Series 3 Brakes

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oddwriter

Member
Posts
23
Location
Scottish Borders
Having read many posts with brake bleeding problems I wonder if anyone has tried a minor mod?
I have an 1982 SWB with twin leading shoe on the front axle. Lots of posts suggest that bleeding this set up is difficult, so when I replace all the brake pipes I was thinking of routing the short pipe from the flexi to the BOTTOM wheel cylinder, then running a new pipe from the bottom cyclinder to the top one and also moving the bleed screw to the top cylinder.
In theory the air should be easier to get rid of with this arrangement.
Anyone tried it? Pros/cons?

Thanks
 
Just done it myself recently.

It shouldn't make a lot of difference to bleed efficacy which cylinder comes first - the really important thing is to remember the cylinders are gently tilted, so one port is higher than the other. You want the inlet to the cylinder using the lower port.

The upper port on the lower cylinder is a real bugger to get at. Setting it up with bleed nipple on the lower cylinder makes the nipple harder to get at, but simplifies the plumbing and assembly. You need to assemble the pipe into the cylinder before putting the cylinder onto the backplate. The other one's not easy, but not quite so bad.

I didn't have any bleed problems at all - I just let it gravity-bleed, and it did so happily.
 
Thanks for your comments. My thinking was that as air is lighter than the fluid, having the bleed nipple at the top cylinder would make it less sensitive to bleed.
Maybe I'll give the standard pipe route a try first, then if its awkward to bleed try the mod.
 
^^^^ What Adrian says. Gravity bleed, I have been doing it for 50 years 35 with Land Rovers and never encountered a problem bleeding brakes.
 
Thanks for your comments. My thinking was that as air is lighter than the fluid, having the bleed nipple at the top cylinder would make it less sensitive to bleed.

Within a cylinder, absolutely.
Between cylinders, doesn't make a difference.

Think about where the master is relative to the slaves. If the theory held, you'd be bleeding at the master, not the wheels/clutch.

Maybe I'll give the standard pipe route a try first, then if its awkward to bleed try the mod.

Try the lower cylinder in place, and have a look at where the bleed nipple sits relative to the hub...
 
Point taken.
I wonder why quite a few people have had bleeding problems then if gravity bleeding is the answer. Guess there are other problems in those cases.
Many thanks for all replies - really useful to have the ability to pick other people's knowledge and experience. Much appreciated guys and gals!
 
oddwriter, just make sure that you have some free play at the master cylinder pushrod.
 
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