. These look like an adaptation of late A body 4 ½” bolt circle single piston caliper, and what looks to be those said B & C body spindles.

I would like to just replace my factory 10” spindles currently fitted with K & H disks, and dust shields. Could these B & C body spindles be use with my K & H equipment?

If not, I may as well step up to converting to 15x7” wheels, 4 ½” bolt circle, and all the rigging in one of the off the shelf disk brake kits.

I have 8 ¾” rear axle with 489 housing, and 4” bolt circle, equipped with 10” x 1 ¾” drums. Can these axle shafts be re-drilled to accommodate 4 ½” bolt circle? Or would it be more cost effective to purchase new axle shafts over paying for machine shop time? I’m thinking I would like to retrofit rear disk brakes.

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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Sun Feb 25, 2018 11:11 am 
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See here :D

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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Mon Feb 26, 2018 6:57 am 
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Supercharged
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I recall the Belzona discussion a while back. Not really interested in that process with all the steps & cost to a finished repair.

I know B & C bodies use Bendex brake systems. So are these aftermarket " A, B, C" hubs are Bendex like clones? What brake manufacturer produced late A Body single piston disk brake? I'm thinking that getting away from K&H set up may in the years to come be more wallet friendly. Also I noticed a small red drop of an unidentified oil clinging from dust shield backing plate which may or may not be brake fluid from 10 year old reman calipers... I have not pulled wheel to investigate.

Due to a big negative caster problem I installed a pair of CCP tubular upper control arms 10 years ago ( I remember Dan's warning on use of CCP UCA). I have found over the years that dust cup shielding upper ball joint will not seal and keep joint dry and clean, requiring frequent greasing every few weeks, 500 miles (which makes a royal mess of things under there), or when I hear some suspension movement noise from front end.

So I'm beginning to think all new brake, spindle, and upper control arms may eliminate the several headaches listed above. Additionally or hopefully once head is rebuilt, new cam installed, stable and higher vacuum will be available at idle allowing addition of power brakes to the old girl.

Back to 8 3/4 rear axle bolt circle re-drill Q, can it be done?

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67' Dart GT Convertible; the old Chrysler Corp.

82' LeBaron Convertible; the new Chrysler Corp

07' 300 C AWD; Now by Fiat, the old new Chrysler LLC



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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Mon Feb 26, 2018 8:06 am 
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I have heard others can do the SBP to BBP redrill on stock 8.75" axles. I have not done it myself, but with a not-huge-HP car, I think it would be fine. Just have to find a good shop to do it... Doctordiff.com has nice brake and susp and spindles + kits and he can advise on those axles too, I suspect.

Lou

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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Mon Feb 26, 2018 4:37 pm 
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I redrilled a set of stock SBP 8 3/4 axles, to large LBP for my Cuda. I drilled them for 1/2 inch screw in studs, not press in splined studs.

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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Mon Feb 26, 2018 7:10 pm 
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Yes, that is the key I forgot - screw in studs.

Lou

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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Mon Feb 26, 2018 9:45 pm 
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Do you have a link or part number for these screw-in studs? I'll probably be doing the same thing for the 8-3/4" I picked up.

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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Tue Feb 27, 2018 3:15 am 
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Strange, Moser, ARP, etc, sell them through Summit. I bought a bunch a few years back that were 2" and 3" long. Search "screw in wheel studs" on Summit and you find a bunch.

Lou

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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Tue Feb 27, 2018 3:50 am 
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I did mine the cheap way. I used 1/2 fine thread allen head bolts. The problem with this method is the heads of the bolts are so thick they hit the e-brake strut, so the strut needs to be removed. This is OK on a race car, but not viable on a street car. Also, after the bolts/studs are installed, put a tack weld on the head of the bolt to the flange, just to make sure the bolt can't back out when running the wheel nut,

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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Wed Feb 28, 2018 8:23 am 
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Any welding on an alloy steel heat treated critical component makes me nervous. Drilling allen heads and safety wire would be another less risky solution to that problem, and reversible, IMO.


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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Mon Mar 05, 2018 5:52 am 
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Supercharged
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I called Doctor Diff the other day, one of the topics was re-drilling my small bolt pattern axle to convert it to a 4 1/2" circle. He said best to just purchase new axles which he explained the drawbacks of said conversion. He sells a pair for 300 bucks that are stronger than factory part.

I'm still mulling over this conversion.

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67' Dart GT Convertible; the old Chrysler Corp.

82' LeBaron Convertible; the new Chrysler Corp

07' 300 C AWD; Now by Fiat, the old new Chrysler LLC



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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Mon Mar 05, 2018 6:47 am 
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If you have the coin... 4whl discs. So nice...

Lou

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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Tue Mar 06, 2018 5:25 am 
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Supercharged
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Lou:
Quote:
If you have the coin... 4whl discs. So nice...


I'm leaning in that direction.

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67' Dart GT Convertible; the old Chrysler Corp.

82' LeBaron Convertible; the new Chrysler Corp

07' 300 C AWD; Now by Fiat, the old new Chrysler LLC



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 Post subject: Re: Disk Brake upgrade Q
PostPosted: Thu May 31, 2018 5:44 am 
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TBI Slant 6

Joined: Sat Nov 12, 2011 10:04 am
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Location: Upper So. CA
Car Model*: '65 Valiant 170 T5
Some exotics employ a spacer between the inner and outer wheel bearings. These have to be made and tuned fairly precisely because they set the bearing pre-load, but once made changing bearings is not an issue because of the extremely tight tolerances quality bearings are made to. Off-road racers also do this to gain strength in the front spindles because it effectively increases the OD of the spindle. With such a spacer in place you no longer have to set the pre-load with the spindle nut and can simply torque the nut and cotter pin it.

I can see this approach would also 'save' a rare spindle in that the bearing would be locked into concentricity with the spindle and unable to move.

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