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As you know from my other threads I am working on the brakes of my Jag set up. In that process one of the things I will be doing is rebuilding the parking brake mechanism. One of the complaints I have herd about with these units is the brake sticking. make sense to me because the spring clip that is designed to position the halves of the parking brake can bend over time, especially when it is not spring steel like the ones I got in my kit... but that is a rant for a different post.... in fact a post I already made 
To improve this situation I initially thought of removing the spring clips and adding a compression spring to the bolt that connects the two parking brake halves together. this would allow the halves to compress when the parking brake is engaged, and then push back apart when the parking brake is no longer engaged. problem with this is if I remove the spring clip than the halves would be totally free floating and chances are one side would remain in contact with the rotor all the time reducing rotor and pad life and creating drag on the drive train. So that idea is out, but what if I keep the spring clip AND added the compression spring?? If I used a fairly stiff one I think it would go a long way to keeping the parking brake free of the rotor when the brake is not needed and add some much needed resistance to the spring clips. What do you think?? I threw an old spring I had, on to the bolt and took a picture just to give you an idea of what I am thinking about doing.
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doesn't any one have an opinion on this???
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Have you read up on the rear brakes, including the parking brakes, in Kirby Palms, "Experience in a Book"?
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I am very familiar with the brakes and rebuilding them, and I have looked at that write up. what I am after is opinions on weather or not adding an extra spring is a bad idea or not.
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Your compression spring may work, but why not use stock Jaguar parts as in this thread?
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by "stock parts" are you referring to the return spring pictured here??
I could easily do that but it is not quite the same thing. The purpose of the spring I am thinking of installing is to help keep the parking mechanism from sticking. as it get compressed the spring clips that align it can bend causing it not to release properly. I am hoping that by adding a stiff spring in there the spring clips will have a better chance to rebound and not bind up. that is the thinking behind the extra spring and why I put it where I did.
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Daze wrote:
by "stock parts" are you referring to the return spring pictured here??
I could easily do that but it is not quite the same thing. The purpose of the spring I am thinking of installing is to help keep the parking mechanism from sticking. as it get compressed the spring clips that align it can bend causing it not to release properly. I am hoping that by adding a stiff spring in there the spring clips will have a better chance to rebound and not bind up. that is the thinking behind the extra spring and why I put it where I did.
By all means, try your compression spring idea.
Yup, I believe the spring in the picture is a stock Jaguar part. If your compression spring works, you may not need this tension spring at all.
I read somewhere that a common Jaguar problem is for the cable clevis that retains the handbrake cable to spread apart in use, causing the clevis not to swivel within the lever. Have you ever heard of this causing premature wear of the cable and/or binding up the handbrake calipers?
Last edited by irstang (12/08/2010 9:10 pm)
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aw come on... I was looking for "thats a fantastic idea", "thats a good idea and here are some thoughts to make it better" or "thats a really bad idea and here is why..." not "By all means, try your compression spring idea." in other words, you go try it and if it works for you the rest of us can do it to 
Seriously though I appreciate the input and the efforts you made to help me. the more I think of it the more I think it is the way to go. The biggest problem I see with the OEM system is the normal return spring releases the pressure on the arm but the the non arm side relies completely on the spring clip and if it binds just a bit it will stick against the rotor. I am going machine or buy cups that will center the spring on the bolt. more to come as I get further along with this.
As an aside I spent the the better part of the other day machining new pad pins and a new adjuster bolt out of grad 8 hardware. I will start a new thread and post some pix when I have time to get them off of my camera.
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That does seem to be a flaw of the design. I'm not sure the extra spring where you are putting it is going to help very much, but even a little help could be just enough. since nobody has tried it and reported on it though the only way to know for sure is to try it. (Sorry!) The problem seems to be getting balanced spring pressure on both arms. The original bronze spring arms should be fine as long as everything else is perfect, so much for that idea.
I've only just begun looking into the possibility of using a modern rear brake caliper instead, but so far am very dis-satisfied with the mechanisms for retracting the mechanical adjuster during pad changes. Very few seem to have a positive means, and rotating the piston to retract it is a poor choice. Still watching for a good one though. That may be the ultimate answer.
JB
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I have only mocked up the calipers with the springs and have discovered there is a fine balance between having just enough spring and not having so much that it cause the parking brake adjuster to bind. As far as other calipers, I looked in to a couple other options (all of which had the piston retraction you do not like) and one of the biggest issues I found was getting the calipers to clear the center section.
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I'm not surprised. That could be a tough nut to crack. Next time I have a set of brakes apart I'll look at it again though, I wasn't real impressed with the original retractors, although otherwise the e-brake is not that bad. Just kinda weird.
JB
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What ever happened with this?
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