Lorries Brake Vacuum

Into the booster?

overnite wrote: Into the booster?

That would be my guess

Paul

Ditto :huh:

As they used to say on the old Charlie Baker, "That's a 4".

I will take fly spray to kill the spiders under Lorry and crawl up under there to see where it goes. For a truck it must be lowered or Im very bloody round in the middle as I don't fit too well under there. Makes sense it goes to the booster but wouldn't the tanks supply the booster?

Goes up the pushrod seal. PBR boosters are notorious for this. On those, it get sucked into the manifold and burns in the engine.
You may also find the booster just full of brake fluid in the vacuum chamber. BTDT.

Jarrod.

If it's diesel it will have a vacuum pump on the rear of the alternator

If it has sucked brake fluid in I'm fairly sure it will of returned into the sump thru the oil return line

It wouldn't be a huge drama as it's only a small amount

My little Isuzu does the same every now and then, I have noticed the pedal feels very un assisted last time I drove it, I must investigate this

Paul

Paul, I was wondering where it would go in that case.
Curiosity satisfied.

Cheers, Jarrod.

Yep Lorry is a diesel and has the vacuum pump on the back of the alternator but that end up there is bone dry so no fluid getting that high up.
The possibility of it getting behind the diaphragm in the booster/s is a possibility as they are mounted on the tanks and since I have not been in that area I cannot confirm if fluid is inside.
I think I will let sleeping dogs lie and see if more fluid disappears.