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brake booster alternatives

rockota

white collar hillbilly
Joined
May 28, 2020
Member Number
1642
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3,945
carry over from a thread in the Toyota section.

Vacuum boost, hydroboost - both common enough.

I'm looing for an electric boost option. I've torn apart a 2002 toyota 4runner MC, but there's no way to make it w/o without it's integrated ABS ECU. So I'm looking at alternatives.

ideally - electric booster that can accept a "standard" 2-bolt MC, very small packaging, no reliance on ABS/ABS ECU to work.

Any ideas?
 
I don’t have any ideas for you but lots of interesting tech and ideas in the other thread. You should link it here so others can find it at a later date.
 
I'd like some options for brake boosters and would like to see what you come up with in this thread. Gutted my booster because of size, went manual and have been trying to find something else. Boosters are huge/require vacuum, manual brakes suck at best, and hydro boost is more than I currently want to get into. I was even going to see if someone made mini universal boosters of some sort, never got that far.

Either way sub'd
 
Dad has that speedway setup under the floor of his 32 model A with a cobra drivetrain. It’s not up and running yet but it’s a very nice setup. As said above, not cheap though.
 
Do you have room to operate it off of a bell crank and put booster and master at 90 degrees to firewall?
 
Do you have room to operate it off of a bell crank and put booster and master at 90 degrees to firewall?

Nope. Space is at a premium. Not much room in the Tacoma engine bay after sticking shock mounts, arb compressor, aux wiring, supercharger, etc etc.

That’s kind of what prompted the initial inquiry
 
I don't have any photos BUT i have seen people aka desert trucks keep the boost in stock place and make a long sometimes bent pushrod from the booster to the master cylinder mounted up near core support and have the new push rod slide inside a couple bronze or delrin bushings and have a spring attached to it to help it return.
 
What are ecoboost trucks doing for Power steering since I heard they don't have a PS pump. I wonder if you could find a cheap hydraulic/power steering pump to run a hydroboost to not have it tied into the engine in any way.

Like this one here. https://www.corral.net/threads/volvo...te-up.2499503/

If someone knows about this I'm contemplating this for my prerunner build that's going to run hydroboost and mounting that cantilever under the hood would make things much easier and less hoses to run from the motor.

Here's one on ebay if someone wants to try it out. ALSO i have a hydroboost form an 02 Escalade that i will sell if someone wants to try this out.
 
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What are ecoboost trucks doing for Power steering since I heard they don't have a PS pump. I wonder if you could find a cheap hydraulic/power steering pump to run a hydroboost to not have it tied into the engine in any way.

Like this one here. https://www.corral.net/threads/volvo...te-up.2499503/

If someone knows about this I'm contemplating this for my prerunner build that's going to run hydroboost and mounting that cantilever under the hood would make things much easier and less hoses to run from the motor.

Here's one on ebay if someone wants to try it out. ALSO i have a hydroboost form an 02 Escalade that i will sell if someone wants to try this out.

It's most likey an electric rack, basically replace the hydraulic servo with an electric motor. I assume the booster is still vacuum. I can look at the wife's '15 later, but you know newer vehicles are packaged :laughing:
 
It's most likey an electric rack, basically replace the hydraulic servo with an electric motor. I assume the booster is still vacuum. I can look at the wife's '15 later, but you know newer vehicles are packaged :laughing:

Yeah I know some guys with ecoboost offroad trucks want to bitch the rack for steering box and one truck they had to make a steering pump bracket to do that since it was an electric rack
 
Also what i have seen a few guys do is mount a manual master cylinder to power a slave cylinder that pushed a remote mounted booster. Then you have one line to slave cylinder which pushes on the brake booster like the rod attached to your brake pedal would do.
 
Mr2 or other electric power steering pump to run hydro boost?
 
Also what i have seen a few guys do is mount a manual master cylinder to power a slave cylinder that pushed a remote mounted booster. Then you have one line to slave cylinder which pushes on the brake booster like the rod attached to your brake pedal would do.

that seems like an excessive amount of work?
 
Mr2 or other electric power steering pump to run hydro boost?

hydroboost is an option, but I'm not sure anything is to be benefitted from adding complexity to that system?
 
hydroboost is an option, but I'm not sure anything is to be benefitted from adding complexity to that system?

Only benefit would be seperate from steering. If that is a benefit.
 
Back in the late 80s the OEMs tried electric brake boosters. "Teves MK 2" is what you want to google. It was an allegedly unreliable system. The accumulator is where most of the problems are. You can't get new accumulators but you can cobble together fittings to adapt one off a newer booster. These mostly came on luxury cars (Jaguars, high trim Buicks, etc) and are expensive. These units have a bad rap but that's mostly a reflection of the mechanical ability of the kind of people who were tinkering with these cars 10-20yr ago when most of the tech on them was written.

The tech finally matured around 2010ish and OEMs started putting electric boosters in all sorts of vehicle, mostly hybrid applications where you might need to press the brake dozens of times without the motor running to replenish vacuum. I don't know much about these other than they all plug into CANBUS but considering that they're part of the brake system I bet they can be run in some sort of dumb limp mode (imagine the lawsuits if power brakes didn't work because a rat chewed a canbus wire).

I think the aftermarket setups are overpriced for what they are. I'd look into a junkyard/used parts solution.
that seems like an excessive amount of work?

Lots of vehicles (mostly 3/4-ton and lager trucks) were set up that way from the factory circa 1950.
 
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The new Jeep JL and JTs run electric power steering pumps
 
vacuum boosters still an option? There are smaller ones, with dual diaphragm to make up the surface area. Bonus, typically they give more power assist than a single diaphragm will.

I wasn't aware of a dual diaphragm booster, I still have vacuum but lack of space. Anyone know if that is as small as they get? I'd be willing to spend a little more to get as small as I could. Considering the price on that unit isn't all that unreasonable.
 
One benefit to the electric boosters is that the boost will be substantially higher...
 
What about the electric booster from say a 90s International 4600 with that electric/hydraulic brakes?

(Think of the dooty cycles)
 
I'm pretty sure Provience looked into that once upon a time and IIRC electric portion is just a backup and doesn't have the dooty cycles for normal use.

That was the case.

anything electric over hydraulic that is older is going to have silly big amps as well. any of the new stuff should be much smaller to give you less boost and work with fewer electricities
 
Also what i have seen a few guys do is mount a manual master cylinder to power a slave cylinder that pushed a remote mounted booster. Then you have one line to slave cylinder which pushes on the brake booster like the rod attached to your brake pedal would do.

it's something I will look into if I have zero room to work with, with just enough room for a small master cylinder....

file-14_e5e167d8-7a14-415c-8d76-35eb7cff2d6c_500x.jpg?v=1592624794.jpg

https://bustedknuckleoffroad.com/products/remote-mount-hydroboost-brake-kit
 
I'm pretty sure Provience looked into that once upon a time and IIRC electric portion is just a backup and doesn't have the dooty cycles for normal use.


That was the case.

anything electric over hydraulic that is older is going to have silly big amps as well. any of the new stuff should be much smaller to give you less boost and work with fewer electricities

Backup? The electric booster in our 4600 is almost constantly running?

I agree that its got to be power hungry
 
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