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Re: thanks Dave Lenzi [message #365122 is a reply to message #365098] Tue, 29 June 2021 14:08 Go to previous messageGo to previous message
RF_Burns is currently offline  RF_Burns   Canada
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
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Senior Member
If you read DaveL's article in a recent GMCMI magazine, you will know what ebyker is talking about.

The OEM brake valve did not limit the pressure to the rear brakes while the replacement brass valves do. They are made for cars and light trucks that do not have much weight on the rear end, so the rear brake pressure was limited to about 70% (~700-800psi if I recall). Our rear heavy coaches do not need this pressure limiting so it was not an OEM valve feature.

His article shows how to identify the valves and remove the pressure limiting parts and get full brake pressure to the rear brakes again.

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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