Help - Brake Problems. As I apply the brakes the pads do not grab right away.

[EricS4]

I just finished another bleed, including cycling the ABS with the VAG-COM, and the problem remains.

@vw16vcabby

after pumping the pedal and it is rock hard, keep your foot on it applying steady pressure. may take a minute or two. if the peddle doesnt fade, then that would tell me hydraulic side is intact. if the pedal drops then there is air in the system or it is open. i’d then be looking toward a booster issue.

I did this and the pedal is still firm.

@vw16vcabby

if thats the case, check the line from the booster to the engine. pinhole or possible bad check valve-- especially look around where the line runs through the firewall. these plastic lines are prone to breaking w/ age. it is like 70 bucks new iirc. or you can get a check valve and rubber line/clamps and make your own.

I would not rule out the booster, yet that would be last on my list.

I repaired leak in the booster line a few months ago. I found it while pressure testing for a boost leak. I did another leak test tonight and everything seems fine.

Funny you mention the ABS because its been in the back of my mind as the possible cause. The sound made while the pedal returns to the extended position is very similar to sound the ABS system makes when its cycled with the VAG-COM.