Golf MK8 brake issue

[keeno88]

Hi all just joined up to see if owners alike are experiencing any similar issues or have any suggestions.

A few months ago I bought a 2021 VW Golf R-Line Estate. I love it apart from one issue which is brake squeal from the front brakes. This always happens after driving for about 5 minutes and only when light braking. Its very annoying!

The noise occurred on the original VW standard disc and pad set which were only 50% worn (car has only done 23K).

I have changed the discs, pads and the 8 metal calliper shims for genuine VW parts. I have also cleaned/ wire brushed/ re-greased the brake calliper and slide pins but the squealing noise still happens (new pads have been bedded in and discs are not glazed)

In additional to this my brake pedal seems to 'clunk' twice when coming off the brakes. It feels like the master cylinder/ booster attached to the pedal isn't returning as quick as the pedal itself. There's also a slight grinding noise when driving.

Anyone have any suggestion on what it could be? ...... calliper sticking?.

 

 

[Volkswagen Owners Club]

Generally, I tend to encounter such issues and squealing or grinding brakes and can attribute it to poorly fitted pads, incorrect or missing shims and more importantly, lack of compound between the pads and caliper carrier bracket.
By not applying a compound such as copperslip (which is not so necessary on stainless shims) you would have a corrosion factor with dissimilar metals.

You have done everything exactly as it should be done (and believe me, most of the issues I have encountered with dragging and squealing brakes are when those who fit the brakes do not do this).
Also, a lot of pads (if supplied from a dubious source of origin) may sometimes be slightly larger due to excess paint on the pads, which sometimes needs scraping back to fit correctly and this leads to the pads 'grabbing' and not retracting once applied.

Outside of the pads and calipers, issues such as a faulty brake servo, ABS and other related hydraulic issues it may be worth checking all wheels spin freely when jacked up and see if you can isolate the faulty component.
Also, check the brake hoses are okay and not damaged in any way

Let us know how you get on with it