Here's a graphic and pictures of the Model 3 firewall structure that I've annotated with the holes for the brake boosters. The graphic is a view through the left drivers door aperture. The blue is mild steel, yellow is high-strength steel and red is ultra high strength steel. The yellow reinforcement plate is specifically designed to counter deflection of the brake booster. It's centered around the booster attach location and has a vertical gusset on the right side. That gusset will disperse the pedal loads across more of the firewall and keep it from bending forward.
The graphic doesn't show a reinforcement plate for RHD. It's possible RHD cars don't have the left plate and have a specific plate for the right side. It's also possible that the angled blue firewall just to the right of the right booster hole provides "enough" support and there's no reinforcement plate for RHD. The fact that the angled portion of the right firewall intersects the transverse portion directly below the RHD brake booster is clearly by design.
It's readily apparent that the firewall structure has been designed to account for loads going into the brake boosters, as would be expected. It just seems they missed the mark and it's still too compliant to maximize brake feel.
The pictures are from Munro's Model 3 teardown episode on Autoline Network.
The graphic doesn't show a reinforcement plate for RHD. It's possible RHD cars don't have the left plate and have a specific plate for the right side. It's also possible that the angled blue firewall just to the right of the right booster hole provides "enough" support and there's no reinforcement plate for RHD. The fact that the angled portion of the right firewall intersects the transverse portion directly below the RHD brake booster is clearly by design.
It's readily apparent that the firewall structure has been designed to account for loads going into the brake boosters, as would be expected. It just seems they missed the mark and it's still too compliant to maximize brake feel.
The pictures are from Munro's Model 3 teardown episode on Autoline Network.