Hi all,
Me again,
What is this thing in the front of my coach and what does it do,
Its part of the braking system and its connected by a thin rubber tube,
I dont even know what its called, So cant search for it,
It keeps blowing the hose off it,
Another question, My trip meter has stopped working on the speedo, Any ideas on how to fix it,
Thanks in advance, Brian,
Brian,
The round globe looks like a vacuum reservoir. The very thin line from the reservoir probably goes up to your air conditioner/heater control. The air flow control doors in the dash are positioned by vacuum motors.
The other thing may be a vacuum generator? Air pressure blows across a venturi and generates vacuum?
Do a Google search for Ford D7ht-19c747 to see discussions about this type device on other brand coaches.
I don't think either of them have anything to do with your brakes.
Can't help you on the tripmeter...
Cheers
Thank you, It has air in it, Thats why I presumed it was some thing to do with the brakes,
I have no idea on it, But connected to the AC in the front could be it,
It dissapears into the wood work, and I dont know where it goes,
They are both connected by the tube
Yes, your dash HVAC system operates by vacuum. The round thing is the vacuum reservoir. If the air/vacuum unit is not functioning, any small 12 VDC vacuum pump can be substituted. You will also find these 12 VDC units on many diesel powered vehicles for the same purpose, so pretty common.
Here is one: http://www.dormanproducts.com/p-30657-904-214.aspx
Cannot find it at the moment, but there was a recent thread discussing the vacuum amplifier. This link is to one on Amazon so at least you know what to search for. Dorman Vacuum Amplifier (https://www.amazon.com/Dorman-HELP-47076-Vacuum-Tank/dp/B000COB8FA/ref=pd_ybh_a_46?_encoding=UTF8&psc=1&refRID=QRV2PG8VQ23A8CVX5FVB)
This link is to an older thread about installing a vacuum pump Vacuum Pump (https://www.foreforums.com/index.php?topic=17289.msg135034#msg135034) which might be relevant along with this thread (https://www.foreforums.com/index.php?topic=41285.0)
You're probably talking about my thread where I recently went through much of the same learning curve: Dash Air Stuck on Defrost/Vacuum Pump Replacement (https://www.foreforums.com/index.php?topic=41510.msg413716#msg413716)
That looks like it, Thank you,
Remember, if your vacuum pump is cycling a lot, your control on the dash will have a fault that allows a leak when the slider is all the way in the left position. Make a stop or remember to keep it a quarter inch to the right. If allowed to run much of the time, the vacuum pump will burn out.
Pierce
If it's blowing the hose off the round vacuum generator the exhaust port is clogged, probably by bugs
I had an issue with the tube into the vacuum reservoir (spherical thing) falling off. I found the end of the tube expanded and slightly cracked due the expansion. I trimmed the end and used a tiny amount of silicone to hold it in for good.
Replacing the tube is difficult because the other end passes through the fire wall and under the dash somewhere. Only the end seemed bad, the rest of it appeared to be good.