Guest 73LT1Z Posted January 2, 2006 Share Posted January 2, 2006 While engineering the LT1 wiring on my conversion, I elected to mount the PCM on the driver side. This put it real close to the top of the OEM master cylinder reservoirs, and since I am using the Toyota 4 piston brakes, the JTR book (and sage advice here) suggests using a 15/16 master cylinder vs. the 7/8 in the car. I did some shopping & it looks like I may be able to kill two birds with one stone. I found a Wilwood 1" MC at Summit (PN WIL-260-7563, $122, which is about the same price as the suggested 280ZX unit rebuilt) that uses remote reservoirs. I checked the specs on the bolt centers (very close- file to fit) and mount diameter, and they look very similar in design. The Wilwood has 3/16 fittings and the Datsun has 10mm. The Wilwood uses a 5/16x24 pushrod, and the Datsun has a similar diameter metric rod on the brake pedal- not sure if the Wilwood will work w/ the stock Datsun rod. A side benefit would appear to be the ease of pressure bleeding with the hoses installed . I searched here and saw no information for putting these on a Z, but I'm willing to give it a try, and will update here as I make progress. Pic of the kit from Summit's website: Specs pic from Wilwood: Quote Link to comment Share on other sites More sharing options...
Cruez Posted January 3, 2006 Share Posted January 3, 2006 Interesting... I am going to need a new M/C soon. My 4 pot calipers are in the mail. I'll keep an eye on this and see your outcome. I wonder how much difference the bolt up to the booster is going to be? Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted January 3, 2006 Share Posted January 3, 2006 Sure they're not 3/8"? Quote Link to comment Share on other sites More sharing options...
Guest 73LT1Z Posted January 3, 2006 Share Posted January 3, 2006 I'm learning all the time, 3/16 tube apparently is the same as 3/8-24 inverted flare, which is the same thread as -3 AN. Trying to find 10mmx1.0 adapters to 3/16 tube was difficult, but there are plenty of 10mmx1.0 to -3AN, so we'll see if this works. Quote Link to comment Share on other sites More sharing options...
Guest 73LT1Z Posted January 7, 2006 Share Posted January 7, 2006 Major league confusion on brake thread sizes. I bought a couple of M10x1.0 to 3/16 flare adapters and some 3/16 SAE flare brake lines, since the Wilwood stuff is all SAE. Both sides of the adapter seem to have the same thread! The really odd thing is the metric line I replaced on the RF (that threaded right into the Datsun proportioning valve) threaded right into the Wilwood proportioning valve. The older lines did not, so I rethreaded them to 3/8-24. I got the prop. valve, MC, and clutch MC installed tonight & all the brake lines connected. I'll do some pics a little later. The clutch pin on the pedal is big time aggravatng. I was able to swap out the rod in the Wilwood clutch MC with the Datsun one, so I didn't have to rethread or shorten anything. The brake MCs are very similar in size, but I had to spend about 5 minutes filing the mounting holes on the new one to fit the Datsun booster. I ended up with a regular reservoir up front and a remote one on the back of the MC. Quote Link to comment Share on other sites More sharing options...
fastzcars Posted January 7, 2006 Share Posted January 7, 2006 I was thinking of using that same master, but you beat me to it. Can't wait for some pics. BTW. I did use a single res, master fir the clutch from wilwood. I had to retread the dastun clevis, and file fit the mounting holes. as well as used a 3/16 to -3 adapter for my cluych hose. As far as the brake lines < i would just get some 3/16 brake lines from NAPA. Cut off one end and reflare with a metric fitting, they are the same diamemter tubing. Just a thought. Quote Link to comment Share on other sites More sharing options...
Guest 73LT1Z Posted January 7, 2006 Share Posted January 7, 2006 Here are the pics- the hose to the the reservoir is not yet connected, and the front cap is real tight under the PCM, but it comes off & on w/o any problem. The clutch rod was an easy swap for anyone else doing this- pop the retaining clip out on the Datsun unit, remove the rod (leave the retainer). On the Wilwood one, remove the snap ring, replace the rod with the Datsun one & use the Wilwood retainer & snap ring. This stuff interchanges so easy it is like it is made by the same company! Quote Link to comment Share on other sites More sharing options...
Ed260Z Posted January 7, 2006 Share Posted January 7, 2006 I can see why you needed that M/C. Let us know how the brake pedal feels, once it's all ready to go. Quote Link to comment Share on other sites More sharing options...
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