Leaking air when braking

[krminyl@...]

Leroy,

Thanks for the offer of your drawings...I have one here with my blue box,
but thought I'd find someone who once experienced the same, and I hoped to
shortcut the troubleshooting. I'll take a gander at my drawings...thanks
again.

Kevin Mc
YL CA
86 38PT



************************************** See what's free at http://www.aol.com.


[Non-text portions of this message have been removed]

[Kevin McKeown]

Coming home from the weekend in my BB last night, I was in some heavy
stop and go traffic, and I kept hearing some hissing of air whenever I
applied the brakes, and watched my air pressure begin to go down
noticibly when the brakes were activated. When I let off the brakes,
the hissing stopped, and the air began to build up normally. The air
sounded like it was somewhere street side, toward the middle or front
part of the bus. It was like an air line to a wheel came off, but the
brakes worked fine. The air got down to around 70 PSI, and after about
5 minutes of this 0-10mph using the brakes only when necessary (big gap
to the car ahead of me) everything return to normal...no more hissing
on braking, pressure built up to around 125-130 PSI and purged from the
dryer, etc, and the rest of the 60 or so miles home were uneventful.
Don't we love these intermittent problems....

Something stuck, and now OK? Something to look for/replace? Since it
is OK now, where should I begin to look? I was afraid of getting stuck
on the So Cal Fwy's when the air got down to 30 PSI and my brake button
popped...ideas??

Kevin McKeown
Yorba Linda, CA
1986 38' PT

[dshetron1]

--- In WanderlodgeForum@yahoogroups.com, "Kevin McKeown"
wrote:
>
> Coming home from the weekend in my BB last night, I was in some heavy
> stop and go traffic, and I kept hearing some hissing of air whenever I
> applied the brakes, and watched my air pressure begin to go down
> noticibly when the brakes were activated. When I let off the brakes,
> the hissing stopped, and the air began to build up normally. The air
> sounded like it was somewhere street side, toward the middle or front
> part of the bus. It was like an air line to a wheel came off, but the
> brakes worked fine. The air got down to around 70 PSI, and after about
> 5 minutes of this 0-10mph using the brakes only when necessary (big gap
> to the car ahead of me) everything return to normal...no more hissing
> on braking, pressure built up to around 125-130 PSI and purged from the
> dryer, etc, and the rest of the 60 or so miles home were uneventful.
> Don't we love these intermittent problems....
>
> Something stuck, and now OK? Something to look for/replace? Since it
> is OK now, where should I begin to look? I was afraid of getting stuck
> on the So Cal Fwy's when the air got down to 30 PSI and my brake button
> popped...ideas??
>
> Kevin McKeown
> Yorba Linda, CA
> 1986 38' PT
>
Probably a blown diaphragm on a brake chamber.

[Leroy Eckert]

I'm just guessing and telling you what I would do, and I am not totally familiar
with the system.

Based on the symptoms, logically it does not appear anything let go downstream
of an air control valve because it is now normal.

My guess is that some foreign material may have gotten into an air control valve
and was subsequently expelled overboard when the brakes were released. My air
drawings are at the bus or I could look to see how the air flows and exits the
system. To my thinking, and sometimes that is radical, the symptoms indicate an
air control valve or beyond.

I would not do anything now, and that is easy to say because it is not my bus.
You could go on a wild goose chase trying to find out what happened.

Just my logical guess. If you have an air system drawing you should be able to
see how the air gets around. If not, I have one for my 1990 and can supply it
to you later in the week.

Leroy Eckert
1990 WB-40"Smoke N Mirrors"
Niceville, FL



----- Original Message -----
From: Kevin McKeown
To: WanderlodgeForum@yahoogroups.com
Sent: Monday, April 02, 2007 2:14 PM
Subject: [WanderlodgeForum] Leaking air when braking


Coming home from the weekend in my BB last night, I was in some heavy
stop and go traffic, and I kept hearing some hissing of air whenever I
applied the brakes, and watched my air pressure begin to go down
noticibly when the brakes were activated. When I let off the brakes,
the hissing stopped, and the air began to build up normally. The air
sounded like it was somewhere street side, toward the middle or front
part of the bus. It was like an air line to a wheel came off, but the
brakes worked fine. The air got down to around 70 PSI, and after about
5 minutes of this 0-10mph using the brakes only when necessary (big gap
to the car ahead of me) everything return to normal...no more hissing
on braking, pressure built up to around 125-130 PSI and purged from the
dryer, etc, and the rest of the 60 or so miles home were uneventful.
Don't we love these intermittent problems....

Something stuck, and now OK? Something to look for/replace? Since it
is OK now, where should I begin to look? I was afraid of getting stuck
on the So Cal Fwy's when the air got down to 30 PSI and my brake button
popped...ideas??

Kevin McKeown
Yorba Linda, CA
1986 38' PT





[Non-text portions of this message have been removed]

[Leroy Eckert]

I understand. Please let us know what you find.

Leroy Eckert
1990 WB-40"Smoke N Mirrors"
Niceville,FL



----- Original Message -----
From: krminyl@...
To: WanderlodgeForum@yahoogroups.com
Sent: Monday, April 02, 2007 6:02 PM
Subject: Re: [WanderlodgeForum] Leaking air when braking


Leroy,

Thanks for the offer of your drawings...I have one here with my blue box,
but thought I'd find someone who once experienced the same, and I hoped to
shortcut the troubleshooting. I'll take a gander at my drawings...thanks
again.

Kevin Mc
YL CA
86 38PT

************************************** See what's free at http://www.aol.com.

[Non-text portions of this message have been removed]





[Non-text portions of this message have been removed]

[Gardner Yeaw]

I believe you have a dual system, that is two air tanks, one for
the front and one for the rear. There should be valves to prevent a
leak in one system from effecting the other. Did both systems loose
presure or just one?

Gardner
78FC33

--- In WanderlodgeForum@yahoogroups.com, "Leroy Eckert"
wrote:
>
> I understand. Please let us know what you find.
>
> Leroy Eckert
> 1990 WB-40"Smoke N Mirrors"
> Niceville,FL
>
>
>
> ----- Original Message -----
> From: krminyl@...
> To: WanderlodgeForum@yahoogroups.com
> Sent: Monday, April 02, 2007 6:02 PM
> Subject: Re: [WanderlodgeForum] Leaking air when braking
>
>
> Leroy,
>
> Thanks for the offer of your drawings...I have one here with my
blue box,
> but thought I'd find someone who once experienced the same, and
I hoped to
> shortcut the troubleshooting. I'll take a gander at my
drawings...thanks again.
>
> Kevin Mc
> YL CA
> 86 38PT
>
> ************************************** See what's free at
http://www.aol.com.
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
> [Non-text portions of this message have been removed]
>

[krminyl@...]

both



************************************** See what's free at http://www.aol.com.


[Non-text portions of this message have been removed]

[krminyl@...]

thanks...I'll take a look at my air line to the left front wheel....

Kevin



************************************** See what's free at http://www.aol.com.


[Non-text portions of this message have been removed]

[Lawrence Thornell]

Kevin
I had the same symptoms . The hose to the lt front wheel was cracked. New
hose, less than $10, problem solved. My pressure would drop until the step
came out.
LT 90 SP Eclectic, AL
----- Original Message -----
From: "Gardner Yeaw"
To:
Sent: Monday, April 02, 2007 8:33 PM
Subject: [WanderlodgeForum] Re: Leaking air when braking


> I believe you have a dual system, that is two air tanks, one for
> the front and one for the rear. There should be valves to prevent a
> leak in one system from effecting the other. Did both systems loose
> presure or just one?
>
> Gardner
> 78FC33
>
> --- In WanderlodgeForum@yahoogroups.com, "Leroy Eckert"
> wrote:
>>
>> I understand. Please let us know what you find.
>>
>> Leroy Eckert
>> 1990 WB-40"Smoke N Mirrors"
>> Niceville,FL
>>
>>
>>
>> ----- Original Message -----
>> From: krminyl@...
>> To: WanderlodgeForum@yahoogroups.com
>> Sent: Monday, April 02, 2007 6:02 PM
>> Subject: Re: [WanderlodgeForum] Leaking air when braking
>>
>>
>> Leroy,
>>
>> Thanks for the offer of your drawings...I have one here with my
> blue box,
>> but thought I'd find someone who once experienced the same, and
> I hoped to
>> shortcut the troubleshooting. I'll take a gander at my
> drawings...thanks again.
>>
>> Kevin Mc
>> YL CA
>> 86 38PT
>>
>> ************************************** See what's free at
> http://www.aol.com.
>>
>> [Non-text portions of this message have been removed]
>>
>>
>>
>>
>>
>> [Non-text portions of this message have been removed]
>>
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