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Extreme Veteran
Posts: 391
 
Location: Brisbane | Hi im just wanting to upgrade to disk brakes on my 58 plymouth. I heard there was someone in australia on this forum that maybe able to help. Ive been told maybe au falcon diff measures up fine just a saddle change and i was hoping someone had a solution for the front like falcon rotors and hq calipers or similar. Also will need a master cyl. If you can help please let me know. Thanks |
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Expert 5K+
Posts: 6552
  
Location: Newark, Texas (Fort Worth) | Oz Steve can probably help you, mate. He is on one of the Christine car clubs sites. Marc in Newark...TX |
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Extreme Veteran
Posts: 391
Location: Brisbane | Cheers Mark |
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Extreme Veteran
Posts: 310
Location: Newcastle Australia | I used an XG Falcon ute/panelvan diff in my 59 dodge. Au diffs are getting harder to come by because the taxis guys flog them.
The XG diff is a bit wider than the original but there is still plenty of room to slip 10inch wheels under the back. From memory the difference is about 8mm.
The saddles were cut off the dodge diff and welded to the XG diff. |
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Extreme Veteran
Posts: 391
Location: Brisbane | Thanks guys. I was hoping to hear from someone who had used the part's i want to use as the diff is a more modern lsd too |
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Regular
Posts: 94
Location: New Zealand | I used VJ Valiant hubs, rotors and calipers on my 57 savoy and ran a VJ master cylinder as well. It required a spacer on the axle to push the hub out to the right position and then it was just a flat 6mm plate bolted to the back of the stub axle to mount the calipers on. Pretty straight forward thing to do and worked really well, at the moment I'm working on using the same set up for my Belvedere but looking at a new type of bracket to hold the calipers so as to delete the need for the spacer on the axle and allow the use of the original hub with AU rotors.
Cheers Norm |
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Extreme Veteran
Posts: 310
Location: Newcastle Australia | Front disc brakes with Aussie bits.
I used Falcon stub axles on mine but the front end no longer has sufficient castor. So I think I am back to the drawing board. ( I must have done the maths upside down because I thought I would have more castor)
Original 1959 Dodge king pin inclination angle is 7.2o . The 58 Plymouth should be the same.
Holden HK thru to WB have a KPI of 7.5o
Torana LC thru LJ have KPI of 7.5o
Falcon XA thru XG have KPI of 9.4o
The solution most go for is Holden stub axles with a P76 rotor. Adapter kits are still available but I don’t think the rotors are that common any more. These days it’s probably easier to get blank Holden rotors from DBA and have them drilled to Falcon stud pattern.
You also need to look at steering arms. From memory there are about 6 different lengths in the steering arms, with Toranas having the longest.
The last drama is the ball joints and tie rod ends. Use the originals and modify the stub axles to suit.
Falcon uses a ball joint pin taper of 1.2 inches per foot whilst Mopar uses a taper of 1.5 inches per foot. I don’t have any data on the Holden taper. Either way the easiest solution is to purchase a tapered reamer on line or from your local engineering firm and ream out the holes to suit the original ball joints.
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Temporarily suspended to cool off
Posts: 316
| and when it's all done, now the car is going to dive under breaking because you've deviated from the stock geometry so much the anti dive properties are gone.
disc brakes are not worth this, and they are not all they are cracked up to be.... drilled drums work amazingly well. |
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Extreme Veteran
Posts: 391
Location: Brisbane | Cheers Lozrox58. Hey Polybun do you know this for a fact? |
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Expert 5K+
Posts: 7498
Location: northern germany | Polybun - 2016-01-02 1:19 PM
drilled drums work amazingly well.
for what? to kill yourself? if drilled drums develop a large crack and that not unlikely, as the drums get hotter and are not stressed like disks, with a counteracting force, you are doomed. if a "forward" shoe (there are 6 of them in fl cars) gets wedged they wont release and block your wheel. but i agree, disks are not worth screwing up the original suspension geometry.
Edited by 1960fury 2016-01-02 7:20 PM
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Temporarily suspended to cool off
Posts: 316
| look it up for yourself, lots of people drill drums. Works fine. It's going to be no worse than drilled rotors. But wtf would I know? |
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Extreme Veteran
Posts: 310
Location: Newcastle Australia | disc brakes are not worth this, and they are not all they are cracked up to be.... drilled drums work amazingly well.
Drilled brake drums are not legal in any state of Australia.
And I believe not even on the race track.
and when it's all done, now the car is going to dive under breaking because you've deviated from the stock geometry so much the anti dive properties are gone.
The car should not dive under braking unless too much bump steer has been introduced. If the maths are done correctly (even trial and error for that matter) the car should perform better. It's possible on these old girls to obtain better castor for the radials tyres and better steering. Of course if it's botched up then you end up with a dog. |
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Expert 5K+
Posts: 7498
Location: northern germany | Polybun - 2016-01-02 8:02 PM
look it up for yourself, lots of people drill drums. Works fine. It's going to be no worse than drilled rotors. But wtf would I know?
for a good reason illegal almost everywhere and for the reason i explained above it is worse than drilled rotors. again, there is no counteracting force. the drums get hot and expanded by the brake shoes. its only a matter of time when they start to crack.
if you have a death wish, okay, but you are a danger to other people too, if a drum locks up. |
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Board Moderator & Exner Expert 10K+
Posts: 13066
Location: Southern Sweden - Sturkö island | Drilled drums was an old racing trick - at least all the cars were driven in the same direction with some extra safety measures at the tracks.
Using that outdated and very dangerous cowboy trick in normal road traffic is pure ignorance 
There's a reason that drilled drums are illegal.......................
Edited by wizard 2016-01-03 10:05 AM
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Temporarily suspended to cool off
Posts: 316
| No worse than riding on two wheels on the common roads. I'll take my chances on it. |
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Expert
Posts: 2480
Location: Dalveen, Queensland, Australia | Settle down...
If this was my project I'd be looking to fit discs to the original hubs and make up a caliper mount that bolts to the original upright, Falcon XY-early XB discs would be good, HQ calipers or Valiant VH-VK even.
I've done exactly this to a Hi-Ace, I see no reason why you can't to a Forward Look car. There are also people on the Moparmarket forum who'd done conversions to 8¾ rear ends and reckon they're easy using Falcon bits. |
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Expert 5K+
Posts: 8445
Location: Perth Australia | So does someone have an Australian parts list for doing disc brakes on these cars?
The brakes on my dodge arnt to bad just cruising around, but they are still single circuit (that I hate) and not so flash at high speed, hard braking (bit scary actually)
My favorite thing about drums though is no brake dust on the wheels 
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Extreme Veteran
Posts: 391
Location: Brisbane | I was hoping to get a parts list or even a conversion kit so i didnt have the car apart for to long. I thought a user called bonzadoggy was doing them |
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Expert 5K+
Posts: 8445
Location: Perth Australia | I hate re inventing the wheel
If it were really necessary to make up a brake system, I would, but I just think that someone must have done it before and know what parts can be used
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Expert
Posts: 1730
Location: Michigan | http://www.aajbrakes.com/
https://scarebird.com/index.php?route=common/home
Two companies that offer conversion kits.
With some pictures we might be able to help identify compatible parts that could be used. Without full knowledge of the differences between USA and Australia vehicle builds it's hard to say what would work.
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Regular
Posts: 94
Location: New Zealand | VJ valiant parts will work without too much effort as I posted above |
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Expert 5K+
Posts: 6552
Location: Newark, Texas (Fort Worth) | I put Scarebird on my 57 4 door. Uses 1994 or so dodge pickup calipers and 1972 ford Galaxie car 11.70" discs. Requires 15" wheels:
http://www.carid.com/1972-ford-galaxie-brake-parts/centric-c-tek-st...
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Elite Veteran
Posts: 982
Location: Upper Hunter NSW Australia | .........
Dan,
Either Hopper Stoppers
http://www.hoppers.com.au/
or Castlemaine Rod Shop ( now owned by Waddingtons )
http://www.rodshop.com.au/
Have done a disc conversion for our cars in the past ( can't remember if it was Hoppers or Castlemaine Rod Shop ).
I remember talking to them on the phone a few years back just after I first got my Dodge.
From memory it was around the $1200 area or so for the kit but can't remember what parts they used in the kit .......
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Elite Veteran
Posts: 982
Location: Upper Hunter NSW Australia | .......
Here's some blank undrilled P76 Leyland rotors that Laurie mentioned above.
http://www.ebay.com.au/itm/LEYLAND-P76-BLANK-BRAKE-DISC-ROTORS-HOT-...
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disk brake conversion
