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Old 06-22-2018, 06:03 PM
AUSTJ4000 AUSTJ4000 is offline
232 I6
 
Join Date: Jul 30, 2015
Location: Australia
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72 J series Brake booster

G'day from Australia , My J4700 has 4wheel 12" Drums that I am rebuilding (to expensive to do a disc conversion here). It has a PBR brake booster on it around 7" diameter which I was going to try and replace with a newer unit; Are the Jeep boosters based on GM design or Ford of that era? or what common booster will fit?
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  #2  
Old 06-24-2018, 10:36 PM
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FSJunkie FSJunkie is offline
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The booster is very similar to the boosters used on AMC cars from the late 1960s. They are Bendix boosters, which were sometimes also used by Ford. A 1960s Ford booster may be one option.

Or you can convert to manual brakes. When properly done, they don't take a terrible amount more pedal force than power brakes. One less thing to fail in the future.
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Old 06-26-2018, 04:26 AM
AUSTJ4000 AUSTJ4000 is offline
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Thanks for your help; The booster on it is a PBR which I believe has been put on locally, just another mystery I suppose. I think the clutch master cylinder is from an early Ford maybe Galaxie? As there weren't to many parts available here I think it's a bit of a Frankenstein Jeep
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Old 06-26-2018, 05:37 AM
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Heavy_Metal_Thunder_81 Heavy_Metal_Thunder_81 is offline
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Quote:
Originally Posted by AUSTJ4000
Thanks for your help; The booster on it is a PBR which I believe has been put on locally, just another mystery I suppose. I think the clutch master cylinder is from an early Ford maybe Galaxie? As there weren't to many parts available here I think it's a bit of a Frankenstein Jeep
Considering FSJs never came with hydraulic clutches I'd say that's a safe bet lol
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Old 06-26-2018, 09:15 AM
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tgreese tgreese is offline
 
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IIRC the 230 era ('62-65) used a hydraulic clutch. None since then. The OP could compare his config to one of these early models - it might have been carried over for RHD models.

For the brake booster, I would look to the hot rod world for a universal booster that could be adapted to your Jeep. No personal experience, but sites like Wilwood may have some good info on this topic. https://www.wilwood.com/index If I were making the effort to upgrade, and the vehicle had power steering, I would look into a hydroboost upgrade. In the USA, the Chevy Astro Van is a common donor - your local hot rodders may know more about the best donor in Oz.

hth!
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
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Last edited by tgreese : 06-26-2018 at 09:28 AM.
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  #6  
Old 06-27-2018, 09:07 PM
AUSTJ4000 AUSTJ4000 is offline
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Thanks for all the information fellas, I'm on the fence about upgrading to front Disc brakes with a conversion from BJ's. I looked into it a couple of years ago but the price for freight at $500 USD gave me a fright! If I changed to this I would have a bigger choice of master cylinder's and boosters and I'd have a spare pair of 12"inch brake drums as they're impossible to get in Australia.
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Old 06-28-2018, 09:14 AM
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tgreese tgreese is offline
 
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Quote:
Originally Posted by AUSTJ4000
Thanks for all the information fellas, I'm on the fence about upgrading to front Disc brakes with a conversion from BJ's. I looked into it a couple of years ago but the price for freight at $500 USD gave me a fright! If I changed to this I would have a bigger choice of master cylinder's and boosters and I'd have a spare pair of 12"inch brake drums as they're impossible to get in Australia.
The 12" drums are unobtainium in the USA too. All gone. Supposedly some Land Rovers used the same drum for a while ... that may be a richer resource in Oz than here in NA.

All the closed knuckle Jeep front axles are the same in terms of disk brake conversion. Geo Tracker / Sidekick brakes are sometimes used for conversion. http://www.earlycj5.com/xf_cj5/index...y-cj5s.129871/ If you thought these were too small for the front axle, I'm sure they would be fine for the rear. Pretty sure the 11" Jeep drum brakes can replace the 12" as well, and these would be plenty of braking for a rear axle. The Jeep 11"x2" drum brakes are Bendix, and were used on millions of vehicles, including Ford pickups and Broncos - drums (and all the service parts) for these are widely available and cheap.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk
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  #8  
Old 06-29-2018, 06:02 AM
AUSTJ4000 AUSTJ4000 is offline
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Thanks Tim, that was an interesting read; I always thought the Suzuki brakes were the same setup as Daihatsu F20 etc. I had a look on eBay and found some of the Suzuki's had vented discs here also. We call the goetracker a Vitara here, just the same as what's here except they put the steering wheel on the wrong side there 😉
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