Thread: 300tdi brake vac pump

Originally Posted by Discovery-94

....
piston has a fair bit of play - about 5mm or so loose movement.

Just want to check before installing whether this is normal..?

Yep!
I have a brand new one here, Unipump too.
I don't think it's piston movement.
The plunger (that has the slack) is not directly connected to the piston, so the slack seems to be between the plunger and the piston.

Originally Posted by AK83

Yep!
I have a brand new one here, Unipump too.
I don't think it's piston movement.
The plunger (that has the slack) is not directly connected to the piston, so the slack seems to be between the plunger and the piston.

ok, great. puts my mind at ease.

and yes, you're right, its plunger not piston movement, wrong terminology..