280zx BMC on a 510

Suspension, including wheel, tire and brake.
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mpdcop
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280zx BMC on a 510

Post by mpdcop » 13 Aug 2011 07:01

Ok, So I have read all over this site...Cannot find anyone that explains if the 280zx BMC will fit to a 510. I have put the 280zx front and rear brakes on the car and would like to finish it off with the same model BMC. Any help would be great.. Thanks.

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PoorMtnKid
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Re: 280zx BMC on a 510

Post by PoorMtnKid » 13 Aug 2011 07:15

Yes it will fit. However you need to find one off an early model 280zx. The bolt pattern on the 510 is at 12 & 6 and the first few years of the 280 were the same way. Then The later years it switched to 3 & 9. So just make sure to get it to match the same bolt pattern. When I was looking for mine I could not find a single dealer that sold them at a reasonable price or who had them at all. I went to a junk yard to grab one and it worked out fine. If you have any questions on this swap let me know I did it just a few months back.
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datzenmike
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Re: 280zx BMC on a 510

Post by datzenmike » 13 Aug 2011 09:09

You want the 15/16" '79-'81 master.
"Nissan 'shit the bed' when they made these, plain and simple." McShagger510 on flattop SUs

mpdcop
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Re: 280zx BMC on a 510

Post by mpdcop » 14 Aug 2011 09:28

Thanks for the info!!

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Re: 280zx BMC on a 510

Post by mpdcop » 24 Aug 2011 20:11

Ok, So I am able to get a new 79 280zx BMC at my local Kragen for 140$. I asked about a proportioning valve, the guy said they cannot get it. So a few questions. Do I need one off of a 79 280zx? Can I buy one, say...off of summit, and use it? I really don't know much about brakes, shit cars for that matter. lol thanks

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PoorMtnKid
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Re: 280zx BMC on a 510

Post by PoorMtnKid » 24 Aug 2011 20:17

I did not know what it was so I googled it. I dont think I used one and my breaks work great. Someone else may want to chime in here though
Last edited by PoorMtnKid on 25 Aug 2011 10:55, edited 1 time in total.
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mpdcop
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Re: 280zx BMC on a 510

Post by mpdcop » 24 Aug 2011 20:21

Well that would be my next question...lol Do I even need one, does the BMC have it included or built in? The kid at Kragen's was unable to tell me.

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PoorMtnKid
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Re: 280zx BMC on a 510

Post by PoorMtnKid » 25 Aug 2011 10:56

From what I was understanding from Google is that all it does is ajust the amount of pressure to the back breaks since less force is needed. I would say no you dont need one.
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bertvorgon
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Re: 280zx BMC on a 510

Post by bertvorgon » 25 Aug 2011 12:31

It depends...IF...you get premature real wheel lock up...THEN you may want to add a brake bias adjuster, as this then will let you DECREASE the pressure to the rear brake.

In regular driving, lock up may not show up, but, if you get HARD on the brakes, and have big weight transfer to the front, the rears may lock up, when the rear of the car un-weights..
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datzenmike
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Re: 280zx BMC on a 510

Post by datzenmike » 25 Aug 2011 16:24

Yup. Some cars are 'adjusted' for front/rear bias at the factory by differing the size of the rear brake wheel cylinders. If there was too much brake at the back a larger cylinder can be used.

I don't think the 510 had a proportioning valve. As Bert suggested, if you have rear lock up before fronts, easy enough to test... just find a safe place with level dry pavement and brake progressively until there is visible signs on the road surface. (be sure the brakes are working properly and are adjusted) If there are only rear rubber marks or rears leaving longer strips, then a manual proportioning valve can be plumbed in line with the back brakes and the pressure to them turned down to compensate. Ideally you would want front and rears to lock at about the same time.

I did as he suggested years ago on my truck. It has a severe body and suspension lift and when braking, even moderately, the weight (a 3,600 lb 620 on 33s) would tip forward off the rear and they would lock with embarrassing results at sudden red stop lights. In addition braking on any corner would cause the rear to loose traction and swing around. I got a cheap Wilwood adjuster and cut about 60% off the rears. This gives a mild squeal from all four tires and equal lock up when tested. I haven't needed it on the street but good to know I can hammer the brakes with confidence and control.
"Nissan 'shit the bed' when they made these, plain and simple." McShagger510 on flattop SUs

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