720 electric brake booster + MC upgrade

[bratsun]

I upgraded my trucks brake system to modern times with a tesla ibooster.  

 

 

no more vacuum assisted brakes! 

 

now have strong and consistent brake pedal feel

 

full write up/how to here: https://bratindustries.net/electric-brake-assist-for-the-electric-datsun-720/

 

Whats a electric brake booster?

 

It’s an electric motor that helps your foot push the brake pedal.

 

simple. 

 

they are in everything these days, ICE vehicles (being most are now direct injection) and EV's.

 

the most common one used is made by bosch, called the Ibooster.

 

 

The one i used is from a tesla model y, and has a dual port 1" bore master cylinder. A nice increases from the 14/15" MC on the 720. This plus with the additional assist power from the ibooster makes for stronger brakes effect. My truck now stops on a dime!

 

The tesla model y one also has a fluid reservoir that dosnt tilt down, so it works as is. The model 3 one has a funny shape and wont work very well.

 

Iboosters from different vehicles have different MC and fluid reservoirs. but the ibooster itself is the same. bolt pattern might be different.

 

 

Install:

 

To adapted the brake lines to the tesla MC i used  M10x1.0 inverter x M12x1.0 bubble brake line adapters

 

To mount the ibooster I made a new mounting bracket, and used a M10 male to M8 female coupling for the original pedal clevis to thread into the ibooster push rod. 

 

 

 

 

I still have the stock rear drums, so i needed to add a 10lbs residual valve on the rear line as the ibooster MC dose not have one built in like the 720 MC.

 

wiring is simple. permanent 12v lines (40amp fused) and a wire connected to the trucks ignition circuit via a 5amp fuse (this wakes the ibooster up).

 

• 1 = 12V+ permanent 40A fused
• 9 = GND
• 20 = 12V+ ignition 5A fused

 

thats it!

 

powerful, consistent, vacuum less brakes 🙂