Glossary entry (derived from question below)
English term or phrase:
lay down the main bracket
Portuguese translation:
levantar o descanço central
English term
Brazil
lay down the main bracket
Turn the power switch to the ON position, whether all kinds of lights are on, whether all switches are working, whether the horn is ringing, and whether the power switch is normal.
If there is no difference, lay down the main bracket to make the rear wheel touches the ground.
Mar 10, 2021 18:51: Nick Taylor Created KOG entry
Proposed translations
Portuguese to English, English to Portug
Native in: English 
Works in: Portuguese to English, English to Portuguese
levantar o descanço central
recolha o suporte principal
United States
BA in Transl., MA in ESL, 15 yrs of exp.
Native in: Portuguese 
Works in: English to Portuguese, Portuguese to English, Spanish to Portuguese, and 2 more.
rebaixe o suporte principal
rebaixar: tornar-se mais baixo
https://www.aulete.com.br/rebaixar
Entendi isto: rebaixe o suporte principal para fazer com que a roda traseira toque o chão.
Brazil
32 years engineering/law/contracts
Native in: English (Variant: US) , Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Portuguese to English
instale o suporte principal
Brazil
Eng. PhD. EN PT.BR ABRATES Accredited
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Portuguese to English
abaixe a estrutura principal
Brazil
Experience you can rely on
Native in: Portuguese
Works in: English to Portuguese, Portuguese to English, Spanish to Portuguese
abaixe o suporte principal
Mexico
Apps, Metallurgy, Production and Lean
Native in: Portuguese
Works in: English to Portuguese, Spanish to Portuguese, English to Spanish
Discussion
The "real" english would be
RETRACT THE CENTRE STAND SO THAT THE REAR WHEEL TOUCHES THE FLOOR
Explanation: The "centre stand" is that thingy in the middle of a motorbike, that you put down on the floor and pull the bike UP, so that it stands upright with the back wheel off the floor - https://www.youtube.com/watch?v=SIdS421acos