My 3 ton, a 1976 IH 1800 loadstar has a bit of an issue with a brake sticking on, happens to be the left (drivers side) front brake. I usually just crack the brake line from the master cylinder and the brake let's go. So I suspect I have a master cylinder issue, or could there be another cause? Truck has a vacuum booster (under the cab).
- Thread starter oj
- Start date
notjustair
Well-known Member
Yup. The hose has separated and collapsed internally. It will let pressure through to apply brakes but won't let it back to release pressure. Have Napa make you a line.
Janicholson
Well-known Member
If bleeding the line releases it, the restriction and repair issue must be between the point of your bleeding, and the booster, or in the booster. It probably has a Hydrovac booster. If there is a "T" in the lines going to the front brakes, and bleeding the other side, or a front wheel cylinder bleeder on either side releases it, it might have a broken return spring on the affected wheel. Jim
Steve@Advance
Well-known Member
So where are you cracking the line?
At the master cylinder on the firewall? If there is pressure building there, it would affect all the brakes, not just one... That can be either a sticking master cylinder, caused by rust and corrosion holding the cylinder from returning, or (worst case) oil has been put in the system and the rubber cups are swollen, or the linkage is out of adjustment not letting the cylinder fully return.
If you are cracking the line down at the left front wheel, then yes you have a collapsed rubber brake hose.
At the master cylinder on the firewall? If there is pressure building there, it would affect all the brakes, not just one... That can be either a sticking master cylinder, caused by rust and corrosion holding the cylinder from returning, or (worst case) oil has been put in the system and the rubber cups are swollen, or the linkage is out of adjustment not letting the cylinder fully return.
If you are cracking the line down at the left front wheel, then yes you have a collapsed rubber brake hose.
used red MN
Well-known Member
- Location
- Coon Rapids, MN
I must be living under a rock! NAPA can now make a brake hose just as they would a hydraulic hose--wow! That seems like it would have "liability" with a capital "L". They must have a way to pressure check the completed assembly. I would want to "A" know and trust the parts man making it for me or "B" be able to watch the entire process with my own eyes before I would consider that for any vehicle I'm working on.
Robert Major
Well-known Member
Hi used red. I bet there are no more liability issues than buying a junk hose from the land of almost right. I got a brand new manufactured steering hose for my GM truck in town . It lasted 3 weeks and blew out. I kinda mentioned it to the parts guy, he said that was the 6th one they sold that did it! so even a factory produced one might fail quick. I think after that the NAPA guy might do a better job!.
I had a similar issue in the past. What I found was that a steel clamp around the hose had grown enough rust between the clamp and the hose that it pinched the hose tight and would not let the disc brake pads retract. The pressure applying the brakes was enough to overcome the pinch. This would cause the pads to drag and overheat and warp the rotor and smoke the lining. The same thing could work with drum brakes as the shoe return springs would not be strong enough to retract the shoes with a pinched hose.
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