Son got the goal that his performance, and Spurs’ display, deserved when he latched onto Sergio Reguilon’s cross to tap home from six yards.
A 12th-minute own goal from right wing-back Sergi Canos gave them the lead, before Son Heung-min finished off a scintillating counter-attack in the second half.
The opener came from a Son dinked cross after a short corner, with Pontus Jansson’s clearing header ricocheting off Ben Davies and onto Canos before flying into the roof of the net.
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Spurs pressed for more goals, with Son denied from range in the first half, while Harry Kane saw a one-on-one effort well saved by Alvaro Fernandez after the break.
It was a limp display from Brentford, with their only shot on target in the whole game a tame left-footed effort from Ivan Toney.
Tottenham climb to sixth – two points behind West Ham in fourth – while Brentford slip to 12th. (BBCsports)