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+--- Thread: 89SP air brake wont release, all pressure gauges normal(115) front +rear (/showthread.php?tid=7206)
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89SP air brake wont release, all pressure gauges normal(115) front +rear - Ed Gardels - 10-08-2008 04:31
--- In WanderlodgeForum@yahoogroups.com, "Gregory OConnor"
>
Thanks to those who chimed in with ideas. Im going back to storage
today and try these suggestions. It's finnaly a little cooler here in
Texas for crawling under my rig. I also searched the archives and
printed a few things.
Thanks
Ed Gardels 89sp
Arlington Texas
> you dont need the service brake (foot pedal) on to release the
> spring brake. I park on a slight incline with the tow hooked and
> release the spring/parking brake, let it roll to about 2 mph then
> pull the park/spring brake lever to a stop, never touching the
> pedal. the parking brake is refered to as the spring brake because
> there is a spring that is always trying to apply the brake. when
you
> release the brake the valve fills a chamber behind the spring and
> compresses it in. the drive axle has a brake chamber with twin
> pumkin looking things. one pumkin is for the service brake and one
> holds the spring. There is a long bolt on each twin pumkin that
is
> a tool to manualy release the brake for towing or emergancies.
>
> I wonder if the brake camed over??? that is if the shoes are so
> worn the lever that pushes the shoe to the drum went past
center?????
>
> it could also be modulator valve hung up or the 2 way valve. . I
> would try dumping the air by shutting the bus of and pumping the
> service brake untill it exhaust then try once again but wait untill
> the tanks are full to max before you try and release the parking
> spring brake.
>
> if its a valve problem, chock the tires and dont leave air in the
> tanks while parked.
> Greg94ptCa
>