Brake valve?

jmblake · January 18, 2018, 04:56:54 PM

I aired up the bus with shop air to check for leaks after I moved the brake pedal valve, now I have air coming out the exhaust on the bottom of the valve

It leaks with the parking brake valve on or off, if I press the brake pedal it stops for a few seconds then continues to leak. It didn't leak before I changed the lines and it also din't start to leak right away while I was airing up the bus. I'm thinking that when I had things apart and cleaned the valve witch I did plug all the ports, that I got dirt in the valve. What would be the best way to clean it out? disassemble it? or could I flush something through it? Now as soon as I start putting air to the bus it starts leaking.
Thanks Jason

Dave5Cs · January 18, 2018, 05:26:04 PM

Jason try as the air is coming out to tap it with a piece of wood on the bottom of the valve and sometimes they blow it out or close if it is stuck open. Are you sure you got the lines back on in the correct order. I have done that before.

jmblake · January 18, 2018, 05:33:38 PM

Dave, I marked the lines and most of them would only go on one way but anything is possible. It didn't leak at first until I pushed the parking brake valve off. I'll try the tapping on it tomorrow, actually the second time I aired it up it didn't leak quite as much as the first time.
Jasom

jmblake · January 19, 2018, 02:07:10 PM

I got to mess with it a little bit this afternoon and when I put my hand over the bottom of the valve where the air is coming out and block it off it starts to apply the brakes I did tap on it with a block of wood and kind of slowed the leak down but now I'm wondering if I would have gotten a line mixed up
Jason

buswarrior · January 19, 2018, 04:30:27 PM

Can you confirm brake action at the wheels?

Something won't move right somewhere, if lines are messed up?

You say you cleaned the valve? What did you do to it? This may be the problem, something didn't survive the cleaning?

Happy coaching!
Buswarrior

jmblake · January 19, 2018, 04:37:46 PM

I could definitely see the front brakes working and when I said I cleaned the valve when I removed it from the bus I plugged the lines and clean the grease off in the parts washer
Thanks Jason

Dave5Cs · January 19, 2018, 05:01:43 PM

Yep agree with BW. Check that every brake is working or slacks are moving when brakes applied. You could also remove the supply line and shoot a little air tool oil( like we use in our air nailers) in it. Put back on and try airing up again and push brake a few time while airing.

jmblake · January 19, 2018, 05:13:16 PM

I will confirm tomorrow if the back brakes are working once I get someone to help me. I may try the air tool oil, just wasn't sure if that would hurt anything on down the line. I honestly don't think I got the lines switched but anythings possible.
Jason

Dave5Cs · January 19, 2018, 05:39:02 PM

Just a few squirts of air oil is good for it every so often for sticky valves. Alcohol not so much, just dries out rubber bits.

luvrbus · January 19, 2018, 05:59:24 PM

Jason, that a E-6 dual circuit valve check the gauge to see if both tanks are air up the same if not you have the supply and service side lines mix up,with the front brakes working I would guess you have the rear service and supply line plumbed wrong lol BTDT

jmblake · January 19, 2018, 06:12:59 PM

Thanks Dave and Cliff, I will try these out tomorrow, I don't think I got the supply wrong because it was the biggest line and I didn't change the fittings on the valve just got ride of the old copper line and replaced with plastic It's the one with the shinny brass T the other black line goes to the front brakes.
Jason

luvrbus · January 19, 2018, 06:30:00 PM

You should have 2 supply lines a primary and a secondary

jmblake · January 19, 2018, 06:39:26 PM

Okay, Not sure witch one would be the secondary, It would have to be one of the green lines, Does it go into the valve on the same section as the primary?

jmblake · January 20, 2018, 05:35:18 PM

I tried some air tool oil through the valve and no such luck it is still leaking, also confirmed that the back brakes are engaging when I push the brake pedal, Does any one know if this is a E-6 valve? I was at my local truck supply store and they had a E-6 and it looked just like it. MCI wants almost $350.00 for one

Jason

chessie4905 · January 20, 2018, 05:49:34 PM

looks like e-6. The lower portion should be secondary. Just replaced mine and substituted nylon lines for most of the copper ones. Worked through compartment under driver and a 4x6 hole above front bumper to change it. Major pita. After finishing, I discovered the was a 18x30inch removable panel in ceiling of spare tire compartment. Not mentioned in manual. Funny complete access with panel removed. Damn!

https://www.finditparts.com/products/2160460/bendix-286171n?srcid=CHL01SCL010-Npla-Dmdt-Gusa-Svbr-Mmuu-K2160460-L21&gclid=EAIaIQobChMIiLSR2_bn2AIVGUwNCh0J4Q2REAQYAiABEgKgwPD_BwE

You can also Google e-6 at bendix site.
Did you have any leaks before you started? You may still just have the same problem. If so, it could be a leaking dd3 diaphragm or leaking inversion valve or check valve.