Loud nocking on front wheel it comes and goses also no noise when cluth is down
SOURCE: vw t4 '03 tapping noise
Hi,
Next time it's tapping at idle, press the brake pedal hard several times. If it stops tapping then gradually returns then it is a noisy vacuum pump.
It can go on like that or years (if you can put up with the tapping that is!) if you start to loose servo assistance while manovering then it's time to change the pump.
Hope that helps.
SOURCE: VW T4 2.5 TDI engine makes rattling noise no loss
hi. that noise is the vacuum pump knocking. it should stop if you press the break pedal a few times or pull the pipe of the break servo. £120 on ebay half hour job to change
SOURCE: when driving getting a loud clicking noise coming
sounds like you got a worn outer cv joint, check and replace
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