dafix
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Posts: 76
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Post by dafix on Oct 21, 2022 12:47:09 GMT
Hello, I am trying to replace the front-right brake wheel cylinders of my DAF 46. I am stuck with the removal of the flexible hose from the brake line (required step in order to not twist and damage the hose when removing it from the wheel cylinder, according to the manual). I am indeed using a special brake spanner (hexagonal shape with a slot to insert it around the line) for the fitting of the line, but I cannot figure out how to hold the hose end (it has no hexagonal shape). I have tried various types of pliers, but none gives me enough grip. Spraying WD40 on the thread of the fitting didn't help. Also, the connection is behind the suspension strut and there is little angular clearance for the brake spanner (therefore I would need to turn the hose end, at least to loosen the connection), which makes things difficult. Here are some pictures. If anyone already managed to to remove a hose like that, I would be curious to know how to proceed.   |
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Post by bobdisk on Oct 21, 2022 16:00:20 GMT
Never seen a hose end like that before, it looks like its either a spline and either needs a very special tool, or more likely its been rounded off somehow. What do the others look like? If the hose rubber is a bit perished, I would sacrifice it and use mole grips to hold it, and put a new one on. The metal pipe end going into the joint does not look very good, looks rusty.
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andrew
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Posts: 1,123
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Post by andrew on Oct 21, 2022 16:43:12 GMT
I agree with Bobdisc's comments-that fitting does look an odd one! I don't know if this will help you, but when changing the flexible brake pipes on my 33 I found it easier to loosen, but not completely undo, the pipe from the cylinder, then, with the hub removed, the bleed nipple unscrewed and the shoes unclipped from it, rotate the cylinder to release it from the pipe. When you fit the new flexible pipe at the rigid pipe junction, pass the new flexible pipe through the opening in the brake backplate and then wind the cylinder onto the pipe. This removes the complex problem of the flexible pipe becoming twisted and gives you the opportunity to tighten the pipe onto the cylinder in a more accessible place than the back of the brake plate!
As I say, this works on a 33, and I'm not certain it'd be the same on a 44/46, but I shouldn't be surprised if it were.
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dafix
Likes DAFs
Posts: 76
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Post by dafix on Oct 22, 2022 9:16:42 GMT
Hello,
Thank you for your tips, I have tried the method (loosening the hose from the cylinder, then remove the cylinder from the backplate and rotate the cylinder to unscrew it) that you described, Andrew, and it worked fine. Thank you very much  ! The only tricky part was to remove the bridge pipe between the cylinders (as you may know, the DAF 46 has a Girling dual-cylinder system for the front brakes) with the hose still connected: using carefully a normal 11-mm spanner and doing it slowly it was OK. I have mounted the new cylinders and I am going to mount the new brake shoes. I preferred to leave this weird hose installed, since I haven't find a way to remove it from the brake line upstream and I don't want to damage the pipe fitting (which is already a little rounded off). |
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! The only tricky part was to remove the bridge pipe between the cylinders (as you may know, the DAF 46 has a Girling dual-cylinder system for the front brakes) with the hose still connected: using carefully a normal 11-mm spanner and doing it slowly it was OK. I have mounted the new cylinders and I am going to mount the new brake shoes. I preferred to leave this weird hose installed, since I haven't find a way to remove it from the brake line upstream and I don't want to damage the pipe fitting (which is already a little rounded off).