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When the parking brake is applied, if I push on the foot
When the parking brake is applied, if I push on the foot pedal air leaks from the trailer protection valve exhaust. … read more
Daniel Wilson
Daniel Wilson
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2006 volvo vnl 670 wabco meritor brake sytem when applying
2006 volvo vnl 670 wabco meritor brake sytem when applying air to tractor and trailr both parking brake buttons will not stay in however tractor and traire rolls away … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
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I have a 2006 international 9200 semi tractor. When
I have a 2006 international 9200 semi tractor. When bobtailing and you step on the brake pedal, air comes out of the blue service line that hooks to the trailer. Footvalve and parking brake valve in t… read more
Jeremy
Jeremy
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Associate Degree
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I have a 2000 western star 4964ex the service (blue) line is
I have a 2000 western star 4964ex the service (blue) line is leaking air when applying the foot brake with the trailer disconnected... we have changed the tractor Protection Valve and the foot valve a… read more
Daniel Wilson
Daniel Wilson
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2012 pro star plus international change foot valve and tp5
2012 pro star plus international change foot valve and tp5 valve still have a problem bleeding air through service glad hand when push pull valve on trailer applied and brake on trailer will lock down… read more
Jeremy
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I have a 2011 international workstar 7400 series. The brake
I have a 2011 international workstar 7400 series. The brake light is staying on, How can I check this?… read more
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Alex Olsen
auto/diesel/industrial
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I have a 2013 international workstar 7400 series. Sometimes
I have a 2013 international workstar 7400 series. Sometimes my parking brakes doesn't hold. How can I fix this?… read more
Jeremy
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Kenworth T660 serial 221528. Leaking air through valve
Kenworth T660 serial 221528. Leaking air through valve mounted on the driver side below 5th wheel . It supplies air to service side of brake chamber . This one after releasing parking brakes starts bu… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
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Just to make myself clear with the park brakes released then
Just to make myself clear with the park brakes released then applying the foot peddle i have no air leaks but with the park brake on and apply the foot peddle i have air coming out the supply/emerganc… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,243 satisfied customers
2011 Freightliner Coronado no air at red glad hand when
2011 Freightliner Coronado no air at red glad hand when trailer valve is pushed in on dash. if red trailer valve is pushed in on dash and you step on brake pedal then air feed out of red glad hand but… read more
Daniel Wilson
Daniel Wilson
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Truck pro star international 2008 air leak at the air brake
truck pro star international 2008 air leak at the air brake foot valve i replaced with a new one still doing the same it is leaking at the center of the valve, there is a screw and a flappy rubber sea… read more
Wayne
Wayne
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Vocational, Technical or Trade Scho
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I have a 2006 stetling A9513 single axle road tractor I am
I have a 2006 stetling A9513 single axle road tractor I am going to install a dump bed and I would like to keep the air trailer brakes and plumb them to my rear hitch plate the truck has wabco anti lo… read more
William Herren
William Herren
A.A.S.
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I Have a 2007 Freightliner Classic XL. I am having a problem
Hi I Have a 2007 Freightliner Classic XL. I am having a problem with the air system that just started today. With both of the dash valves pulled out(tractor and trailer) and I step on the brake pedal,… read more
Wayne
Wayne
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Vocational, Technical or Trade Scho
11,543 satisfied customers
If it this 2007 Columbia When there is a brake application
If it this 2007 Columbia When there is a brake application With the trailer Sometimes the trailer brakes stays on Without trailer too sometimes the brake light stays on I checked the drake switch air … read more
Wayne
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Vocational, Technical or Trade Scho
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I have 2003 freigtliner FL70 when foot brake is applied air comes out
I have 2003 freigtliner FL70 when foot brake is applied air comes out of blue service fitting for trailer hook up in rear of truck not sure what valve to look at… read more
Wayne
Wayne
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Vocational, Technical or Trade Scho
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my Kenworth 2002 Service brakes wont release when applied.
my Kenworth 2002 Service brakes wont release when applied. it is the same with or without trailers connected the only way to release brakes, is to apply the yellow parking brake then release it. it th… read more
Rudolph Diesel
Rudolph Diesel
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Vocational, Technical or Trade Scho
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I have a 2003 Mack Vision tipper towing a 4 axle dog trailer.
I have a 2003 Mack Vision tipper towing a 4 axle dog trailer. When you apply the park brakes for the trailer they do not engage for approx 10 seconds. Also, if you apply the truck and trailer park bra… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
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I have a 1993 Volvo Gm truck. The air brake proportioning
I have a 1993 Volvo Gm truck. The air brake proportioning valve was recently changed by the customer. They also changed the dash valve and they are sure all the hoses are connected rightly. The proble… read more
spankyjr1
spankyjr1
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Vocational, Technical or Trade Scho
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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