Surge brakes pulsating or "machine gunning"

[rgardjr1]

Here is the fitting with the small orifice:



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[SpryBeast]

My dealer also suggested that I install the fitting with the smaller hole for this same problem. The one they got me was part number #650680, orifice .0018. To be honest I can't speak to it's effectiveness as it's been sitting on my workbench for 2 years.

[mikeg205]

I would contact dennis at UFP...

http://www.ufpnet.com/ContactUs/tabid/60/Default.aspx

dennis is the TN location.

[rgardjr1]

Originally Posted by SpryBeast

My dealer also suggested that I install the fitting with the smaller hole for this same problem. The one they got me was part number #650680, orifice .0018. To be honest I can't speak to it's effectiveness as it's been sitting on my workbench for 2 years.

Do you know if you have the UFP actuator on your trailer? The reverse lockout solenoid on the Reliable actuator has a different thread type than the UFP actuator. I tried to source a fitting to convert it, but I haven't had any luck. I wish I had some one at my local Mastercraft dealership that could answer questions for me, but I've struck out so far.

[SpryBeast]

Originally Posted by rgardjr1

Do you know if you have the UFP actuator on your trailer? The reverse lockout solenoid on the Reliable actuator has a different thread type than the UFP actuator. I tried to source a fitting to convert it, but I haven't had any luck. I wish I had some one at my local Mastercraft dealership that could answer questions for me, but I've struck out so far.

Pretty sure mine is Reliable.

[kgrove]

I still don't have a picture, but my dealer tells me I have a Reliable actuator - apparently no longer used on Mastercraft. He replaced the master cylinder and the shock already and also did something about the size of some kind of orifice (all these repairs are doing something to the size of one of my orifices as well).

I'm told Reliable is out of business and parts are unavailable so my only choice is to switch to UFP (Unique Functional Products).

[rgardjr1]

Originally Posted by kgrove

I still don't have a picture, but my dealer tells me I have a Reliable actuator - apparently no longer used on Mastercraft. He replaced the master cylinder and the shock already and also did something about the size of some kind of orifice (all these repairs are doing something to the size of one of my orifices as well).

I'm told Reliable is out of business and parts are unavailable so my only choice is to switch to UFP (Unique Functional Products).

I'm in the same boat. My Reliable master cylinder went T.U. and I'm replacing it with a UFP. I wasn't going to use the orifice because the threads didn't work, but now it sounds like I need to. I'm pretty sure the newer Mastercraft trailers use the UFP actuators so there should be an orifice part available through Mastercraft. Keeping my fingers crossed.

[mikeg205]

where was that fitting....coming out of the master cylinder? connected to a small hose feeding back to the master cylinder reservoir?

[rgardjr1]

Originally Posted by mgorczak1

where was that fitting....coming out of the master cylinder? connected to a small hose feeding back to the master cylinder reservoir?

The fitting was connected to the reverse lockout solenoid one one side and the flexible brake line that runs to the brakes on the other.

[mikeg205]

That would not cause the chattering. When I spoke with the folks at UFP the only things that cause that noise is a bad shock absorber, air in the lines, or a bad master cylinder...in my case the shock was bad.