80LS1T Posted June 1, 2005 Share Posted June 1, 2005 I was just thinking tonight about how everyone hates the parking brake set ups on the 280ZX's. I was watching RIDES tonight on TV and when they put a front brake set up on the rear it eliminated the parking brake, it was all for show so they didnt really care but that got me thinking.... What if you installed a valve between the master cylinder and the line going back to the rear brakes? Then you could step on the brake pedal to apply pressure to the rear brakes, turn the valve closed, and then release the brake pedal. That should hold pressure on the rear brakes right? What do you guys think? Would this in theory work? Guy Quote Link to comment Share on other sites More sharing options...
Guest iskone Posted June 1, 2005 Share Posted June 1, 2005 That sounds like a line lock to me. As far as know a few guys use them it's evenwhat Dave at AZC suggests if you want a parking brake. If your talking about another set of calipers then look at live axle setups, start with Currie and if that doesn't work ask the guys at www.pro-touring.com Edit: Ok I remember what I was talking about now for a set of calipers. Well maybe not but here is what some live axle guys use http://www.wilwood.com/BrakeKits/Pages/10/index.asp Isk Quote Link to comment Share on other sites More sharing options...
Tim240z Posted June 1, 2005 Share Posted June 1, 2005 I have a line lock on my front brakes, and we all know how well that works as an emergency brake!!!!! Quote Link to comment Share on other sites More sharing options...
80LS1T Posted June 1, 2005 Author Share Posted June 1, 2005 I have a line lock on my front brakes, and we all know how well that works as an emergency brake!!!!! Heheheh, did you have yours on when "the incident" happend? If so what do you think happend? Did the pressure just bleed off? Guy Quote Link to comment Share on other sites More sharing options...
Tim240z Posted June 1, 2005 Share Posted June 1, 2005 I don't want to talk about it!. Yes, it was on. Could have bled off, but I think it was my fault for not pumping up the brake pressure enough. Quote Link to comment Share on other sites More sharing options...
jaime240z Posted June 1, 2005 Share Posted June 1, 2005 Tim, do you have an actual line-lock kit like the ones used for drag staging, or the park lock type that the AZC brake kit comes with? Just curious.... Quote Link to comment Share on other sites More sharing options...
Tim240z Posted June 1, 2005 Share Posted June 1, 2005 I have a line lock, electronic solenoid. Drag racing type, I suppose. Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted June 1, 2005 Share Posted June 1, 2005 Line locks function but they are not legal on the street in most states. Why? If there were a hydraulic failure (leak, etc.) the brakes no longer hold. All parking brakes are mechanical for that reason. Quote Link to comment Share on other sites More sharing options...
Cody 82 ZXT Posted June 1, 2005 Share Posted June 1, 2005 I think this was discussed before a month or two back. Someone mentioned that the proublem with using a line lock was that the calipers were not designed to hold pressure for an extended period of time. Anyone have any experience with this? Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted June 1, 2005 Share Posted June 1, 2005 any pressure that can last 24 hours on a caliper piston seal is a bad idea. No matter how nice of seals you got eventually something is going to leak. Any way line lock i would assume is okay if you set it low. But the reason you dont want to get rid of a parking brake is b/c parking brakes mechanically push the piston against the disk. Ive had e-brake cables snap just for normal use.... so if you use line lock make sure you leave that **** in 1st or R! and yes i would make my e-brake on the front in that case, for burn outs . Quote Link to comment Share on other sites More sharing options...
2126 Posted June 1, 2005 Share Posted June 1, 2005 Interesting statement about pressure on a caliper for 24 hrs. Should not be a problem! Brake systems are nothing more than a basic hydraulic system. I would think, that if your calipers are leaking after 24 hrs of pressure, you may want to rebuild them. Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted June 1, 2005 Share Posted June 1, 2005 this is true. I was just trying to kind of point out that the calipers were designed to apply pressure for a relatively small amounts of time. I would think that having many psi on the piston seals for consecutive days would not do good things as far as keeping the fluid in. Even if it only leeks one drop after a month or two, thats still to much for me . But as far as using it as a parking brake, elimitinating the mechanical option in case of brake failiure for whatever reason doesnt seem to make sense to me Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted June 1, 2005 Share Posted June 1, 2005 Interesting statement about pressure on a caliper for 24 hrs. Should not be a problem! Brake systems are nothing more than a basic hydraulic system. I would think, that if your calipers are leaking after 24 hrs of pressure, you may want to rebuild them. 24 hours maybe, but 48? 72? Brake fluid is incompressible so even a drop or two of leakage, or temperature changes, can cause the calipers to relax. I would imagine the problem is vastly compounded by stainless steel brake lines since you will no longer have the flex in the rubber lines to maintain the pressure. Line locks are good for burnouts, but IMO there are an extremely bad idea for anything else. Don't try to use them for a parking brake. Also I don't think anyone is purposely eliminating mechanical parking brakes. The problem is a number of big brake kits don't have any provisions for a parking brake. Quote Link to comment Share on other sites More sharing options...
arizonazcar Posted June 1, 2005 Share Posted June 1, 2005 This is an excerpt from my Brake kit FAQ's page http://www.arizonazcar.com/brakekitfaqs.html'>http://www.arizonazcar.com/brakekitfaqs.html Question: Why don't your kits include an emergency brake? Answer: Nissan's have never been equipped with an emergency brake.....they have a parking brake. Question: Same thing aren't they? Answer: No not at all, An emergency brake means that if you're going 65 MPH down the road up to a red light and you have complete failure of the front brakes and also complete failure of the rear brakes you can pull the emergency brake and stop in time before the intersection. If you believe the hand brake will stop you in that situation then ..........tooth fairy, Brooklyn bridge, check's in the mail (pick one). There were emergency brakes on cars in the 1920's Question: How about a parking brake then? Answer: I have a hydraulic line-lock to serve the parking brake function. Question: But I live in San Francisco and have to park at the top of a hill pointed downhill and I go out of town for a month at a time. Answer: Get a brick. http://www.arizonazcar.com ARIZONA Z CAR 2043 E. QUARTZ ST. MESA AZ 85213 Phone 480-844-9677 E-mail dave@arizonazcar.com Dave Quote Link to comment Share on other sites More sharing options...
Tim240z Posted June 1, 2005 Share Posted June 1, 2005 Answer: Get a brick. Yup...my solution! Quote Link to comment Share on other sites More sharing options...
Here comes trouble Posted June 1, 2005 Share Posted June 1, 2005 Chuck Beck who builds a highly successful replica of the 550 Porsche Spyder places an inline brake lock that leads to the rear drum brakes.. This is not a legal parking brake and over a period of time dependability maybe sacrificed.. In theory a great idea but in practice.........................................a poor substitute for a permanent parking brake.........Tim do not flair those fenders.......................get another body Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted June 2, 2005 Share Posted June 2, 2005 ok fine i would suggest a mechanicle parking brake not emergency brake Quote Link to comment Share on other sites More sharing options...
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