From: Jim (jehill@cabinetdoors.com)
Date: Fri Aug 15 2003 - 07:43:31 PDT
My M817 5-ton dump truck has developed a problem with the brakes which has
me stumped.
The brakes are soft. Push the brake peddle the first time and it has some
resistance. It goes all the way to the floor, but has some resistance.
Push the peddle a second time and it goes to the floor with little or no
resistance.
I've followed the procedure (from the manual) to bleed the brakes, and I got
air, but now all lines are air free.
Still the soft brakes.
I hate to start replacing things without knowing the replacement (master
cylinder???) will really fix the problem.
The master cylinder seems to get added boost from the "Air Hydraulic Unit",
but I don't have any documentation on this hydraulic unit.
The trucks air pressure is strong and doesn't leak.
I'm stumped. Anybody have any experience on this type of problem?
What can cause these soft brakes, besides air in the lines?
If my master cylinder is bad, where can I get a new one?
Jim
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