Check out the related fields. They are fields that obtain value based on another. The advantage is that you save coding the onchange event.

https://www.odoo.com/documentation/12.0/reference/orm.html#related-fields

Hi, 

Both models should be linked. So we'll add a M2O field in model B like this: 

a_id = fields.Many2one('model.A')

Then consider adding a ochange like this: 

@api.onchange('type'):
def onchange_type(self):
if self.type == ' 1':
    self.a_id.type = True
else:
​    self.a_id.type = False

Hope this helps.