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#1 |
Registered User
Join Date: Mar 2022
Location: Surrey BC
Posts: 805
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Rust jacked brake hose
I'd heard of this but never had first hand experience.
Vehicle is off topic, a '91 Z28 but this could happen on any vehicle including our old trucks. It drove and stopped well, except hard braking at highway speeds it was all over the road. Suspension and alignment was gone through and problem persisted. Pressure bleeding brakes, one side spurted out, one just dribbled. Removing that hose you could not blow through it, 125 PSI from compressor made fluid lethargically drip out. On dissection the hose was rust jacked under the control arm mount. This was not a rusty car by any means and both hoses looked Ok rust wise. Hose from other side for visual comparison, it is also partially occluded. This is cut open with razor knife, no material was removed in cutting. Almost 100% closed off! New front brake hoses and no other changes, now it stops straight at speed. Something to think about. |
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#2 |
Registered User
Join Date: Oct 2013
Location: Alabama
Posts: 1,220
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Re: Rust jacked brake hose
what is "rust jacked" ?
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#3 |
Registered User
Join Date: Mar 2022
Location: Surrey BC
Posts: 805
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Re: Rust jacked brake hose
oxide/rust expansion causing deformation
in this instance it did not take much expansion under the crimped area to force the hose closed google truck frame rust jacking or concrete rust jacking for more common instances. it may go by other names as well |
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#4 |
Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,357
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Re: Rust jacked brake hose
Very interesting. So the brake hose bracket was actually pinching the hose closed? due to rust on the bracket?
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76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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#5 |
Registered User
Join Date: Mar 2022
Location: Surrey BC
Posts: 805
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Re: Rust jacked brake hose
yes, rust between the swaged on bracket fitting and the hose
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#6 |
Senior Member
![]() Join Date: Jun 2002
Location: Murray, Kentucky
Posts: 3,483
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Re: Rust jacked brake hose
I've had it happen on a couple of squarebody trucks. Sometimes it will get worse as you drive and then finally locks up.
Never cut one apart but I'm sure it was the same problem.
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Roger '68 Short step - https://67-72chevytrucks.com/vboard/...d.php?t=849675 '69 ('70?) 2wd Blazer '70 GMC Jimmy 2wd '73 Firebird - https://67-72chevytrucks.com/vboard/...d.php?t=853203 |
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#7 |
All about them K’s
![]() Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,377
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Re: Rust jacked brake hose
My Iroc-Z had some rust starting on those same brackets but it wasn’t bad enough to pinch the hose yet. I changed all the brake hoses before I put it back on the road.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's ‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue ‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0 ![]() |
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#8 |
Senior Member
![]() Join Date: Sep 2014
Location: Wenatchee, Wa
Posts: 910
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Re: Rust jacked brake hose
Great pics and explanation thank you! Most folks don't flush/replace brake fluid etc but imho it should be done every 50k at least.
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#9 |
Born Psycho
![]() Join Date: Feb 2001
Location: brentwood,cal,usa
Posts: 4,882
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Re: Rust jacked brake hose
we see that happen at the shop where I work, sometimes it will allow fluid to pass through the hose to the caliper but won't allow the caliper to release since no pressure going backwards. easy way to confirm if it's a caliper sticking or the hose not allowing it to release, just open the bleeder, if fluid squirts out and the rotor turns freely afterwards the hose is bad, if the rotor won't turn and no fluid squirted out the caliper is sticking. if you're still not sure replace both of them, better to be safe than sorry with the braking system.
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jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA |
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