Drum in Disc Conversion

[smarty72]

Toyota mustn't agree that the rear does more work under braking, as they fitted the bigger, thicker discs to the front.

If the rear does more braking, they would have beefed up the rear brakes...

Erm, no.

Front discs are 255mm diameter.
Rear discs are 263mm diameter.

That's one measurement taken in isolation.

You need to look at all the dimensions, at which point it is apparent that the front brakes are bigger with a greater 'swept' area of the disc;

height - 43mm versus 41mm
Thickness - 20/18mm versus 16/14mm

Yes the overall 'diameter' is marginally smaller, but the disc overall is bigger.

[lamcote]

Also look at the relative size of the callipers. The front brakes will always do more work than the rears.
The size of the rear discs will be as a result of what Toyota already had access to in the parts bin that could be made to work more than anything else.

[Ardent]

To go back to the original post.
As a starting point, might the prius gen 2 offer a starting point.
Thats what they have.
Drum in disc. Drum in hat. And quess what.
Works very well. Once it is adjusted correctly. (Cheers steve)

[Ardent]

Clearly much work to do. 2 rear driven prius front driven. But, Mr T does do this arrangement.

[Ardent]

How does the self adjuster actually work? That might help figure why they are so bad

On phone so not an exhaustive answer.
Look for exploded diagrams in academy section.
But basically within the piston/caliper an adjusting nut should move along a thread to take up wear of pad. Problem is nut often seizes on the thread ( for whatever reason) rather than work its way along it.