G2 Rear Disc Conversion

Justdidit · Nov 14, 2012

Think I just found it: : 47730-02110

Britprius · Nov 14, 2012

Justdidit said: ↑

Think I just found it: : 47730-02110

Click to expand...

From memory that looks promising, as I said you can see the caliper is swung open on one bolt to change pads.

Justdidit · Nov 14, 2012

UK Prius Rear Caliper Assembly
47730B CYLINDER ASSY, REAR DISC BRAKE, RH
47730‑02110
47750A CYLINDER ASSY, DISC BRAKE, REAR LH
47750‑02110

Britprius · Nov 14, 2012

That must be it I will post again when I have pictures or any update. Off to bed getting late.

Justdidit · Nov 14, 2012

Thanks, I'll keep looking into this more.

Justdidit · Nov 14, 2012

Justdidit said: ↑

OEM Part Numbers

Caliper
47730-20630 Right
47750-20620 Left
or
47730-02110 Right
47750-02110 Left
Haven't figured out the Exact #s but 47730 & 47750 are correct.
Click to expand...

I wonder what the difference is... why 47730-20630 & 47750-20620 use bolts and the 47730-02110 & 47750-02110 don't use bolts.

maestro8 · Nov 14, 2012

Britprius said: ↑

I can see that mechanically this is quite easy but to get a good balance front to rear could be quite challenging, to much brake spinning you out.
Click to expand...

Brake Proportioning Valves - SummitRacing.com

Hardware exists to solve this problem...

...but this being said, it's not a plug-and-play solution. Especially given the fact that there's ABS in play. You might think you have the valve dialed in, and then in an emergency braking situation, you'll have a very nasty surprise.

Without equipment to measure brake and pedal force, you'll only be guessing at how to set the valve. This is fine in a very controlled environment (such as a closed circuit) with extra safety measures. This is not fine when driving your car in traffic on public roads.

If the brake upgrade creates in a significant difference in cylinder volume, then all bets are off. These valves don't bend the laws of physics.

Justdidit · Nov 16, 2012

What it would "look" like...How To: Rear Disc Brake Conversion - Toyota Matrix Owners Forum

Before:

After:

Justdidit · Nov 17, 2012

So as it looks, the UK Prius shared its rear caliper (w/ no pins)

with the Toyota Corolla Saloon E12T 2001-2004

Toyota Corolla Verso E12J 2001-current

Toyota Corolla Estate E12T 2001-current

Toyota Corolla E12U 2001-current

However the Disc Brake Dust Cover & Assembly was shared with USDM Corolla, Matrix and Celica. So far I see no reason why you couldn't do the conversion using either of the other donor cars rear calipers. (ones with pins) Much easier to acquire here in the US.