hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Fri Jun 15, 2007 6:18 pm Post subject: Hydraulic Brakes - Update |
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Hi Everyone. Many thanks to all of you for the input to my brake problem. I am well on the way to getting it fixed. Here is what has happened so far.
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First of all I want to thank Dave Grosvenor for the suggestion that I contact Evektor CZ, and EvektorAmerica concerning the brake system itself, as Evektor CZ is the manufacturer of the brake system used on the Allegro. After contacting the US Allegro Distributor (Fantasy Air USA) asking for help and getting absolutely no help what so ever, I contacted both Evektor CZ, and EvektorAmerica in Texas. Both Evektor CZ and EvektorAmerica responded immediately. They gave me photographs and a cross section drawing of the brake caliper showing all the internal parts and advised me of what my problem probably was (bad O-ring or piston seal “cup”. They even gave me a written procedure for removing the seals and installing new ones. I was also concerned that the DOT 4 brake fluid I was using may be harmful to the seal material, however they advised that the same type brake fluid was used in their planes in Europe, and was fully compatible with the EDPM material used in the seals. Because the leaking fluid had over time saturated the brake pads on the right brake I was advised by the brake fluid manufacture to replace the pads, and not reuse them.
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The only other issue was the price. Unfortunately the price for two O-rings and the piston “cup” shipped from Evektor CZ to me here in the States was $75.00 US and it would take weeks for them to get here. At that point I contacted EvektorAmerica with the same problem and was able to get the O-rings, piston “cups”, disc tab washers for both wheels, and two replacement brake pads for the right wheel from them in Texas for $68.00 including shipping. So I purchased everything from our Texas friends, EvektorAmerica. Again, many thanks to you Dave for pointing me in the right direction, and to you Thom, Etienne, and others for the technical advice as to the possible cause. I will post the brake rebuild procedure received from Evektor CZ on the Forum List for the benefit of all. What we do and communicate on this forum is the lifeblood to many of us Allegro owners. Thanks again. Thom, I enjoyed you latest article in EAA Sport Pilot Mag. “To Rent or Own”. Based on your assumptions and costs the break-even point between owning and renting is about 80 hours of flight time. But, if you just want to own the “darn thing” and fly when you want to all this is a mute point.
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Hugh McKay in NC
Allegro 2000
Rotax 912UL
N661WW
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