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12-11-2013, 01:51 PM | #1 |
Senior Member
Join Date: Apr 2011
Location: Glenmoore Pa
Posts: 1,644
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Big Truck Brakes?
Does anybody on here know about BIG truck brakes? I am having an issue with an F5 where the wheel cylinders will not release once depressed.
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12-11-2013, 02:01 PM | #2 |
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Join Date: Jan 2011
Location: west bend wi
Posts: 314
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Re: Big Truck Brakes?
Possibly the master cyl is not returning all the way or the return hole in there is plugged.
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12-11-2013, 02:07 PM | #3 |
Senior Member
Join Date: Apr 2011
Location: Glenmoore Pa
Posts: 1,644
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Re: Big Truck Brakes?
I was thinking the same thing. The piston is returning all the way because I can feel it on the end of the pushrod. Maybe the release valve inside is sticking?
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12-11-2013, 02:41 PM | #4 |
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Join Date: May 2010
Location: Reading PA
Posts: 241
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Re: Big Truck Brakes?
I had a 45 ton and a half that had the same problem. Truck had vaccum assisted brakes. There was a leak in the tubing leading to this vaccum booster. Once I fixed the leak the brakes would release.
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12-11-2013, 03:16 PM | #5 |
Senior Member
Join Date: Apr 2011
Location: Glenmoore Pa
Posts: 1,644
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Re: Big Truck Brakes?
That sounds like the military style air brakes, similar to a tractor trailer. This setup has a separate booster that runs on vacuum. Im starting to think it was never assembled properly by the previous mechanic but im not sure.
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12-11-2013, 10:59 PM | #6 |
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Join Date: Jul 2010
Location: UPSTATESC
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Re: Big Truck Brakes?
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