Brakes Shake

[Lenny Bruce]

Hello good morning,My brother restored a ‘30 coupe. All components On the car are brand new. When applying the brakes firmly the car shakes violently!
Now my guess would be the shoes and drums arent true? He unfortunately passed away unexpectedly on us recently at 53 years old. So I can’t ask him
Excactly what his thoughts are. Any input where to start would be great. I never had to adress this issue with our cars. Thanks,Lenny