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  #61  
Old 02-16-2014, 05:47 AM
phil_edgecumbe phil_edgecumbe is offline
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Join Date: Oct 2012
Boat: Prostar 205 - 1997
Location: Australia
Posts: 16
My pulsating brake problem solved!

Initial Problem:
Problem was the brakes would oscillate at about 1Hz. The harder the car braked the more violent the "machine gunning" was. If the brakes were applied gently then progressively harder the problem did not arise. Stopping in a hurry was not ideal and I needed to fix the problem.

Setup:
1997 Prostar 205 on Mastercraft trailer (2000kg gross weight in total).
Tandem trailer with hydraulic drum brakes on all 4 wheels.
Override brake converted for Australian regulations with 3/4in master cylinder.
Fluid changed and brakes bled.
Brake shoe adjusters backed off 6 clicks.
1/8in gap between override coupling and brake actuating lever.

Solution:
Changed the master cylinder from 3/4in to 7/8in.
No more oscillation under brakes!!

I guess the conversion to different master cylinder caused the system to find it's resonant frequency. Changing it to 7/8in made the brake actuation less sensitive and moved the resonant frequency somewhere else.

I hope this is of value to any other guys in Australia with imported boats with override couplings.

Australian regulations mandate that trailers over 2000kg total weight need self contained electric over hydraulic systems with breakaway connections. I wasn't looking forward to the cost of fitting the system if I didn't have to.
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  #62  
Old 02-16-2014, 01:48 PM
Cloaked Cloaked is offline
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Join Date: Dec 2004
Boat: MasterCraft
Location: Kingston,TN USA
Posts: 4,602
Quote:
Originally Posted by phil_edgecumbe View Post
Override brake converted for Australian regulations with 3/4in master cylinder.

Australian regulations mandate that trailers over 2000kg total weight need self contained electric over hydraulic systems with breakaway connections.
I have never seen a setup like the brake controller but certainly I am happy happy happy for you that you rid the problem. I cannot stand to have an issue that bugs me to no end....Good solution....

Aside from the funky (relatively speaking) looking brake contraption, you have a nice looking machine. Nice looking cover too....

Best to you in Oz.... As the earth tilts, we're fixing to take up with summer when you are winding down in another month or two or three....

Thanks for the pictures....

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Quote:
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..Some of you give a whole new meaning to the phrase "another @sshole with a Mastercraft."

RE: Thrall, Welcome to the club....
NEW SKINS in TN... Leading Edge Marine Interior

feedback on a TN company: http://www.mastercraft.com/teamtalk/...ad.php?t=58767

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