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roy4matra
YaBB God
Posts: 1211
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« Reply #286 on: April 25, 2020, 09:22:13 am » |
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Wouldn't it be easier to make up a normal metal brake pipe with a short flexible hose at the rear by the engine? I would think that the threads in the master cylinder and the slave cylinder would be the same as in the braking system?
Not quite Terry. You can indeed use a normal brake type tubing, and is what I plan on my own car, but although you would use the same 4.75mm copper nickel as you do for the braking system, the threaded holes in the master and slave cylinders are not the normal M10x1.00 but are actually M12x1.00 mm! This is to allow for the larger plastic pipe (7mm o/d as stated). So you need special flare nuts that are M12x1.00 but with only a 4.75 mm hole for the pipe. Also you have the problem that the seat for the normal nipple end of the pipe is not in the master or slave cylinders. These have been made to suit the plastic pipe and rubber seal, so the bore inside has a flat surface instead of a conical face. An alternative is to use some thread adapters from M12x1.00 down to M10x1.00 and then make up the brake pipes as normal - except that whilst all the brake pipes have metric DIN flare ends, the only thread adapters I can find here, have conical bubble seats, so you would have to make this pipe up with SAE bubble flare ends. As for the flexibility required, obviously some are too young (or older ones have forgotten) how we used to fasten capillary water temperature gauges and oil pressure gauge pipes when these were mechanical not electric! You don't need a flexible section - you simply make a couple of circles of the tubing approx 50mm dia. between the last fixing point of the pipe and where it fastens to the slave cylinder! These couple of coils allow the small movement necessary without stressing the tubing. (and Matra used a plastic pipe not for flexibility which we always knew how to cope with, but for cheapness - everything done that is worse today, is to reduce costs!) Roy
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« Last Edit: April 25, 2020, 11:26:25 am by roy4matra »
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