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hr brakes in ej

I need to know if the HR brake booster goes sraight in on the firewall of an EJ. I have an EJ with a 202 but it still has drum brakes. I do however have a set of beaut Hz front stub axles and rear diff with drums. Should I

a)keep rear drums from the ej and put on the hz stub axles with rotors on front. But what about the pressure difference?

b)Maybe fit both HZ rotors and rear diff and perhaps HZ booster and valve. Will they fit?

c)keep to the HR rotors and stub axles and fit up the rear drums or wheel cylinders or put a dfferent pressure valve in?

Any info on these questions will be praised and hailled.

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Comments

itl work choice b
fit right on mate
go for it itll work trust me

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I really don't think a HZ diff will fit under the EJ without going overtrack and being totally illegal (I can feel a 'canary' coming on!). What you're better off doing is keeping the stock rear, drop the wheel cylinders down to 9/16 inch bore (ie HR factory front disc rear wheel cylinders), fitting Torana discs and calipers (thus keeping the same stud pattern on all 4 wheels). The HR booster is a remote booster (not mounted on the firewall, ie a VH40), the first firewall mounted ones were the HK onwards.

Hope this helps

Peter

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HI
if youre worried about wheel track?
try 4cyl commie discs will give you about 14mm less track
and lj rear ends about 70mm less track.
Ive fitted a mazda twin resi master cyl looks and works great
Cheers hemi

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the problem with mixing up hz brake parts with EJ is the wheel stud pattern changes & you'll need to run the 14" rims which have a different offset or a different track. this in effect causes the car to become unroadworthy, so measure up your wheel offsets to check this & then measure the track difference of the mounted hz hub. obviously without having knowledge from someone who has done this, it will be trial & error unfortunately.
if you want to use the hz brakes & the wheels will work, or you get aftermarket wheels that will, by using all the hz brake parts for the front should be fine. but also using a proportioning valve should set things up with the appropriate pressures. you will have to use the hz dual master cylinder for this setup at least so that you have the front & back on seperate systems from there.
i would advise against the previous idea of using 4 cylinder commodore discs as they are pointless when fighting against a 6 cylinder car, as well as illegal. you must use a brake system compatible for your motor or better.
i only run a 149 in my EJ but am using standard HR discs on the front so i can use the 13" HR disc brake wheels & keep the EJ hubcaps for the original look of my car(see my shed gallery). I use a single brake cylinder & the nasco remote booster with standard rear drums on the standard diff.
In my ute with the 350 i'm running vt floating hub commodore discs all round with a remote booster & dual master cylinder but it is very modified & i wouldn't recommend this unless you have a magical replenishing wallet.
Another alternative i have been thinking about for my EJ is to put the volvo lsd centred diff on the rear of the wagon which is almost a bolt in item & they are cheap too. do a search of this site for this info or look back through the EH posts to find the guys who have done it & explain it. this diff with perhaps redrilled HZ/HQ front discs to keep the original stud pattern & therefore keep the 13" rims would be ideal in my mind.
good luck, let us know what you end up doing

'63'64 great years 4 a 2 door

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4cyl commie discs are the same as LH/LX discs,
except the inner bearing carrier is about 5/7mm
resest more.
This adds up to about 14mm, a lot if youre chassing
wheel track.
Ive had these on my car for 7 years with no trouble,
192 4bbl YT head etc.

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To anyone,
I have fitted HQ discs and callipers to the front of my EH.I want to fit a disc rear end as well but have not decided on what kind.I want a gear ratio of 3.7:1 to 3.9:1.I've read that you can use commodore diffs.Are VL-VR all the same?Do these diffs come in the ratio's that i want?I heard that volvo diffs are also an option and i know that they have the right ratio.Can i fit the volvo centre into the commodore housing using shortened and resplined commodore axles.Also what master cylinder do i need to use.The car is manual,the clutch master cylinder on the firewall creates a problem with fitting a HZ-WB style master cylinder because of a lack of room.Any help on this matter would be muchly appreciated.
You can e-mail me directly at marccarla@dodo.com.au

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