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1. 06:24 AM - Allegro Hydraulic Brakes (Hugh McKay III)
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| Subject: | 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
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