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Tires, Wheels, Brakes, Steering and Suspensions Discussion of preventative/corrective maintenance and other technical issues regarding your coach's Tires, Wheels, Brakes, Steering and Suspensions and related components.

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  #1  
Old 06-26-2010
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Default Stuck Brakes

Returned from round trip to New Orleans from Chattanooga, no problems Coach ran fine. Started to move it today and the brakes will not release. Air Pressure 120 PSI.

Anyone else experienced this.
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1998 LXi
Murrells Inlet, SC
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  #2  
Old 06-26-2010
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sometimes the rear spring/park brakes stick,
put it in gear and add a very little throttle.
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  #3  
Old 06-26-2010
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Thanks Bill, I did try a little throttle, but I was afraid I might break something. I could feel it pulling, I don't want to break an engine mount or stress the transmission.
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1998 LXi
Murrells Inlet, SC
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Old 06-26-2010
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heck just try reverse

if worried jack er up and take off wheels and hit the arms of the brakes they will pop loose

sometimes the brakes rust to drums or the s cams rust
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2003 LX Single Slide Hauling Wood 5
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  #5  
Old 06-26-2010
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Hello Woody,

It's backed into the building, do not have room to back up. When I get help, I'll chock the front wheels, jack it up (using jack stands) and inspect the cans and cams. Just thought maybe someone had experienced it before.

I have had brakes freeze and not release, but nothing in 100 deg weather.
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1998 LXi
Murrells Inlet, SC
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Old 06-26-2010
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mine has stuck before

i was backed into my barn so i clocked it good
released air brakes had some folks around to help oversee the work and crawled under and hit the brake arm 1 time with 2 lb sledge and it worked loose .....
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RWoody
2003 LX Single Slide Hauling Wood 5
2 miles east from Texas Highway 37-97
Just a Hobby Shop now-Bird Repairs upon Appt and my Schedule -USAR Retired
Pleasanton Tx 78064
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  #7  
Old 06-27-2010
Friday1 Friday1 is offline
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You could just have frozen clevis pin or pins causing the slack adjuster to stay in the applied position slightly. Woody's suggestion to help the slack adjuster to release with a blow from a hammer is a great suggestion. You would be driving the slack adjuster back toward the can or pancake. When you get the brakes to release, grease the S cam bushings and hit the clevis pins with penetrating oil. The clevis pins at the end of the slack adjusters are very exposed to the elements and prone to working slow or sticking.
If the brakes are still stuck, remove a line from a rear can. Look for the word "SERVICE" embossed on the can. If there is air coming out of the can with the parking brake released-you have a bad can and leaking from the "EMERGENCY" side. If there is air coming from the line-even just a little you have a stuck treadle valve. Usually a little PB Blster on the pedal shaft where it pivots on will get it to release. Make that part of your normal maint.-when you lube door hinges and drawer slides give the treadle a shot too. You can just pull up on it hard to see if you hear the rush of air signalling you have gotten it to release. Hope this helps.
Rick in Ohio
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  #8  
Old 06-27-2010
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if they are ;out of adjustment ;worn too thin, ;brokenshoe, ;bent brake push rod, ;wrong brake part it could be 'cam-over' . the spring brake applies x amount of psi force and the service brakes apply added force which can break the shoes if the protection valve that limits the added force is screwed. If the rod bends it changes the config and the top dead center of the camover is achieved earlier. If the adjustment is way out and you bang on the brake while the parking/spring is on you can cam over. Brake applied and push rod went past TDC.
. or PO replaced brake parts with wrong size/spec.
Might be the best time to drop $100. and call a mobile tec. Problem may not show up again until you are in city traffic.

I recently assisted my mobile tec as he replaced a rear seal on my PT drive. I got into a discussion as he wanted to snug the auto slack back up. My method is to under adjust brakes and let the slack adjustors bring them into spec. the only way to find spec when you over adjust is friction/wear = heat.

here is a question?
A PT is Parked on a hill.
spring brake/ Parking brake set.
drive axle loses airbag pressure (steer and tag maintain air).
what holds the bus parked?
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1994 wb40
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  #9  
Old 06-27-2010
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I know,but we need to see if we have members that know.
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  #10  
Old 06-27-2010
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Are you getting a sound when releasing the emergency/service brake??

Try moving the emergency/service brake button in and out multiple times. Sometimes the button is sticky, sometimes the brakes or valves in between switch and brakes are sticky.
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Last edited by The_Money_Pit; 06-27-2010 at 01:20 PM.
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