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Username Post: Brake lines        (Topic#375300)
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 26062
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
07-07-24 09:00 AM - Post#2871545    

Has anyone replaced all their brake lines? Especially the rear line? I helped do some work on a '82 K20. The owner couldn't get brake fluid to the rear. We opened line fittings one at a time working forward. No fluid at all at the rear split, flex hose, or first mid body connection. The line was rusted up inside. We broke it off while trying to separate the line at the mid frame union. The line was replaced at the union to the rear split. A new flex line was installed. Still no fluid. We opened the line fitting on a new proportion valve. Fluid did come out. The rest of the line will be replaced. The inside is rusted from moister. It was left without fluid for too long.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
bobb 
Super Senior Member
Posts: 6683

Loc: paradise
Reg: 09-05-03
07-07-24 11:14 AM - Post#2871555    
    In response to gchemist

uh, if the lines are that bad, the rest of the system may be ready to fail also.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
Shepherd 
Valued Contributor
Posts: 3439

Loc: Lake George, NY
Reg: 11-11-15
07-07-24 11:31 AM - Post#2871557    
    In response to gchemist

The shuttle valve in the proportioning valve can close off fluid to the rear, if pressure is lost in the rear. Plenty of info on the net how to bleed the rear brakes if this happens.



Edited by Shepherd on 07-07-24 11:32 AM. Reason for edit: No reason given.

 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 26062
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
07-07-24 01:53 PM - Post#2871561    
    In response to Shepherd

The front lines and flex hoses have been replaced. Calipers and brakes pads are new. The proportion valve was changed to see if fluid would flow back. Fluid comes out at the valve. We couldn't blow air through the remaining stock line. A new line will be bent and installed. The truck comes from a coastline. I would replace all the brake lines. Rear wheel cylinders and brakes are new.

Here's the interesting part. The K20 was originally a diesel. It's now a 350 SB truck. The hydro boost brake set up is in place and connected.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
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