shadow1752 Posted June 25, 2015 Report Share Posted June 25, 2015 What is it and what was it for? crawling around underneath I noticed a line with a flare fitting going to nowhere and pinched off, traced it back to this thing, What is it and what was it for? Removed 1 Quote Link to comment
MicroMachinery Posted June 25, 2015 Report Share Posted June 25, 2015 Looks to me like a proportioning valve for the brake system. 1 Quote Link to comment
shadow1752 Posted June 25, 2015 Author Report Share Posted June 25, 2015 Knew it had something to do with the breaking system, wonder why it was deleted, Main reason I was tracing lines is I'm losing break fluid at a pretty quick rate.... think i found the problem: I thought the 620s didn't use proportioning valves? Quote Link to comment
heretic Posted June 25, 2015 Report Share Posted June 25, 2015 to my knowledge all 620's have them....... the 521 does not. Quote Link to comment
flatcat19 Posted June 25, 2015 Report Share Posted June 25, 2015 Load sensing valve. Quote Link to comment
shadow1752 Posted June 25, 2015 Author Report Share Posted June 25, 2015 Is there a reason that would be disabled on the motorhome body? Quote Link to comment
heretic Posted June 25, 2015 Report Share Posted June 25, 2015 Whomever did the conversion may have eliminated it. The weight bias is far different now than what Datsun originally designed the braking system for. How does the braking feel, especially a panic stop? 2 Quote Link to comment
shadow1752 Posted June 25, 2015 Author Report Share Posted June 25, 2015 Feels great for the weight on her, Used to try and yank the wheel out of my hand to the right during a panic stop but after playing with the front calipers that problem went away, spongy breaks but I do have a leak that I finally found in the rear, new wheel cylinder and a complete bleed and she should be right as rain i assume 1 Quote Link to comment
shadow1752 Posted June 25, 2015 Author Report Share Posted June 25, 2015 So seeing as parts are pretty hard to find (though im not sure the condition of it or how I would even think of testing) it anyone interested in this part? Quote Link to comment
heretic Posted June 25, 2015 Report Share Posted June 25, 2015 Thats great news then. Yeah the NLSV would have zero effect on pulling left or right. I wouldn't worry to much about it if the brakes feel good. If after you replace the wheel cylinder they still feel like you're not getting enough stopping power you could always put D21 Hardbody spindles & larger front calipers on your truck. It's a 100% bolt-on affair. Datsun 620 on the left........ D21/Pathfinder V6 dual piston calipers on the right. You should put an add in the classifieds if you want to sell your NLSV 3 Quote Link to comment
datzenmike Posted June 26, 2015 Report Share Posted June 26, 2015 The NLSV is mounted with the front slightly higher than the back. Inside is a steel ball that rolls forward and blocks a valve when braking and limits the amount of brake pressure sent to the rear drums. As weight is added to the bed it sinks lower and the incline becomes slightly steeper. This makes it harder for the ball to roll forward and block the valve and more pressure is sent to the rear drums. The increased rear weight also increases the traction of the tires so more braking effort can safely be applied. 2 Quote Link to comment
shadow1752 Posted June 26, 2015 Author Report Share Posted June 26, 2015 Thats great news then. Yeah the NLSV would have zero effect on pulling left or right. I wouldn't worry to much about it if the brakes feel good. If after you replace the wheel cylinder they still feel like you're not getting enough stopping power you could always put D21 Hardbody spindles & larger front calipers on your truck. It's a 100% bolt-on affair. Datsun 620 on the left........ D21/Pathfinder V6 dual piston calipers on the right. You should put an add in the classifieds if you want to sell your NLSV Those just bolt right on? love the idea of more surface area Quote Link to comment
heretic Posted June 26, 2015 Report Share Posted June 26, 2015 Those just bolt right on? love the idea of more surface area The calipers themselves DO NOT but the conversion is all OEM Nissan Parts that bolt on. 1 Quote Link to comment
shadow1752 Posted June 26, 2015 Author Report Share Posted June 26, 2015 Is there a write up somewhere of what I need to do to convert? I tried doing a forum search but its funky on my phone Quote Link to comment
heretic Posted June 26, 2015 Report Share Posted June 26, 2015 The bigger brakes also use vented rotors. 620 solid rotor D21 vented rotor 2 Quote Link to comment
heretic Posted June 26, 2015 Report Share Posted June 26, 2015 I don't know of an actual write up on the forum. The swap is generally associated with drop spindles or an early 620 drum to disc conversion. You could search those types of topics. I've done the swap on two of my 620's very simple & straight forward. There is contradicting information on whether or not the stock 620 wheels can still be used. Both of my trucks are running aftermarket wheels. One set is 18's & the other is 15's. I've got no clearance issues. The parts needed to do the swap/conversion: Spindles: 1987-97 V6 D21 2wd Hubs: 1987-97 V6 D21 2wd Calipers: 1987-97 V6 D21 or Pathdinder Rotors: 1987-97 V6 D21 2wd Brake Hose- I used V6 D21 4wd ones. I don't know why but they fit & work perfectly. Ball Joints- OEM 620 top & bottom. I used dropped spindles so the only part I sourced from the junkyard was the hubs & hardware. I purchased all the bearings, seals, calipers & rotors from RockAuto. If it's something you're interested in & you have any specific questions you can always PM me & I'll help the best I can. 4 Quote Link to comment
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