Parking brake installation.

[gerryg]

Gerry, I'll PM you a link to some "raw" video. It has the part numbers, but some of the final tips and tweaks will be in complete. It seems I present a couple of the challenges, but don't get into the details of how I finished it--namely, there's a couple springs that need some coils cut off and I don't tell you how many. I'll see if I can figure out what I did later.

Paul, thanks! That tells me most things I need to know for now.

For the other side, do I get the same part numbers? I see that Dorman seem to have LHS and RHS versions of many of their cables.

 

[pvfjr]

Paul, thanks! That tells me most things I need to know for now.

For the other side, do I get the same part numbers? I see that Dorman seem to have LHS and RHS versions of many of their cables.

Yes, you'd do the same thing on both sides. The long intermediate cable that passes through the frame rail on both sides will need to be custom (cable clamps and whatnot, unless you can figure out an exact replacement that fits the bill).

 

[nighthawking]

Gerry, I'll PM you a link to some "raw" video. It has the part numbers, but some of the final tips and tweaks will be in complete. It seems I present a couple of the challenges, but don't get into the details of how I finished it--namely, there's a couple springs that need some coils cut off and I don't tell you how many. I'll see if I can figure out what I did later.

Me too if you will. Thnx.

 

[gerryg]

Yes, you'd do the same thing on both sides. The long intermediate cable that passes through the frame rail on both sides will need to be custom (cable clamps and whatnot, unless you can figure out an exact replacement that fits the bill).

Paul, I've been thinking about how that cable equaliser works. It's clever but seems to behave quite differently from the original.

In the original setup, a 1" movement of the intermediate cable causes a 1" movement of each of the 2 connected cables within their sheathes because both sheathe ends are fixed.

With this new equaliser it looks like a 1" movement of the intermediate cable will only cause a 1/2" movement of each of the 2 connected cables relative to the their sheathes because the equaliser will also move forward 1/2".

That would mean that the intermediate cable will need to be pulled twice as far to get the same braking effect. Am I picturing this correctly and does it matter?

 

[pvfjr]

Paul, I've been thinking about how that cable equaliser works. It's clever but seems to behave quite differently from the original.

In the original setup, a 1" movement of the intermediate cable causes a 1" movement of each of the 2 connected cables within their sheathes because both sheathe ends are fixed.

With this new equaliser it looks like a 1" movement of the intermediate cable will only cause a 1/2" movement of each of the 2 connected cables relative to the their sheathes because the equaliser will also move forward 1/2".

That would mean that the intermediate cable will need to be pulled twice as far to get the same braking effect. Am I picturing this correctly and does it matter?

Yes, you're correct. The old equalizer can provide twice the travel, but with half the tension. With uneven wear of shoes, I figure that having them travel "together" didn't really pan out. I'm banking on the fact that with precise adjustment, real equalizing over time, and reduced friction at multiple points, I can eliminate much of the slop and have effective parking brake function even with 1/2 the travel. I think much of the travel in the old setup was wasted with all the friction points.

I should probably mention this fact in the video if I get around to it. I need to finish up my cable routing so I can complete the video though. I ended up in a rush at the end and ended up reusing those redirection hooks where the intermediate cable passes through the frame. Eliminating those was one of my main goals, so I'm not quite "done" yet. But, I do have a working parking brake at the moment, which is nice since I found out my parking pawl is garbage.

 

[gerryg]

Yes, you're correct. The old equalizer can provide twice the travel, but with half the tension. With uneven wear of shoes, I figure that having them travel "together" didn't really pan out. I'm banking on the fact that with precise adjustment, real equalizing over time, and reduced friction at multiple points, I can eliminate much of the slop and have effective parking brake function even with 1/2 the travel. I think much of the travel in the old setup was wasted with all the friction points.

Is it possible to regain some travel by using pulleys at the front centre of the intermediate cable?

 

[pvfjr]

Is it possible to regain some travel by using pulleys at the front centre of the intermediate cable?

It's possible. The length of the intermediate cable and the front cable comes into play too. The point where the front cable attaches to the intermediate cable bends the intermediate at a slight angle. The actuation ratio and force ratio is determined by the sine of that angle. Shortening the front cable and lengthening the intermediate changes this angle, and changes the actuation and force ratios as a result. I haven't gotten down in the weeds there yet, but I might later on if it seems necessary.

 

[pvfjr]

Me too if you will. Thnx.

I decided to break things up so people don't have to wait for the whole thing. So, with minimal effort, here's part 1.

 

[pvfjr]

And here's what I had to cut off: