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Brake Lever return spring
I've been searching the archives and also the parts diagrams to see what might be missing/broken, but no luck.
My parking brake (emergency brake) works fine, with the exception that there is no return spring on the handle. So, when I release it, I have to push it to get it to go all the way down. The spring in this diagram (http://www.pelicanparts.com/catalog/images/pedals/diag/spring.jpg) is just to keep the button and ratchet mech 'out' - that is working fine. I'm looking for a spring to pull the handle down (and resist on the pull up). I thought this was just the way is was supposed to work until I drove another 911 recently. I did recently replace the shoes when I replaced the rear rotors, but it was acting like this before that. I don't see any return spring mechanism in the diagrams for the handle/lever - is it in the drums? Thanks, Craig
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'84 Carrera Coupe - B&B Headers and one-out muffler; K&N Cone intake; Steve Wong Chip; Euro height and corner balanced; 171K Miles (9/12) |
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12-16-2005, 10:30 AM
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,308
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The spring is in the drum, I believe. It is an interesting mechanism that is like a two-legged spider doing pushups on a mirror. I bet that the proper returning of the handle depends on whether those springs, in the drums are adjusted properly and whether the cables are sticking. I believe the cables should be dry. No wet lube. Another clue is that these park brake mechanisms can be adjusted so that the handle only comes up a couple of clicks before the brake starts to work. Five clicks should get you FULL brake.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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12-16-2005, 10:42 AM
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I wonder if that means I'm dragging my (new) parking brake shoes to death? I know that many disc brake systems have no concept of a return spring, and just rely on the 3 or 4 thousandth's lateral runout of the rotor to push them out as it rotates.
When I first installed the new e-brake shoes and rotors there was some rubbing, but I figured that would wear itself out after a bit of driving and it did. But, if the shoes are not really being released fully, they could be dragging. I don't think my cables are dragging, because it operates smoothly. However, I get only about 2 or 3 clicks before my e-brake is fully set - almost like there's no modulation, just on or off. At least I don't feel any resistance until it just seats "on". That's unlike my other vehicles. So, the spider spring actually has to push the drums out, thus forcing the cable to be pushed back forward? It seems like they'd want a spring on the lever to pull it back as well.
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'84 Carrera Coupe - B&B Headers and one-out muffler; K&N Cone intake; Steve Wong Chip; Euro height and corner balanced; 171K Miles (9/12) |
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12-16-2005, 11:29 AM
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,308
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Yes, the spider thing pushes the drums out, and the spring in the center returns everything to the "open" position, including the cable and hand lever. I think.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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12-16-2005, 11:43 AM
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ok, I guess it's possible my springs are weak and/or the cable(s) are dragging in the housings.
Is this (http://www.pelicanparts.com/catalog/images/brake_parts/brakes6b.gif) the "spider"? They refer to it as an expander. There is a spring in the middle and it's only $1.50 Couldn't hurt to replace them next time I have the rotors off.
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'84 Carrera Coupe - B&B Headers and one-out muffler; K&N Cone intake; Steve Wong Chip; Euro height and corner balanced; 171K Miles (9/12) |
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12-16-2005, 12:44 PM
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