New Calipers, bleed, and no brakes

[rlivingood]

Have a 2003 MC trailer with a Titan/Dico 6000 actuator. The system had "Reliable" calipers, but one has stuck twice even after rebuild and last weekend another stuck. Actually, don't think the brakes were working (given that rolling down hill at the ramp used to do the slow bounce hop when without the boat, but not recently). Regardless, replaced the calipers with Kodiak 225s. Bled the system well (used vacuum to prime and then the normal pressure method from the actuator. Replaced all the old and very dirty brake fluid with new Dot 3.

When testing the brakes using either a screwdriver under the actuator to pump the master cylinder or the 2x4 method to push the master cylinder the calipers are not giving enough pressure against the disks. When using the actuator to bleed the system the brake fluid is coming out the master cylinder fine. I suspect it isn't putting pressure enough to cause the brakes to work.

There are no leaks at the master or any of the new calipers. Since the bleeding is working the reversing solenoid (cut off type) isn't preventing fluid from reaching the calipers.

With the wheels off I can see when a buddy pumps the actuator cylinder using either of the above methods that the caliper pistons to actuate, but only weakly and I still have free play at the calipers to the disks.

I am thinking master cylinder rebuild, but wanted to see if anyone else has ideas to try before trying to get the parts and rebuilding the master cylinder and then re-bleeding the whole darn thing again.

Good thing I've got a big F350 to pull the boat since I don't think I've noticed the brakes not working for quite some time. So I think I'm still good to go this weekend, but want to get this back to "correct" operation (not looking forward to the trailer bounce down the ramp when going to pull out the boat, but at least I'd know the brakes are "working" when this is happening.)

Any ideas or leads on parts for this actuator would be great.

Thanks again TMC.

Rod

[rlivingood]

I've found the following parts, but mostly they show the 60 or the 7500 as the correct actuator for these parts. Sometime they show the same part for the 6000. The 7500 and 6000 look almost identical.

D47142 MASTER CYLINDER (DISC) FOR MODEL 60 & AERO 7500

TITAN Model 60 Actuator Disc Master Cylinder #4820000

It appears that the D47142 and 4820000 are the same.

I think I'd rather just get another complete master than rebuild it given the cost difference is only about 25 bucks.

This all depends on if I'm on the right track with the problem description above and the thoughts that this is probably it.

[rlivingood]

For pictures see this recent thread:

http://www.mastercraft.com/teamtalk/showthread.php?t=42517

[rlivingood]

Looked again, wanted to update that this is a reversing bleed solenoid, not a blocking solenoid.

Still thinking it is a master cylinder rebuild required.

Kyle (where are you? :-) You were so much help on the picture of the actuator.

[rlivingood]

Well here is my update. Replaced the master cylinder. Bought a D47142 from a local trailer supply. Come to find out the unit didn't have a connection for the return of the reversing bleed solenoid so I had to go down to a couple of hardware stores to find a 3/8 x 24 tap and a 21/64 drill bit. Drilled and tapped the bleed return. Additionally, the top plate for the D47142 has an offset fill hole as were the original had a centered fill hole. Swapped the top plates and slightly modified the gasket to fit. Thus, two special mods to replace the original unit. Filled the unit up and bled the master. Going back to bleed brakes and see if that actuates the calipers.