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post #1 of 6 Old 04-21-2014, 01:11 AM Thread Starter
foxy1305
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Brake problem

My brakes are grabbing on the offside front making the wheel look up under only moderate braking. Any ideas for a cure

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post #2 of 6 Old 04-21-2014, 08:18 AM
angelo2975
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Originally Posted by foxy1305 View Post
My brakes are grabbing on the offside front making the wheel look up under only moderate braking. Any ideas for a cure
check your calipers operation make sure they're not binding,also inspect the brake lines. if they collapsed internally they will act as a one way check valve (fluids will flow out to the caliper but wont let it return to the master Cylinder)


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post #3 of 6 Old 04-21-2014, 08:27 AM
mrblaine
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Originally Posted by angelo2975 View Post
check your calipers operation make sure they're not binding,also inspect the brake lines. if they collapsed internally they will act as a one way check valve (fluids will flow out to the caliper but wont let it return to the master Cylinder)
Why does a line internal collapse always turn into a check valve that only stops fluid from going back to the master? Why doesn't turn into a check valve that stops fluid from going to the caliper?

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post #4 of 6 Old 04-21-2014, 08:35 AM
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Why does a line internal collapse always turn into a check valve that only stops fluid from going back to the master? Why doesn't turn into a check valve that stops fluid from going to the caliper?
I never said always...from my experience, I've run across a few that failed in the pressure side of the stroke. I ran across a handful that failed on the relief side.


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post #5 of 6 Old 04-21-2014, 08:51 AM
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I never said always...from my experience, I've run across a few that failed in the pressure side of the stroke. I ran across a handful that failed on the relief side.
Fair enough. One of my bigger pet peeves are the "experts" on brakes misleading the public with misinformation. I found this one this morning.

Braided Steel Brake Lines. Myth and Reality.
There’s a lot said about rubber lines “swelling” and causing a soft pedal. While this can happen in older cars, it’s not the primary gain from upgraded brake lines. Yes, the Teflon tube wrapped with braided steel has a much lower swell than rubber and textile lines. The firmer pedal that is so immediately apparent is mostly from the smaller inside diameter of the Teflon lines. Since the Teflon is more rigid, you can get away with a smaller diameter without increasing the risk of collapse. This means that you actually need to move less brake fluid to achieve the same application of brakes. The result? A more responsive pedal with greater feedback.


Sounds great, right? The problem is the exact same amount of fluid will need to be moved to get the caliper pistons to move the exact same distance as before. Rubber and textile flex hoses are built to withstand 3000 psi and don't flex larger in diameter any more than SS braid and Teflon do.

I've tested both on the same vehicle with a hydroboost I installed that had a line pressure output to the front calipers of 2800 psi. Both hoses flexed open or larger in diameter the same amount, about 1/2 of 1/1000".

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post #6 of 6 Old 04-21-2014, 08:59 AM
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Originally Posted by mrblaine View Post
Fair enough. One of my bigger pet peeves are the "experts" on brakes misleading the public with misinformation. I found this one this morning.

Braided Steel Brake Lines. Myth and Reality.
There’s a lot said about rubber lines “swelling” and causing a soft pedal. While this can happen in older cars, it’s not the primary gain from upgraded brake lines. Yes, the Teflon tube wrapped with braided steel has a much lower swell than rubber and textile lines. The firmer pedal that is so immediately apparent is mostly from the smaller inside diameter of the Teflon lines. Since the Teflon is more rigid, you can get away with a smaller diameter without increasing the risk of collapse. This means that you actually need to move less brake fluid to achieve the same application of brakes. The result? A more responsive pedal with greater feedback.

Sounds great, right? The problem is the exact same amount of fluid will need to be moved to get the caliper pistons to move the exact same distance as before. Rubber and textile flex hoses are built to withstand 3000 psi and don't flex larger in diameter any more than SS braid and Teflon do.

I've tested both on the same vehicle with a hydroboost I installed that had a line pressure output to the front calipers of 2800 psi. Both hoses flexed open or larger in diameter the same amount, about 1/2 of 1/1000".
I've been iffy about doing the steel braid option due to not being able to see the condition of the rubber line over time,I like to keep an Eye on them for dry rot or cracking.


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