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Brake problem

 
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aerosiam



Joined: 26 May 2008
Posts: 59
PostPosted: Thu Jul 10, 2008 6:04 pm    Post subject: Brake problem Reply with quote
Has anyone experienced reduced brake effectiveness?
Our 100hp plane had excellent brakes and could hold 5000 RPM when new. Now it can hardly hold 3500. This happened over a short period of time
We removed the master cylinder. The seal doesn't look perfect but seems usable. We bled the system several times.
We have asked the factory for a new seal a few days ago and await a response.
Paul

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Thom Riddle



Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
PostPosted: Fri Jul 11, 2008 1:53 am    Post subject: Re: Brake problem Reply with quote
Paul,

Our experience has been similar. After sitting overnight, we usually need to pump the brake actuating lever a couple times to restore firmness. Occasionally, we have to add a bit of fluid to the master cylinder which restores function. We have a paper towel wrapped around the master cylinder to catch any leakage but have never seen any signs of leaking, either there or elsewhere in the system. Although a slight nuisance, with the above actions it is stable and the brakes still work very well when needed.

We've not replaced any seals so if you do so, please let us know how effective this is.

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Thom Riddle
Buffalo, NY (9G0)



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Roger Lee



Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
PostPosted: Sun Jul 13, 2008 2:44 pm    Post subject: Re: Brake problem Reply with quote
Hi Guys,

Maybe I can help. What brake system does the Allegro use? The Flight Design CT has bad Italian brakes and they have had the same symptoms as the Allegro. As ours have gone bad we are now switching to Matco brakes. The Italian brakes had half the stopping power, high speed brake fade and you had to pump them. The symptoms start after a while. The Matco's have twice the stopping power and you never have to pump them. They will hold to 5000rpm from a 912uls.
I helped get this new brake system on line for the CT and maybe we can do the same for the Allegro.

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Thom Riddle



Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
PostPosted: Sun Jul 13, 2008 5:05 pm    Post subject: Re: Brake problem Reply with quote
Roger,

I know the Allegro brakes, at least the ones on our 2003 model, are made in the Czech Republic and believe they are made by Evektor. The Evektor LSA has the same brakes. When they are pumped up they hold very well and have good stopping power. Not enough to lock up and skid the tires but enough so that you don't feel the need for any more power.

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Thom Riddle
Buffalo, NY (9G0)



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aerosiam



Joined: 26 May 2008
Posts: 59
PostPosted: Sun Jul 13, 2008 11:21 pm    Post subject: Re: Brake problem Reply with quote
Thanks for the feedback.
I suspect a new seal would improve the brakes and they did really work well when new.
Regards

Paul

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