90 Degree Caliper brake fitting? (1 Viewer)

[woytovich]

I'm not doubting the validity of the theory.

The hose they used on these is labeled DOT-GY-03/13-1/8-HL

Is this 1/8" hose? Is this the right or wrong hose given what you have said?

And again: given the 20" length of each hose is this something that will make any discernible difference (when compared to stock hoses)?

 

[60Works]

My local hydraulic shop swedged on brake fittings directly rather than use an AN elbow or a banjo. He had to bend the tube.



We had a little trial and error to get the length right so I had an extra too-long line and decided to use the angled fitting to replace the axle to frame line as well.

 

[ntsqd]

Only reason that I brought up the -4 issue is because of the post with links in it all looking to be -4 hose & fittings.

No idea about OE type hose. 1/8" seems like a reasonable guess to me. Likely that's the true ID if it does mean anything like that.

I did the calcs once just to see. The volumetric growth of 1/4" steel tube vs. that of 3/16" steel tube at the line pressure of a panic stop was rather dramatic. I don't recall any specific numbers, but let's say roughly a 30-40% difference (increase) in the change in volume for the 1/4" tube vs. that of the 3/16" tube. In other words, at the same pressure, the 1/4" tube grew a greater percentage than did the 3/16" tube. The specific numbers won't be the same, but the percentage change should be fairly linear for the different hoses in the two sizes.

 

[ntsqd]

Found the picture that I knew that I had, somewhere......

These are all screw-together hose ends and that is adhesive lined heat shrink over the braided SST/teflon hose as these were made before the covered braided SST hose was available. The hose end came as a 90°, no bending of anything by me.

 

[woytovich]

These are all screw-together hose ends and that is adhesive lined heat shrink over the braided SST/teflon hose as these were made before the covered braided SST hose was available. The hose end came as a 90°, no bending of anything by me.

So that is all 10mmx1 stuff? if so... where did you get it?

 

[ntsqd]

The adapter fittings are M10 x 1.0 Inverted Flare on the OE side and -3 AN on the hose side. I got it all from Ormebros.com They're in the north end of the San Fernando Valley, KA.

 

[JohninFla]

Why would the hose ID matter? The hose is solid and doesn't expand and the brake system is a sealed volume. The MC pushes a fixed amount of fluid and it pushes on the caliper pistons. In theory, non compressible fluid in a sealed system, you could run a 5 inch diameter pipe right? I am asking, I am no expert.

 

[ntsqd]

The theory is good, reality doesn't follow thru very well. Put your hand on a brake hose and then have someone simulate a panic stop. It is quite illuminating to do this simple test. Hint: It does grow in OD under pressure. How much is something that everyone should experience via this simple test. That growth translates into a 'mushy' feeling pedal. Older hoses will grow more than will new hoses, and braided SST hoses grow significantly less.

Once I did the math to predict the change in OD of 1/4" steel tube vs. 3/16" OD steel tube at the same pressure. The difference in resulting fluid volume was surprising. Reality does follow this math result, unfortunately.

And for the record while all liquids are considered "incompressible" the truth is that they all are slightly compressible to varying degrees. The compressibility is small, but it is there and its effects can sometimes show up, usually when its to your disadvantage.....