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Old 02-08-2013, 02:35 PM   #1
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Tag Axle Brake Problem - Need Help

I have the MoreRyde tag axle system on a '98 Dolphin MH. The brakes and power steering were working fine before I took it in to get the oil changed. I saw on this forum that there is a second brake system on the tag axle that is connected to the regular brakes. And that there was a fluid reservoir that needs to be checked. So I had the mechanic check it and he found it was dry. He filled it up and bled the lines. In the meantime, the power steering failed while he had the MH. He replaced the PS unit and now the brakes won't work properly.

It will stop but when the brake pedal is depressed and as you come to a stop, the pedal shudders and vibrates until you let off. It does it worse when the system has been running for a little while. Not so much when it is cold.

He normally does not work on MH's and the tag axle is also new to him. I think I need to find a solution with him as I can't drive it from his shop to a RV shop as it is too dangerous. I do not trust the brakes the way they are now.

Could this be a vacuum issue, not bled properly, etc.? If anyone has some ideas, please let me know.

Thanks,

John
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Old 02-08-2013, 03:25 PM   #2
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If the tag axle brakes had not been working for a long time then the drums are probably rusty and grabbing. If you have ABS and the are grabbing then the pedal will shudder. If this I'd so then it will all fix itself after they have been used for awhile
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Old 02-08-2013, 03:57 PM   #3
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Quote:
Originally Posted by Mike Canter View Post
If the tag axle brakes had not been working for a long time then the drums are probably rusty and grabbing. If you have ABS and the are grabbing then the pedal will shudder. If this I'd so then it will all fix itself after they have been used for awhile
Thanks for the quick feedback. I'm not sure if it has ABS but the shuddering will occur without the MH in motion. It happens when the engine is warm but not when it is cold. I'm having him plug off the vacuum line to the tag axle and see if that makes any difference. He also thinks the tag booster may be leaking since he can hear what he thinks is air escaping. But he did not think that would cause the shuddering of the pedal.

John
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Old 02-08-2013, 04:08 PM   #4
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Well with that more information I take back what I said. The vacuum brake booster has probably gotten a hole in the diaphragm and is making s vacuum leak on the motor which is causing the motor to miss and shake
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Old 02-08-2013, 06:28 PM   #5
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Well with that more information I take back what I said. The vacuum brake booster has probably gotten a hole in the diaphragm and is making s vacuum leak on the motor which is causing the motor to miss and shake
Well the motor runs fine. It's the brake pedal that shudders when depressed. It is very strange. I'm sure there is an answer somewhere and maybe even a simple one.

John
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Old 02-08-2013, 06:34 PM   #6
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Have him pull the drums and look at the pads and surfaces. If they had not been working before, good chance parts are seized from sitting. Have him check the springs and pistons for smooth movement.
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Old 02-20-2013, 08:27 PM   #7
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Finally fixed

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Have him pull the drums and look at the pads and surfaces. If they had not been working before, good chance parts are seized from sitting. Have him check the springs and pistons for smooth movement.
It turns out that the PS pump he got from Autozone was bad and caused the chattering of the brake pedal. The MH has a hydroboost brake system and it is powered by the PS pump.

Thanks for all the feedback.

John
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Old 02-20-2013, 08:41 PM   #8
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Thanks for the follow up. I will keep that info stored for future use.
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