Community Forums

timdriver · 08-17-2012, 03:56 PM

Seems like everyone is commenting on whether to apply the foot valve while the maxi's are set how about some of you check to see where your audible low air indicator comes on. With the brakes set please.

bukzin · 10-29-2012, 09:47 AM

Quote:

Originally Posted by Mr_D

The newer air brakes can not be overpressurized! You can have the parking brake and and hold the tredle in for as long as you want, it won't hurt them.

Does my 2006 Diplomat on a Roadmaster chassis classify
as 'newer' ?

Thanks

BigSkyBob · 10-29-2012, 09:54 AM

Yes ...

TRAILERKING · 10-29-2012, 11:32 AM

Quote:

Originally Posted by BFlinn181

...............
Yes, crawling under and pulling or pushing on the levers can show if they are adjusting properly, but most of us are not 'qualified technicians' and should leave them alone!

You don't need to be "Qualified Technicians" to do that.........It's all part of a requirement to check pushrod travel. Just one of many things needed to know and perform in order to obtain a proper operators license to operate air brake vehicles.

Even though sitting in the driver seat applying "10 hard applications" and assuming everything is adjusting properly does not mean it is without actually pulling on a slack adjuster with a bar to confirm travel.

BFlinn181 · 10-29-2012, 12:05 PM

Quote:

Originally Posted by TRAILERKING

You don't need to be "Qualified Technicians" to do that.....

"Qualified Technicians" is a quote from the Bendix handbook on air brakes. I was just sayin'....

timdriver · 10-30-2012, 07:09 PM

Quote:

Originally Posted by bukzin

Does my 2006 Diplomat on a Roadmaster chassis classify
as 'newer' ?

Thanks

Yes

Mr_D · 10-30-2012, 07:13 PM

Quote:

Originally Posted by bukzin

Does my 2006 Diplomat on a Roadmaster chassis classify
as 'newer' ?

Thanks

I would think so, our 2000 Dutch Star on FL chassis did.

TheJeep · 10-30-2012, 07:27 PM

The reason for not applying the parking brake and the service brakes is so you do not crack the brake drum. The pressure from both the service brake and parking brake could be to much pressure for the drum and it could crack. I have seen thousands of brake drums and have not seen one cracked. Can it happen, yes, but it is not common. It may be a problem with older drums/trucks and that maybe where this has come from. Pumping down the brakes is a good idea if your parking brake valve is located in a bad place.

stuhly · 10-30-2012, 07:55 PM

I seriously doubt if a dog could push hard enough on a parking brake release to release it. If the grandkids are screwing around on the dash just maybe a swift kick in the rear would cure that problem.

TRAILERKING · 10-30-2012, 09:16 PM

Quote:

Originally Posted by stuhly

I seriously doubt if a dog could push hard enough on a parking brake release to release it. If the grandkids are screwing around on the dash just maybe a swift kick in the rear would cure that problem.

Perfectly said...................

wonderer1 · 10-31-2012, 03:46 AM

not touching the foot brake while seting the parking brake on an automatic doesn't sound right. you come to a stop with your mh pointed down hill hope there's nothing infront of you. your parking brake only holds the rear axles. foot brake holds everything. unless you have the switch (for snow and ice) to cut out the steering axle. and too much air presure? spring presure ? they don't add together. it's either or both. no diff. unless your air pressure is low. cracking brake drums (unless defective) usually comes from heat just like when you check a drum.

JimM68 · 10-31-2012, 12:05 PM

I suppose that while there are some who's motorhomes could "roll" downhill while up on the jacks, there could also be some who could explode their brake drums by using their service brakes and parking brakes at the same time, but really?

timdriver · 11-02-2012, 03:27 PM

I've beat on the brake drums when the brake shoes have froze to the drum in freezing weather. If the drums are strong enough to that plus temp. changes within seconds I highly doubt that any applied air pressure could break one.

BFlinn181 · 11-02-2012, 03:49 PM

This whole idea of breaking a brake drum due to applying foot treadle while parking brake is engaged is nonsense to even repeat on this forum. Since the late 1960's the Anti-Compounding valve prevents increasing the air pressure to a harmful level. I'd be very surprised if 135 lbs. of air pressure could crack a brake drum. The full pressure might bend a slack adjuster rod or do other damage in the system, but a cracked drum? Let's stop trying to impress everyone with our 'old timers' experience and stories and let RV owners of air brake coaches know the real facts.