FAQ - Replacing mastercylinder Lj80II with Sj413

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vidar
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FAQ - Replacing mastercylinder Lj80II with Sj413

Post by vidar »

I decided i needed some more braking power with the disk brakes up front on my lj80 1983, i used SMUZ´s very nice write up, but i had to make some adjustments for my lj80II. PS: im not trying to copy Smuz´s :)

Take care when doing this, this is not done by proffesional mechanics and should be done at yor own risk :suz:

Bought the front end of a sj413 brakeassy from a local scrappy. Remove the old one:

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Remove the cotter pin on the brakepedal assy:

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Removed, use care not to spill any brake fluid, it will make your lj rust..... :) yeah you know all about that

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Sj413 and lj80, the holes from the lj80 cylinder will be measured and drilled with the same width on the 413 cylinder.

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I removed the pin connecting the lj80 cylinder to the brakepedal, it was fastened with a retainer which i easyli pried out with a small screwdriver.

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Then i drilled the 413 cylinder so it would fit the same holes as the lj80 cylinder. Take care doing this so you dont make one large hole.

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Then i made the firewall hole bigger so it would accomodate the 413 cylinder, remember to put the two screws holding the pedal assy in its place when drilling out the hole.

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Removed a lot of old deposits from the 413 cylinder

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Test fitting, both "ears" on the 413 cylinder was hitting some of the body, i just bent it back a bit.

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The pin for the brake assy was made ismaller, so it would fit inside the 413 cylinder.

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Final assembly, i made some shims covering the original holes for the 413 cylinder, the top of the fluid holder is a tight squeeze into the firewall, but its not a big issue.

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Re: FAQ - Replacing mastercylinder Lj80II with Sj413

Post by Frankenstein »

That's looking good! I think you can also grind down the ears to make it fit instead of bending the body.

So how is the breakingpower?
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Re: FAQ - Replacing mastercylinder Lj80II with Sj413

Post by Jimny »

Very nice write-up!! :cool: Good job!









BTW: I like your vice! I need one like that, I keep saying I'm going to get one but haven't yet.
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Re: FAQ - Replacing mastercylinder Lj80II with Sj413

Post by ResidentPsycho »

:cool: nice write up vidar.

hope it is as easy as it looks when i get around to it :))):
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Re: FAQ - Replacing mastercylinder Lj80II with Sj413

Post by vidar »

Thanks :)
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Re: FAQ - Replacing mastercylinder Lj80II with Sj413

Post by Smuz »

Nice write-up.

Don't worry about copying me, this is all about info sharing. The more info the better.
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Re: FAQ - Replacing mastercylinder Lj80II with Sj413

Post by vidar »

can we put it on the frontpage in the how to section? i´ve had some requests about the conversion?
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Re: FAQ - Replacing mastercylinder Lj80II with Sj413

Post by vidar »

Tried the brakes today......... :ohno:

Stopping power :cool: :suz:
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Re: FAQ - Replacing mastercylinder Lj80II with Sj413

Post by Frankenstein »

Awesome :D
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Re: FAQ - Replacing mastercylinder Lj80II with Sj413

Post by vidar »

And then i tried them in the wet.... ooops, had to brake while turning, nearly spun around:)

So now i need a brake bias valve :) anyone?
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Re: FAQ - Replacing mastercylinder Lj80II with Sj413

Post by Frankenstein »

Spidertrax has proportioningvalves. They use them a lot on samurai's when they put on rear diskbrakes.
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Re: FAQ - Replacing mastercylinder Lj80II with Sj413

Post by mrrocky »

Just did this swap but used a master cyl from a 2001 suzuki baleno sedan, same as a sj50/70 just newer and has a smaller cap making filling easier given firewall proximity
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