View Full Version : Brakes for an LC Torana RB30E - master cyl/booster woes
Working on an LC Torana that has front disc brakes. As far as I know they were all drum fronts, so I'm assuming it's a conversion of some sort. Now, there's a booster and a dual circuit master cylinder from what I can tell.. and it's all in the way.
it was fine with the 202, but am putting in an RB30E and it fouls terribly (read: even with the manifolds off the brake system almost touches the engine).
I don't want to "downgrade" the brakes to drums again, so I'm leaving the discs on the front. If anyone has a suggestion for something that mounts to the firewall (the existing setup is about 6" + from the firewall) that would be great.
This isn't a terribly uncommon conversion, surely someone knows?
My father has put the RB30 in his LJ. He's redrilled the holes on that bracket that the booster bolts onto so that it can be mounted on an angle to clear the manifold. I think its a Kinga booster and master cylinder setup, but I can ask him to find out for sure if you like.
Below is a link to a photo of the engine bay, although you can see pretty much nothing of the bracket setup :(
If you want more info about how he went about it, I can call him.
http://homepages.picknowl.com.au/walbk001/torana engine ii.jpg
12-05-02, 04:03 PM
The LC GTR-XU1 had disc brake front end.
Stated in Ellerys Workshop Manual....
Brakes: Type - Four wheel hydraulic with dual master cylinder to
provide seperate hydraulic systems to front and rear
brakes, with 'tandem booster' power assistance.
Front: 10.0 dia. x .620" thick discs
Rear: 9.0 dia. x 1.75" wide drums
Master Cylinder: 1.0 dia. x 1.215" stroke
Calliper cylinder bore: 2.125"
Rear Wheel Cyl: 0.563"
Sounds from your description that you have a set up similar to this??
Once again, use the forums on this site... http://www.gmh-torana.com There is a bloke who frequents these forums called Alan Kirk, who built the white LC that was in the Top 10 last year (goes under the name Top_10_torana)
I think he utilised a Toyota Landcruiser master cylinder and has it hidden under the dash. He has his there for cosmetic reasons.... but im sure the same could be applied in your case to get it out of the way :)
Thanks guys, keep it coming.,
The picture posted by goose seems to have exactly the same master cylinder as my brother's car (it's my project, but it's his car!), and the booster looks the same too. Certainly sits on a different bracket though! The bracket on our car looks very factory.
Does anyone have a picture of a stock Kingswood hydraulic setup? The master cylinder is certainly dual circuit, and now that I've disconnected the brake lines, it's definitely a front/rear split and not a diagonal split (I had thought that dual circuit systems were supposed to be diagonal split?)
Also, the LC only has 13" wheels and the brakes fit under them, so I'm going to assume they're faiurly small. In a horrible twist, the car came with locknuts on the wheels, so uh *reddens* we can't get the wheels off just at the minute. :(
My commodore has front/rear split. Dad's ED falcon has diagonal split. Maybe its only newer cars with diagonal split.
I was pretty sure that the bracket Dad has is the proper LJ bracket. Maybe its not. Perhaps its the XU1 bracket.
The XU1 booster has no chance of fitting on. Dad's got the whole setup at home (double diaphragm), and didn't use it for that reason.
Even the XU1 discs are not ventilated. (I'm pretty sure). I was under the impression they are exactly the same as the HG(??) monaro brakes.
12-05-02, 09:48 PM
i have this picture of my booster/master cyl, aint the best angle though
Click Me (http://www.public.rts.com.au/~poulose/mycar/pics/engine_front.jpg)
Champion. That appears to be exactly the setup we have, right down the the reservoir line.
You could use a remote booster and mount the m/cyl directly to the firewall using an adapter that i think CRS make.
13-05-02, 09:14 AM
I'm running a remote booster on my EH for the front discs and its hidden under the front guard out of the engine bay all together. I'm not sure how much room you will have under the guards in an LC?
Originally posted by HighLife
I'm not sure how much room you will have under the guards in an LC?
A remote booster will fit under the front right hand guard of an LC.
Mount the master cylinder directly to the fire wall.
Heres some info I got from Dad last night.
xu1 discs 15mm thick standard discs are only 12mm (neither are ventilated)
regency [Regency Park for SA, where the car has to be inspected] happy with xu1 discs
brake booster bracket where bolted to booster has been cut and moved around 1/8 of a turn and rewelded so the bracket is on a 45degree angle at firewall so 2 new bolt holes have to drilled in firewall leaving the brake rod in its original position(as advised by adelaide rod shop). brake lines need to be reshaped. you need an standard booster not lj xu1 (as it is a double diaphragm and too long) mud guard needs to be recessed about an inch and shaped to allow for booster.
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