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HQ-HG disc brake conversions
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marksg62 Offline
#1 Posted : Tuesday, 4 December 2007 9:22:15 PM(UTC)
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Would like to upgrade my HG discs to HQ mainly for stud change and more wheel choices,do the HQ stubs and brackets fit HG ?? whats envolved? Also would like to change rear brakes(Salisbury 10 bolt LSD)to discs also,or can I just change to HQ axles for the same stud pattern,any help or conversion shops location much appreciated.
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HK1837 Offline
#2 Posted : Tuesday, 4 December 2007 9:55:47 PM(UTC)
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HQ discs will bolt straight onto the HG stubs. As will HQ-WB calipers, but you have to swap them side to side so that the bleed nipples are at the top.
Rear is a bit harder, but all you have to do is get the axles redrilled to HQ pattern and use HQ-WB drums. Backing plates are the same.
You will be able to use the HG master cylinder, and check you have the same size rear wheel cylinders as HQ.
One other thought though - rather than waste money "defacing" an original HK-HG 10-bolt, sell it (for around $1500) and get a 9" built up with HQ stud pattern and brakes.

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HK1837 Offline
#3 Posted : Tuesday, 4 December 2007 9:55:47 PM(UTC)
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HQ discs will bolt straight onto the HG stubs. As will HQ-WB calipers, but you have to swap them side to side so that the bleed nipples are at the top.
Rear is a bit harder, but all you have to do is get the axles redrilled to HQ pattern and use HQ-WB dr
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marksg62 Offline
#4 Posted : Wednesday, 5 December 2007 3:14:09 AM(UTC)
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Thanks Byron,good to know honest help is still common,good to be apart of the Old Holden neighborhood,will stick with the 10 bolt,it still seems wrong to add Ford parts to a Holden!! Cheers
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marksg62 Offline
#5 Posted : Wednesday, 5 December 2007 3:14:09 AM(UTC)
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Thanks Byron,good to know honest help is still common,good to be apart of the Old Holden neighborhood,will stick with the 10 bolt,it still seems wrong to add Ford parts to a Holden!! Cheers
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HK1837 Offline
#6 Posted : Wednesday, 5 December 2007 5:58:27 AM(UTC)
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The other thing you might want to consider is a VL V8 Borg Warner or VB to VK 10-bolt. With these you get discs on the back so its a bit more work. And you still have the wrong stud pattern.

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HK1837 Offline
#7 Posted : Wednesday, 5 December 2007 5:58:27 AM(UTC)
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The other thing you might want to consider is a VL V8 Borg Warner or VB to VK 10-bolt. With these you get discs on the back so it's a bit more work. And you still have the wrong stud pattern.

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ht81469 Offline
#8 Posted : Monday, 18 January 2010 11:22:49 AM(UTC)
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I think my question has already been answered by HK1837 but I would like to be sure. First to explain my planned set-up... I plan to fit HQ rotors and HQ PBR callipers on a HT Brougham fitted with CRS drop stub axles. The rotors were blank DBA and have been drilled to HT pattern (as I have just learnt, to be able to fit standard rims the rotor centre will need to be reduced). The standard HT master cylinder and booster should be suitable as confirmed by HK1837 and Hoppers Stoppers. Regarding the rear wheel cylinders... HT with disc/drum use 9/16" rear wheel cylinders. HQ with disc/drum use larger 7/8" rear wheel cylinders, plus I believe they also use a proportioning valve located half way along the chassis (ensuring front brakes lock before the rear). From reply by HK1837 I should be using the 7/8" rear wheel cylinders when using the HQ callipers, correct? Since this will be almost same set-up as standard HQ, will the proportioning valve be required?
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Nicho71TPI Offline
#9 Posted : Tuesday, 19 January 2010 7:35:48 AM(UTC)
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Gday Mark
I have a HG ute with a Salisbury (10 bolt LSD) and have had it converted to disc brakes. I did, sorry the mechanic did, got new axles made up to use Commodore calipers and rotors. The new axles are thicker in diameter and therefore stronger. And you know the history and know they havent been flogged to death.
You do also have to fit a proportioning valve as well. Certain models that had factory all wheel disc brakes can be utilised for sourcing a master cylinder with a proportioning valve.
If you do the conversion you have to be aware to keep the original factory track other wise you will have to allow for the difference, either adding or subtracting the difference with either spacers(dodgy) or trying to find a set of wheels with the right dish or a custom made set of wheels. More money!
For this measure and record everything! Wheel to wheel, drum to drum, inside and outside.
A company in South East Queensland made these up for my mechanic and from memory it cost around $800 for the two axles. Then count in the cost of the Commodore calipers, rotors(I used slotted items), pads, brake line, handbrake cables(can be sourced from the wreckers) and reco kits. I think it all came in under $1000.
If you want to, email me and I can pass on to you my mechanics info, he is also in South East Queenslandand, he can get you pointed in the right direction.
I am not keen on doing the ford bits into a Holden idea either and if its just going to be a neat streeter, then you dont need a 9 inch that will stand big horsepower or that will drain power from a motor that doesnt do 10 second quarters.

Cheers,

Nicho
Iam a fuel injected suicide machine!

Edited by user Tuesday, 19 January 2010 7:41:01 AM(UTC)  | Reason: Not specified

Iam a fuel injected suicide machine!
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martycassie Offline
#10 Posted : Thursday, 9 December 2010 5:40:04 PM(UTC)
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I have a similar problem, I have a WB tonner, with a 350 Chev. I wacked a disc Staesmen rear end in, all good after I changed the master cyl to 4 disc (HZ Statesmen) & removed the BP Valve. No worries except the bloody handbrake mechanism on the calipers hit the leaf springs. I Don't want to put lowering blocks in as I lose my clearence for carrying. I tried to modify them, but I cocked it up. Also I had to change the yoke on the diff & have now been told it's not good as it screws up the balance? I do have a small vibration at speed but that could be the tailshaft bent when the 6 cylinder diff snapped & the shaft smashed around for a few secs, any ideas?, cheers, Marty.PS has anyone fitted a after market A/C unit to a 350 Chev, any photos of the compressor mount location??
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Dr Terry Offline
#11 Posted : Thursday, 9 December 2010 5:50:06 PM(UTC)
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quote:
Originally posted by ht81469
Regarding the rear wheel cylinders... HT with disc/drum use 9/16" rear wheel cylinders. HQ with disc/drum use larger 7/8" rear wheel cylinders, plus I believe they also use a proportioning valve located half way along the chassis (ensuring front brakes lock before the rear). From reply by HK1837 I should be using the 7/8" rear wheel cylinders when using the HQ callipers, correct? Since this will be almost same set-up as standard HQ, will the proportioning valve be required?

If you are staying with rear drum brakes, the HK/T/G set-up of 9/16" wheel cylinders & no proportioning valve works fine & is simpler. I've fitted many sets of HQ front discs to HK/T/G & I find its the best way to go.

Dr Terry.

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martycassie Offline
#12 Posted : Saturday, 11 December 2010 5:55:39 AM(UTC)
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G'day has anyone put an after market A/C unit in their HZ - WB, if so any tips on compressor, photos would be great, cheers, Marty.
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HK1837 Offline
#13 Posted : Saturday, 11 December 2010 5:57:06 PM(UTC)
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Most people just fit factory units, as they look heaps better in the cabin as everything is hidden.

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If we all had the same (good) taste, who would buy all the Fords?
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jim Offline
#14 Posted : Saturday, 11 December 2010 6:22:24 PM(UTC)
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martycassie ,you may want to start another thread as this one is about brakes and ,more will
answer you if the title is about"air con".

Jim in Adelaide..
Jim in Adelaide..
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martycassie Offline
#15 Posted : Sunday, 12 December 2010 5:53:11 PM(UTC)
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Good idea, M
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martycassie Offline
#16 Posted : Monday, 20 December 2010 8:40:58 PM(UTC)
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G'day all, I still haven't sussed out the handbrake on my WB tonner withy a HZ Statey disc rear end. The hand brake mechanism on the calipers fouls on the leaf springs. I've asked heaps of "experts" & no one knows the answer, so if you do you'll be a legend, cheers, Marty
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bullitljv8 Offline
#17 Posted : Tuesday, 21 December 2010 3:05:08 AM(UTC)
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quote:
Originally posted by HK1837
HQ discs will bolt straight onto the HG stubs. As will HQ-WB calipers, but you have to swap them side to side so that the bleed nipples are at the top.
Rear is a bit harder, but all you have to do is get the axles redrilled to HQ pattern and use HQ-WB drums. Backing plates are the same.
You will be able to use the HG master cylinder, and check you have the same size rear wheel cylinders as HQ.
One other thought though - rather than waste money "defacing" an original HK-HG 10-bolt, sell it (for around $1500) and get a 9" built up with HQ stud pattern and brakes.

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If we all had the same (good) taste, who would buy all the Fords?


hey byron what about lx torana if you want to go hq pattern is it the same there???
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states_man Offline
#18 Posted : Wednesday, 22 December 2010 6:12:10 AM(UTC)
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pretty sure that you need to swap the calipers from side to side for leaf springs to get clearance. this puts the handbrake cable at the top instead of the bottom and you may need custom handbrake cables. you could ask on oldholden.com, might be some more answers on there, also lots of good info on aussiev8.com
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martycassie Offline
#19 Posted : Thursday, 23 December 2010 6:36:38 AM(UTC)
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Sweet, thanks man, Marty
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HK1837 Offline
#20 Posted : Thursday, 23 December 2010 7:07:32 AM(UTC)
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quote:
Originally posted by bullitljv8
quote:
Originally posted by HK1837
HQ discs will bolt straight onto the HG stubs. As will HQ-WB calipers, but you have to swap them side to side so that the bleed nipples are at the top.
Rear is a bit harder, but all you have to do is get the axles redrilled to HQ pattern and use HQ-WB drums. Backing plates are the same.
You will be able to use the HG master cylinder, and check you have the same size rear wheel cylinders as HQ.
One other thought though - rather than waste money "defacing" an original HK-HG 10-bolt, sell it (for around $1500) and get a 9" built up with HQ stud pattern and brakes.

_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?


hey byron what about lx torana if you want to go hq pattern is it the same there???


No, you have to use the HK-WB stubs with HQ-WB discs on LH-UC.

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If we all had the same (good) taste, who would buy all the Fords?
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If we all had the same (good) taste, who would buy all the Fords?
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