Replacing solid brake lines with flexible hoses

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Jonathan Kay
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... what, if anything, is the advantage to changing to flexible hoses?

It feels all wrong that the safety critical pipes and junctions undergo mechanical loads without some flexibility.

But I have no idea how often it causes a problem in practice.

Previous discussion.

Jonathan

simon_h
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Changing to flexis, even just at the allows the sliding calliper to do just that. It's restricted by the solid pipes going to it. 

When I put a 7 into IVA a couple of years back it was put as a note that it has solid pipes. Apparently it is (or was) an ongoing discussion between vosa and cc as vosa don't agree with it. 

Aeroscreens
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Job done this week end. Having inspected the old solid lines they still look in perfect condition not bad considering they're are nearly 26 years old. As has been mentioned before the inner pads wear much more than the outers as with fixed lines the caliper appears not to slide. My outers looked almost unworn after 21k miles/8 years.

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John Vine
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When I put a 7 into IVA a couple of years back it was put as a note that it has solid pipes. Apparently it is (or was) an ongoing discussion between vosa and cc as vosa don't agree with it. 

It hurts to say this, but I suspect the problem is that CC tend not to appreciate external criticism of their engineering. 

It rather reminds me of the time, 14 or 15 years ago, I drew CC's attention (together with compelling evidence, I might add) to a design flaw in the way clutch release bearing (CRB) pre-load was implemented on cable-clutch cars, and pointing out that the shortcoming could well lead to premature CRB failure (or worse).

Rather than responding “hey, that’s an interesting hypothesis, we’ll look into it and let you know”, they replied to the effect that they’ve been doing it that way for years without significant problems.  So, it was revealing when, soon afterwards, they decided to change to a different CRB rather than fix the basic engineering.

PS: I'm 100% with VOSA on the brake-pipe issue.

JV

Tazio
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Chris, Any pics of the final result??

Aeroscreens
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Alan, Now you ask Rolleyes Biggrin ....

No photos but I'm hoping to change the brake fluid (what's left) and bleed the brakes during the week so I'll post some piccies then. Currently new hoses follow the same path as the rigid lines i.e. under the radius arm (I don't have Watts Links)

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Tazio
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Thanks Chris, be good to see them.

7 wonders of th...
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I routed mine around the back of the radius arms, also used banjo unions for a better fit though this was down to a caliper change.

You could always use the SV hoses on an S3 ...?

elie boone
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I am all for flexible hoses but a simple cure with solid brake lines would be to have a loop in the solid brake line close to the caliper.

p.mole1
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I made my own hoses but put some heat shrink onto any parts that come into contact with any painted surfaces.

I would also use a fitting on the end of the solid line to retain the brake fluid in your system when you disconnect it from the tee piece.

Also when bleeding the system I bleed the air out by loosening the fitting on the caliper to remove the air from the brake line to avoid getting air trapped in the caliper.