Bronco brake booster link in an FJ40

[Rigger]

I searched - can't find anything.

If you install a booster and a two circuit master cylinder into your early FJ40 with stock motor, the master cylinder sort of bangs into the carburetor. There's a few different things you can do to resolve the matter, including moving the pedal bucket over an inch or so, or removing that little part off of the carburetor.

I'm opening this thread to see if anyone has thought of, or tried this solution:

The older Ford Broncos have a bracket and linkage mechanism that in effect turns the booster and master cylinder outboard by about 10 or 15 degrees. Here are a few photos that show it.

Anyone tried this? I wonder if this would be a workable solution to add a boosted master to an FJ40.

 

[Michael B]

I think it will be difficult to straddle the firewall rib with that mounting bracket.

 

[Chris Wilcox]

I custom made something just like that to fit a booster in an Austin Mini. You also don't have to make the link lengths equal. So I'd say, with a custom linkage, anything is possible. Another interesting possibility is hydroboost.

 

[Rigger]

I think it will be difficult to straddle the firewall rib with that mounting bracket.

Understood. Maybe what I should have asked is has anyone tried this concept, if not these exact parts. I was thinking that a Bronco linkage could be modified to fit around the FJ40 firewall rib.

When I did my FJ40 disc brake conversion, it never occurred to me to use a linkage to turn the whole mess away from the carb.

 

[Michael B]

I haven't seen anyone make the modifications you are discribing yet. I have seen the rib moved and a 40 or 60 series booster and MC installed.

 

[mtrdud]

I had a 73 EB and used that bracket. It worked well but I've never tried it on a 40.

 

[White Stripe]

You can use a smaller booster out of various other toyota models. I used a fj60 booster, and I am not even close to having any clearance issues. I have 4wheel discs and it brakes really well.

I searched - can't find anything.

If you install a booster and a two circuit master cylinder into your early FJ40 with stock motor, the master cylinder sort of bangs into the carburetor. There's a few different things you can do to resolve the matter, including moving the pedal bucket over an inch or so, or removing that little part off of the carburetor.

I'm opening this thread to see if anyone has thought of, or tried this solution:

The older Ford Broncos have a bracket and linkage mechanism that in effect turns the booster and master cylinder outboard by about 10 or 15 degrees. Here are a few photos that show it.

Anyone tried this? I wonder if this would be a workable solution to add a boosted master to an FJ40.

View attachment 1333734 View attachment 1333735

 

[sadam_husain]

as above there are s***loads of 40 series cruisers out there with boostered master cylinders that don't hit the carb so it cant be hard to find an easy solution to work for your truck

 

[Racer65]

I mentioned this elsewhere. You can use a combination of the City Racer booster and a FZJ80 master cylinder to get the inches you need for clearance.

 

[phillyFJ40]

Are we talking about a pre late-1970 FJ40 that didn't have a booster to begin with? Or FJ40 that had a booster?

 

[69LC]

If you install a booster and a two circuit master cylinder into your

- early FJ40 -

with stock motor,...

Based on this I would guess its a pre-brake booster tub with a completely vertical firewall rib.

 

[Rigger]

Yes; I was referring to the 40's that came stock with no booster.

 

[Rigger]

as above there are s***loads of 40 series cruisers out there with boostered master cylinders that don't hit the carb so it cant be hard to find an easy solution to work for your truck

I'll have to do some more searching. My combo of adapter/spacer, booster & MC came waaaay out near the carb.

 

[darwink1]

I managed to fit a longish 2 circuit master and a 97 fzj80 booster in my 40 without even coming close to the carb. The 80 booster is a pretty big unit and it comes close to the clutch master but clears with a 3/4" spacer between the firewall and booster. Obviously, I had to modify the firewall rib in a couple spots. This is with a 2f and trollhole carb if it makes a difference.

Post a pic of your set up as im curious about this spacer you used and why it kicks s*** out so far.

D

 

[ferg]

When I disc'd mine I used a mini truck booster and master. Trimmed the vertical brace and never had any issues.

 

[bikersmurf]

I've posted pics in my thread... An 80 series booster is several inches shorter.

How much length do you need to loose?

 

[DomSmith]

Rigger-

Not sure if you solved this but I’m about to tackle what you posted originally. I’ve got a 65 FJ45 that I made a spacer to clear the firewall rib to use a small geo metro booster for 4 wheel discs.

5 years later I’m replacing the old F135 with a 3FE and have major plenum clearance issues. Here’s my solution based on the EB concept. This is a rough draft for the final product. The pivot point will obviously be between the top and bottom plate.

Just waiting for my buddies waterjet machine to become available to start cutting parts.

I’ll let you know how it turns out.

 

[RockDoc]

Did this go ahead @DomSmith ? I'm about to give it a try in a '70 FJ55 / 2FE project, would love to hear how it worked for you.

 

[DomSmith]

RockDoc-

I just finished it this week and actually mounted the booster and bled the brakes yesterday. I’ll attach a few pics but the process is buried in this thread along with other aspects of this FJ45 project. The booster bracket starts on post #499...

Just had to treat myself for Halloween... 65 SWB

The truck is not running yet so I can’t report on how well it works but there’s good firm pedal pressure like before. I may need to make an adjustment as the angle of the pushrod into the booster isn’t quite as straight as I’d like.

 

[DomSmith]

Some pics for those who don’t want to read through all the other aspects in the other thread...


I ended up just cutting up metal plate instead of waterjetting. The firewall side and booster side were taken from the previous spacer...


Initial mock up...

Closer to final...

Pivot...

Final product...

I’m happy to post up more pics if anyone is interested. Or maybe I’ll do a new thread specific to the process.