Front discs dragging! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

stllookn · 11-03-2002, 03:44 PM

Just installed a new mastercylinder and old power booster. The booster did not have an acctuator rod so I pulled one out of an older assy. I just read in the rebuild manual that the length of this rod is critical and must be measured with a "go/no go" gauge. I did not do this so wondering if this is the problem.

tom hand · 11-03-2002, 03:49 PM

Jack up the front of the truck, and rotate the wheels. If you can feel a drag, loosen the nuts on the mastercylinder and pull it away from the booster. If the drag goes away you found your problem. I have also seen new mastercyclinders right out of the box be defective and do this. Good Luck

**68 Stepside** · 11-03-2002, 04:01 PM

I'll bet Tom is correct in his assumption that the brakes will loosen up, when you pull the booster away from the firewall. I know for a fact that the rods vary in length, so you might just have to pull the booster away, measure the difference in relation to the firewall, and take some length out of the rod. I'm sure I"ve made this reply clear as mud, but I hope it helps in some way...lol

TJ

stllookn · 11-03-2002, 04:07 PM

Thanks guys...I'll bet I can put a shim between the booster and the mastercylinder and it would loosen up too...thanks again. I will try that now.

stllookn · 11-03-2002, 04:44 PM

I put a 0.075 washer between the MC and the booster and it seems to have solved the problem. Thanks for the help!

11-03-2002, 03:44 PM	#1
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	Front discs dragging! Just installed a new mastercylinder and old power booster. The booster did not have an acctuator rod so I pulled one out of an older assy. I just read in the rebuild manual that the length of this rod is critical and must be measured with a "go/no go" gauge. I did not do this so wondering if this is the problem. __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

11-03-2002, 03:49 PM	#2
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	Jack up the front of the truck, and rotate the wheels. If you can feel a drag, loosen the nuts on the mastercylinder and pull it away from the booster. If the drag goes away you found your problem. I have also seen new mastercyclinders right out of the box be defective and do this. Good Luck __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

11-03-2002, 04:01 PM	#3
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,690	I'll bet Tom is correct in his assumption that the brakes will loosen up, when you pull the booster away from the firewall. I know for a fact that the rods vary in length, so you might just have to pull the booster away, measure the difference in relation to the firewall, and take some length out of the rod. I'm sure I"ve made this reply clear as mud, but I hope it helps in some way...lol TJ __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

11-03-2002, 04:07 PM	#4
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	Thanks guys...I'll bet I can put a shim between the booster and the mastercylinder and it would loosen up too...thanks again. I will try that now. __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

11-03-2002, 04:44 PM	#5
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	I put a 0.075 washer between the MC and the booster and it seems to have solved the problem. Thanks for the help! __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)



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