81-87 rear brake circuit have residual check valve stock? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

87chevy.com · 07-03-2019, 05:42 PM

Do 81-87 rear brake line/ circuit have residual check valve stock or is it just a strait shot from the combo valve to rear brake hose?
Thanks
Clint

SCOTI · 07-03-2019, 05:48 PM

Quote:

Originally Posted by 87chevy.com

Do 81-87 rear brake line/ circuit have residual check valve stock or is it just a strait shot from the combo valve to rear brake hose?
Thanks
Clint

All the one's I've worked on were a straight shot after the prop valve. My 89 dually as well.

87chevy.com · 07-03-2019, 05:54 PM

Quote:

Originally Posted by SCOTI

All the one's I've worked on were a straight shot after the prop valve. My 89 dually as well.

Thanks, I looked and didnt see anything other than what looked to be unions... but wanted to ask just in case

SCOTI · 07-03-2019, 06:48 PM

Quote:

Originally Posted by 87chevy.com

Thanks, I looked and didnt see anything other than what looked to be unions... but wanted to ask just in case

Yep.... Unions are all I recall seeing as well.

GRADYS Performance · 07-09-2019, 01:20 PM

Wouldn't the Residual Pressure valve be located in the outlet of the Master Cylinder for the rear drum brakes?

rpmerf · 07-09-2019, 02:21 PM

Isn't there a valve in the prop valve that can flip and not give pressure to the rear? Should light up the BRAKE light on the dash. I believe there is a tool to hold it in place while bleeding

87chevy.com · 07-09-2019, 08:34 PM

Cpp has a tool to keep the Brake light from tripping... pretty crappy quality, its threads are too small so it feels like it is cross treading.. will it work yeah, will it damage anything no, but I will probably mak a tool out of the old sensor that I probably wont ever use... I picked up cop disc / disc valve finally.. I'll install it in a few weekends.
Just replaced the rear drop brake line..
Sum b, had to replace the brake end fitting as it rounded off.
Clint

**Hart_Rod** · 03-03-2020, 01:30 PM

Slightly off topic, but has anyone ever heard of anti-locking rear brakes on an 87? Any information on them? Just noticed it's on my window sticker.

**Palf70Step** · 03-03-2020, 05:27 PM

Rob, 88's had it standard, so it could have been an option in 87. I have never owned or driven an 87 so not sure. Newest square I have had was an 83.

**Hart_Rod** · 03-03-2020, 06:41 PM

Quote:

Originally Posted by Palf70Step

Rob, 88's had it standard, so it could have been an option in 87. I have never owned or driven an 87 so not sure. Newest square I have had was an 83.

Interesting. I don't see any ABS modules, just thought it was interesting on this year model. Thanks Bill!

kipps · 03-03-2020, 07:18 PM

Quote:

Originally Posted by Hart_Rod

Slightly off topic, but has anyone ever heard of anti-locking rear brakes on an 87? Any information on them? Just noticed it's on my window sticker.

I have an 87 3/4 ton. It came from the factory with a load-control valve above the rear axle. Supposedly under very heavy braking conditions, the rear of the truck would lift up, and would be prone to locking the rear brakes. This valve would close off the rear brake line, and reduce the chance of the rear locking up in these conditions. This valve is commonly removed.

I don't know if the 1/2 tons had the same valve. If so, GM may have called it anti-lock brakes, as a marketing gimmick.

Keith Seymore would know what's meant by "anti-lock brakes", I'm sure.

07-03-2019, 05:42 PM	#1
87chevy.com BMW & ASE Master Certified Join Date: Feb 2004 Location: Houston, Texas Posts: 1,266	81-87 rear brake circuit have residual check valve stock? Do 81-87 rear brake line/ circuit have residual check valve stock or is it just a strait shot from the combo valve to rear brake hose? Thanks Clint __________________ 1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress

07-09-2019, 01:20 PM	#5
GRADYS Performance Registered User Join Date: Dec 2013 Location: Columbus, Oh Posts: 367	Re: 81-87 rear brake circuit have residual check valve stock? Wouldn't the Residual Pressure valve be located in the outlet of the Master Cylinder for the rear drum brakes?

07-09-2019, 02:21 PM	#6
rpmerf Registered User Join Date: Feb 2011 Location: Parkville, MD Posts: 1,024	Re: 81-87 rear brake circuit have residual check valve stock? Isn't there a valve in the prop valve that can flip and not give pressure to the rear? Should light up the BRAKE light on the dash. I believe there is a tool to hold it in place while bleeding __________________ 1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z

07-09-2019, 08:34 PM	#7
87chevy.com BMW & ASE Master Certified Join Date: Feb 2004 Location: Houston, Texas Posts: 1,266	Re: 81-87 rear brake circuit have residual check valve stock? Cpp has a tool to keep the Brake light from tripping... pretty crappy quality, its threads are too small so it feels like it is cross treading.. will it work yeah, will it damage anything no, but I will probably mak a tool out of the old sensor that I probably wont ever use... I picked up cop disc / disc valve finally.. I'll install it in a few weekends. Just replaced the rear drop brake line.. Sum b, had to replace the brake end fitting as it rounded off. Clint __________________ 1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress

03-03-2020, 01:30 PM	#8
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: 81-87 rear brake circuit have residual check valve stock? Slightly off topic, but has anyone ever heard of anti-locking rear brakes on an 87? Any information on them? Just noticed it's on my window sticker. Attached Images __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

03-03-2020, 05:27 PM	#9
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,216	Re: 81-87 rear brake circuit have residual check valve stock? Rob, 88's had it standard, so it could have been an option in 87. I have never owned or driven an 87 so not sure. Newest square I have had was an 83. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

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