I've had Magura hydraulics, front & rear, on my fine Doublevision since acquiring it new from Tandems, Ltd, (BirminghamAL-USA) 17 years ago, with the intent that I'd captain, my daughter would stoke and my son could pilot his own upright on an excellent Summer biketour from VictoriaBC-Canada to TijuanaBC-Mexico. However, that was not to be; so I had this most expensive, fine pedaling machine and have used it continuously since whilst home in El PasoTX-USA, with a 7-month interruption (resulting from being rear-ended 29MAR2009; I wasn't hurt, but the Doublevision needed significant repair....!
Anyway, it came equipped with HS11 hydraulics, which I had Crazy Cat-Airport upgrade to HS33 a few years later. I have only been impressed with them, very effective stopping power, no noise, simply superb. However, I did change out the OEM brake pads with Kool-Stops a month or so ago, and they (front) recently started squaking horrendously whilst on an overnight biketour to Sunland ParkNM-USA & Cd. JuarezCHIH-EUM. Sure, I could return to Crazy Cat, but then I'd miss out on the joy of being able to fix it myself. I've narrowed the cause down to the fact that the pads are still relatively new (<200 miles/320kms) and will employ some of the remedies suggested. Thank you!