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TR4a IRS Rear Brake Pipe Routing


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I'm replacing the rear brake pipes and have noticed that the way they are routed on the Trailing Arm is different on each side. The difference occurs where the rigid pipe goes underneath the handbrake cable, on one side it goes under in front of the handbrake cable mounting block, and on the other side it is behind the block. I'm afraid I can't get to the car to take a photo at the moment but I hope this description makes sense to someone.

 

I'd like to know which is the correct way to route the pipe and if anyone has a photo of their Trailing Arm that would be great. It may not make a difference which way they go, but I worried there's a chance of wear against the pipe if I get it wrong.

 

Thanks, Mark

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Hi Mark,

see attached pic. The pipe goes under the the HB cable and in front of the bump stop pad.

 

It may be better to take the pipe around the bump stop pad on its rear side and approach the wheel cylinder in a straighter alignment - pipe still under the HB cable.

 

Roger

 

 

 

 

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The routing is the same on my 4A but is that a dob of JB Weld I spy Roger, where the pipe traverses the mounting feature on the trailing Arm? I notice that you have a gizmo to improve the handbrake operation - does it make a difference?

 

Tim

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Hi Tim,

a few experiments.

The blob is RTV. The pipe is unsupported between flex pipe and the slave cy. So a blob keeps it happy.

People have a concern over copper pipe work hardening, so reducing any flexing is a good thing.

 

The contraption is my version (prototype mode) of the HB extenders you get on ebay (before the ebay ones were available).

Yes they do work very well. If you haven't got any fitted then treat yourself to the ebay items.

 

Roger

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Mine run like Rogers. Getting that bend right up against the flare nut isn't easy. I used a kit to repipe my brakes and I don't think there would have been enough length in the pipe to allow it to go round the back of the bump stop pad. A custom made pipe would probably work though. There are no problems with the hand brake lever coming into contact with the pipe in the current setup. If you're interested in the eBay lever extenders, they're really nicely made and are usually advertised as being for the Stag but they fit all the IRS cars.

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OK Roger. Actually on my car I have repositioned the compensator link on the handbrake some 7/16" nearer to the fulcrum pin. With correctly adjusted cables the increased mechanical advantage from this dodge gives a much improved handbrake operation for free. if I only knew how the hell to attach an image to this post I would! I manage to do it on C.T. forum posts but am a real klutz with a computer

 

Tim

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Hi Tim,

I also have the moved comp link. The extenders give about 30% increase in leverage but the comp link reposition nigh on doubles the leverage.

 

To get your pics uploaded.

Click on 'more reply options - bottom righthand corner

Click on 'choose file' - bottom lefthand corner

Select from your own files what you want.

Click on 'attach this file - bottom left (you can upload a number of files at this time)

Position the cursor where you want the pic(s)

Click on 'add to post' bottom right side.

 

NOTE - you only have 1.9Mb of pic space. Reduce your pics to 100Kb and you will be OK.

 

Roger

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The pipe from flexi to cylinder should be clipped to the edge of the trailing arm. Part number 615836 Unfortunately those clips have been NLA for years.

Stuart.

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post-9073-0-70988200-1417016829_thumb.jpg

 

Thanks for the lesson Roger -- let's see if it works now. The 1.95mB allowance is very generous I would like the opportunity of comparing my handbrake action with yours sometime.

 

Tim

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