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Old 02-08-2010
Rick's Avatar
Rick Rick is offline
Senior Member
Join Date: May 2009
Location: Bellefonte
Posts: 13,226

Ron, The Parking Brake side of the Maxi works when pressure is released from the chamber. A LARGE spring applies the parking brake. Therefore I would think you should not have a leak when the parking brake is set.

Your Truck Shop should have found leaks at the Maxi if you ask them to check the system.
Rick Shawver
1SG Ret
2000 LX
Vise Grips
Bellefonte, AR
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Old 02-08-2010
Friday1 Friday1 is offline
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Join Date: Feb 2010
Location: Toledo
Posts: 1,545

Always remember to chock your vehicle when working on the brakes or under it. One way to find a leaking maxi is to take the line off the fitting marked "SERVICE" at the maxi-usually a green line if plumbed with plastic. The word SERVICE is also embossed on the maxi if you have copper lines. Remove the line and with the parking brake set, air tanks up to pressure, parking brakes RELEASED, spray with soapy water at the fitting. You may have to put your thumb over the fitting to help it make a bubble across the opening. If there is no bubble-the maxi is not leaking back to the foot valve and the leak you heard was something else. Remember to rehook your air lines! A feed back leak like this can make you crazy. It sounds like there are lots of air lines on a BB. There is a flapper looking rubber piece on the footvalve and it is to keep debris from getting inside. Spray soapy water at it and make sure you hold the rubber close to the opening if it is not very close. You are helping the bubble to form if it is leaking. The soap can only bridge so far a gap. Another area to check is the treadle(brake pedal) itself. If the pin it pivots on is rusty and siezed up it can hold your brakes on just a little. That's bad for fuel mileage and real bad on the shoes and drums. A squirt of pentrating oil on the pivot shaft will keep this working good.

1980 FC35, 1961 PD4106 GMC SN:326 Charter member of the Two Bus Club for now
I am in Toledo, Ohio
Rick Gunther
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Old 02-08-2010
rjtoles rjtoles is offline
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Join Date: May 2009
Location: Lees Summit
Posts: 445

thanks Rick great information!!
Ron & Mary Kay Toles
1981 FC
Kansas City
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Old 02-08-2010
Bill Pape's Avatar
Bill Pape Bill Pape is offline
Join Date: Jan 2008
Location: Commerce
Posts: 11,606

Rich ,

Ya need to buy that Bird and stick around , we need another mechanic that talks backyard fixin,
Thanks for the Maxi air leak tip
Bill & Patty
1988 FC, Silver Edition
Commerce, Michigan
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