My 2003 E320 Cdi has developed most annoying creaky callipers, so much so that in traffic queues it is quite embarassing. It also has SBC. I have whipped the pads out of one and lightly depressed the brake and it is clearly the calliper creaking. It does appear the dust boot is slightly damaged but not significantly. MB Main dealer has told me all is fine in brake performance but to replace is around £400 per calliper fitted for which I dont want to pay. Is there any effective solution or spray, as appreciate I have to be careful what product to use?. Thank you Gordon