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Old 07-27-2014, 03:05 PM   #1
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Lash's Avatar
 
Monaco Owners Club
Workhorse Chassis Owner
Join Date: Apr 2008
Location: Montgomery Texas
Posts: 266
Meritor Wabco Nice to Know Tidbit

During the last trip out, I started getting the ABS light as well as Hydraulic Trouble light and yet everything functioned as if nothing was wrong. We were commuting across northern NM and AZ on I40 and it was extremely hot. Air inlet by Scangauge was 118 to 123 degrees. Coolant temp was 198 to 203 most times.

When we let the unit sit overnight, the alarms would go away and not return until the temps again got back into the range above. This could be as long as 5 hours of travel into the hot afternoon. Talked twice to two different Meritor Wabco techs and they both said to remove the cap from the master cylinder and see if any hissing occured. They said that the cap is self venting and sometimes gets plugged which does not allow the brake fluid to flow where required. This must be a common problem for two people to tell me same thing on two different days.

I ordered a new cap in Sacramento and installed and seemed to work well at first. Then climbing a long grade into Needles Ca got the alarms again when inlet temp got to about 123 degrees. Stopped in Kingman Az for night and looked at the master cylinder again and found that it was over the max mark by about 3/4 in. Siphoned off fluid to the max mark and continued on the next day. Temps were in same range again across the high desert and in the four days it took to get back to Houston there were no alarm events.

Believe the cap changeout and insuring the system was filled to max (cold) may have solved the problem.
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