Join Date: Jun 2013
Location: Mobile, AL, USA
Brake hose in control circuit
I'm a new LT owner for about a month and a half. 2002 LT with 65K miles. Absolutely love the bike. (Still love the airheads, too!)
Anyway, noticed some drops of brake fluid on the garage floor underneath the rear brake foot lever. Traced the leak to the brake hose crimp just above where the brake hose enters the master cylinder. This brake hose is the one that connects to a brake line that then goes to the pressure modulator. So, definitely need a new hose. The master cylinder doesn't appear to have any leakage, so I won't replace it, unless I get some advice from the forum that at 65K miles it would be advisable to do so.
I have printed out and read several articles from the internet describing flushing the integral servo-assisted brake system, and I also have the BMW service manual with the integral servo brake section in it. I'm not afraid to dive into the work myself, but I do have a few of questions.
First, BMW brake hose versus Spiegler brake hose. I've generally been happy with the quality of parts for my airheads, and this control circuit doesn't carry more than normal brake line pressure. What I don't know is during the process of routine maintenance how often the footplate has to come off, which invariably results in some twisting, turning motion at the crimp where my hose is leaking. So, is a Spiegler line more "robust" at that crimp than the BMW line?
Second, it seems to me that replacing this brake hose will let air into the control circuit for the rear brake. Now I will have to bleed the rear brake control circuit (maybe the front too, but I'm not sure). The process seems pretty straightforward, but maybe I'm naive about the difficulty. Assuming I'm successful at the bleeding process, it appears I will have set some fault codes for the brake system. The service manual describes the dealer service called MoDiTeC. But, will a GS-911 read and clear the fault codes? I'd like to avoid going to a dealer if at all possible to perform this repair.