---------------------------------------------------------- Allegro-List Digest Archive --- Total Messages Posted Mon 06/04/07: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:24 AM - Allegro Hydraulic Brakes (Hugh McKay III) ________________________________ Message 1 _____________________________________ Time: 06:24:48 AM PST US From: "Hugh McKay III" Subject: Allegro-List: Allegro Hydraulic Brakes Gentlemen: I have determined that the right hydraulic brake unit on my Allegro 2000 is slowly leaking brake fluid from the clearance between the slave cylinder (piston) and the cylindrical bore in the finned housing. This fluid is ending up on the brake pads and the disc itself. Eventually over time I loose braking. I need to repair this unit. Not having seen this unit disassembled, I dont know if the internal 0 ring seal (I assume it is an 0 ring) is mounted in a groove on the slave cylinder (piston) i.e. the 0 ring moves with the slave cylinder, or if the 0 ring seal is mounted in a groove in the cylindrical wall of the finned housing i.e. the 0 ring does not move when the slave cylinder moves. Have any of you serviced, or do you know of some one who has serviced the Allegro 2000 hydraulic brake units? If you have, can any one answer the following questions for me: 1. What size O ring is used in the unit, and what type material is the O ring made of? Where can they be obtained? 2. After removal of the finned piston unit from the wheel and disc, and after removing the 90 brass fitting from the end of the finned piston unit, can the large hex nut on the end of the finned cylinder casing be removed to extract the internal cylindrical piston? If so, how is the slave piston extracted and replaced after a new 0 ring seal is installed (assuming an 0 ring is used to make the seal)? 3. Are there any other internal parts that could be damaged that would cause the fluid to slowly leak? 4. There are locking retainers used at the points where the disc itself is bolted on to the wheel. Where can these small retainers be obtained? I have asked the US Distributor (Fantasy Air USA) these same questions, but have received no clear answer to either question. I have contacted Evektor-Aerotechnik a.s. (the brake manufacturer) in the Czech Republic and they can supply parts to me. But before I order any parts from Evektor-Aerotechnik I want to be sure I can indeed fix the brake unit. I would appreciate anyones help in this matter. Hugh McKay Allegro 2000 N661WW ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message allegro-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Allegro-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/allegro-list Browse Digests http://www.matronics.com/digest/allegro-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.