Rylux

Is there a vacuum pipe going to this 'kind of dump valve'? If so I would check its condition, make sure there are no splits in it. You could also use a vacuum pump to manually apply vacuum to see if anything is moving.

Hello to all, I am new to the Toyota brand after getting myself a Hilux. I love it! Hoping to pick the brains of like-minded people for upgrade and modification advice in the future. So thanks in advance!!