Just curious if anyone has replaced the electronic brake pressure pump system with a good old-fashioned vacuum-powered brake booster. Personally I don't trust the electronic gadgets, especially when they're in charge of the thing that makes the vehicle slow down.
That is a very intersting idea. You would scrap the ABS and ABS computer but otherwise I don't see why a conversion from another vehicle with appropriate MC piston diameter and stroke couldn't work.
On the other hand if you don't like to rely on electronics you really need to stay clear of the 100.
You have to please the computer to start and drive it anyway. You still have the old mechanical emergency brake system (thats what I need to fix next I guess) as a back up.
I'm thinking this conversion would be nice for trail driven rigs after the booster pump fails. Bet it would be more like $400 in parts for an old vac unit.
Nice thread. I have also thought about this. My question is: Did they really put that on the low tech 100s and 105s sold? Is there not another Toyota spec'd MC that will do the work? How different is the 80 series MC or the Tundra or earlier T-100, etc.
Personally, I like the Bendix MC that uses power steering pressure but has a 12V electric backup.
It shows up under the hood of anything 3-ton and up with hydraulic brakes. F-700, Topkick, Motorhomes, etc. GM probably did it to cars at various points in their diesel days.
Don't think so as the pump is what runs the breaks, i.e. the pressure comes from the pump not the master cylinder piston as in an old conventional system. That plus all the valving is integral to the MC.
I think the best avenue is to look at 'other market' 100's and 105's for alternatives.
There is standard M/C and vacuum brake booster out there for the 100. But personally, I think you'd be going in the wrong direction. The electronic brake booster rarely seems to fail. It even works when the engine is stalled.
The most common wear/failure seems to be from the M/C seals.... which both systems will have.
If you decide to take the vacuum route, the 2nd gen Tundra still uses vacuum assist for the master cylinder. I have no idea if it is compatible with the 100 chassis. If it is, it might be a good inexpensive source for you. There are plenty 07 and up Tundras in the salvage yards now.
