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Old 09-20-2011, 09:02 PM   #15
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Your John Deere chassis is 4 wheel disk brakes with a Hydromax booster system. Simular to the Hydroboost (used on GM P30) but uses a electrical motor for residual backup mode. Same type of system used on the Ford F53 motorhome chassis. Could be either the master cylinder or booster binding up. Like several people recommended, first step is to flush your system.


Dave in Virginia
1978 Winnebago Chieftain
Dodge M400 - 440-3
Classic Winnebago Site: http://www.classicwinnebagos.com/forum/index.php
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Old 09-21-2011, 12:40 AM   #16
Join Date: Jun 2011
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I pulled the master and hydromax out. The master was stuck. Replaced that. The hydro was leaking decided to replace all seals. Still leaks. Need a new one. But ive got brakes just need to replace the hydro unit. Im wondering if the master got stuck cause the piston on the hydro unit is to long? Everything seems ok for now. When i replace the hydro ill look at it.

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Old 11-01-2011, 10:49 AM   #17
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So it appears that I'm going to have to shave down the piston on the hydromax unit. It seems to be over extending and its leaking out of the weep hole. I'm wondering if this is a design flaw. When the piston over extends it appears to be pushing the masted cylinder to far forward causing the brakes to stick. The last master cylinder I pulled was completely pushed in and wouldn't come out. So I'm gonna try shaving .005 ill see if that works.

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