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02-09-2021, 12:22 PM
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#1 |
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Registered User
Join Date: Dec 2019
Location: PALMETTO BAY
Posts: 46
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86 Suburban R20 strange linkage ?
AS I am working to remove the old fuel tank, I noticed a strange linkage over the rear end that looks like it has something to do with rear hydraulic brakes ?? Rear brake lines stop at one end of the linkage...then continue from rear of linkage to wheel cylinders. WTF is this about ? Some type of booster for rear brakes ? This baby has a 411 rear end and is set up for heavy towing (oil cooler and towing package). Anyone else ever see this...came this way from factory...not added on.
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02-09-2021, 03:02 PM
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#2 |
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Senior Member
 Join Date: Mar 2003
Location: Colfax-California
Posts: 8,634
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Re: 86 Suburban R20 strange linkage ?
Can you throw a pic in here of it. Sounds like it may be a no load anti skid deal
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02-09-2021, 03:48 PM
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#3 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,226
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Re: 86 Suburban R20 strange linkage ?
Yes - it is a height sensing valve that limits the rear braking in an unladen condition.
Loading the vehicle causes the rear ended to go down, trip the valve open and allow full line pressure to the rear brakes. Think of it as a primitive mechanical antilock braking system.
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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02-10-2021, 03:48 PM
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#4 |
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Registered User
Join Date: Dec 2019
Location: PALMETTO BAY
Posts: 46
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Re: 86 Suburban R20 strange linkage ?
Wow...I guess that is part of the 1986 super towing package...this truck is a beast and would probably have enough torque to tow my house ! I am willing to bet that is why I had trouble bleeding the rear brakes when I put the new master cylinder and front calipers/hoses in ! How can I determine if that rear brake linkage system is still working ?
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02-10-2021, 04:05 PM
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#5 | ||
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,226
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Re: 86 Suburban R20 strange linkage ?
Quote:
https://www.gmheritagecenter.com/doc...t-Suburban.pdf Quote:
Or - just remove it entirely. It was basically a test beater to pass FMVSS brake testing. K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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02-10-2021, 04:09 PM
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#6 | |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,226
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Re: 86 Suburban R20 strange linkage ?
Quote:
https://www.gmheritagecenter.com/doc...t-Suburban.pdf K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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