[AJD] What are failed Master Brake Cylinder Symptoms?

[Terry L. Hrdlicka]

BUMMER!

There isn't a brake line running INSIDE the frame somewhere on that 
thing that could have a hole in it?  Lacking any obvous leaks, that 
might be something to look into.

Sounds like one of the "simple" problems I'm always getting tangled up in!

Put the thinking caps back on guys,

Terry


Dean VP wrote:
> Thanks for all the suggestions, but.........Well folks, I replaced the
> Master Brake Cylinder and I still have the same problem. Bench bled the MC,
> installed it, bled all the lines and at each wheel twice. Get initial
> pressure on the pedal and then the pedal slowly fades away to the
> floorboard. Bleeding the lines offered no additional help although air was
> pushed out of the lines. 
> 
> I haven't verified that I'm loosing fluid during the fade down because I
> lost so much fluid bleeding the lines. Need to next check with a full
> reservoir to see if there is fluid being pumped somewhere. 
> 
> Either I got another MC that is as bad as the one before or I have a bad
> Vacuum assist mechanism or a leaking wheel cylinder somewhere. No visible
> leaks but harder to tell because now I made a mess bleeding the wheel lines.
> 
> 
> I was hoping to get lucky and have the problem solved with a replacement MC.
> No such luck. Going to plug the line just before it goes into the Vacuum
> assist the next chance I get and see what happens. 
> 
> Something isn't kosher here. Not making logical sense. 
> 
> Dean A. Van Peursem
> Snohomish, WA 98290
> 
> I'm a walking storeroom of facts..... I've just lost the key to the
> storeroom door 
> 
> 
> www.deerelegacy.com
> 
> http://members.cox.net/classicweb/email.htm
> 
> 
> 
> -----Original Message-----
> From: antique-johndeere-bounces at lists.antique-tractor.com
> [mailto:antique-johndeere-bounces at lists.antique-tractor.com] On Behalf Of
> Dave Ernst
> Sent: Thursday, July 14, 2005 6:33 AM
> To: Antique John Deere mailing list
> Subject: Re: [AJD] What are failed Master Brake Cylinder Symptoms?
> 
> Hey Dean, Ed is correct. I have a dump truck and just went through the 
> identical problem. I stalled a couple of days before I bought a rebuilt 
> hydro-vac because I was trying to determine if burning brake fluid was 
> cheaper than gasoline....:)
> Dave
> 
> 
>>Dean-
>>Sounds to me like you have 2 problems. 1. Being the master cylinder 2. 
>>Being
>>the vacuum booster or hydro-vac. The Pedal fad sounds like fluid passing 
>>by
>>the rings and cups on the master cylinder piston and should be rebuilt. 
>>The
>>unexplained fluid loose tells me the booster is bad and the brake fluid is
>>being sucked back into the engine intake by engine vacuum. Some boosters 
>>my
>>be rebuilt but I would recommend buying a remanufactured unit. The master
>>cylinder you should have no problem rebuilding yourself. Good luck
>>
>>Ed Allandar
>>Rohrer Bus Service
>>P.O. Box 100 - 1515 State Road
>>Duncannon, PA 17020-0100
>>717.957.5114 Direct
>>717.418.4401 Cell
>>1-800-735-6700 x223 Toll free
>>717.957.4884 (fax)
>>eallandar at rohrerbus.com
>>
> 
> 
> 
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