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Author Topic: 4106 brake relay valve  (Read 1795 times)

Offline fortyniner

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4106 brake relay valve
« on: February 18, 2022, 04:07:14 PM »
Can someone point me to the modern replacement for the rear brake relay valve for 4106. It has single circuit brakes.

 I was adjusting slack and my helper did a heavy apply and both rear stayed applied. Fronts were retracted but not rears. Cracking a chamber line its still got pressure.  Eventually it drains off and chambers retract.

This valve has three mounting holes. 
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Tom Phillips
PD4106-453
PD4106-2864
87 Alfa Milano
93 Range Rover
87 190e-16 Mercedes
92 Jeep Comanche

Offline buswarrior

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Re: 4106 brake relay valve
« Reply #1 on: February 18, 2022, 06:39:34 PM »
Call Luke at US Coach and it will be on the way with your credit card.

Good catch, finding that lazy relay valve!!!

Happy coaching!
Buswarrior
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Frozen North, Greater Toronto Area
new project: 1995 MCI 102D3, Cat 3176b, Eaton Autoshift

Offline Boomer

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Re: 4106 brake relay valve
« Reply #2 on: February 19, 2022, 08:26:24 PM »
DD-3's not releasing?  Try a couple more applications.
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'81 Eagle 15/45, NO MORE
'47 GM PD3751-438, NO MORE
'65 Crown Atomic, NO MORE
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'93 Vogue IV, NO MORE
1964 PD4106-2846
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Offline richard5933

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Re: 4106 brake relay valve
« Reply #3 on: February 20, 2022, 04:29:02 AM »
Quote from: Boomer on February 19, 2022, 08:26:24 PM
DD-3's not releasing?  Try a couple more applications.

Didn't think that the 4106 had DD3 brakes. Have these been changed?
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Richard
1974 GMC P8M4108a-125 Custom Coach "Land Cruiser" (Sold)
1964 GM PD4106-2412 (Former Bus)
1994 Airstream Excella 25-ft w/ 1999 Suburban 2500
Located in beautiful Wisconsin

Offline RJ

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Re: 4106 brake relay valve
« Reply #4 on: February 23, 2022, 02:22:47 AM »
Quote from: richard5933 on February 20, 2022, 04:29:02 AM
Didn't think that the 4106 had DD3 brakes. Have these been changed?
Richard -

DD3 brakes were an option on late production 4106s.

Fortyniner -

Luke's number, if you don't have it already, is 1-888-262-2434

FWIW & HTH. . .  ;)

RJ
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1992 Prevost XL Vantaré Conversion M1001907 8V92T/HT-755 (DDEC/ATEC)
2003 VW Jetta TDI Sportwagon "Towed"
Cheney WA (when home)

Offline chessie4905

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Re: 4106 brake relay valve
« Reply #5 on: February 23, 2022, 07:16:25 AM »
I guess first, how many hoses connected to each brake chamber? Two or three?  Can't see from here.
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GMC h8h 649#028 (4905)
Pennsylvania-central

Offline buswarrior

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Re: 4106 brake relay valve
« Reply #6 on: February 23, 2022, 11:22:16 AM »
How did this stray onto DD3?

OP has identified a lazy releasing relay valve, and said it has 3 mounting holes...

Winter fever is setting in...

Happy coaching!
Buswarrior
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Frozen North, Greater Toronto Area
new project: 1995 MCI 102D3, Cat 3176b, Eaton Autoshift

Offline chessie4905

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Re: 4106 brake relay valve
« Reply #7 on: February 23, 2022, 02:33:12 PM »
yes they do and both type chambers use same relay valves, possibly different model. mine uses r6
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GMC h8h 649#028 (4905)
Pennsylvania-central
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