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Brake Booster?


rcf925

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So when I hook up vacuum to booster brakes work but car runs like crap, Unhook booster everything good so I've been driving around on manual brakes since I got back on the road. I was thinking it's about $250 to rebuild booster and I'd really like some more room on brake side as booster is pretty close to everything. Has anybody converted a smaller booster to work on these cars besides the Tii booster. I'm looking at a 72 Datsun B210 booster and it's only 5-3/4" diameter which would be nice. Anybody use one? or have any other ideas

 

 

2002 Engine Bay.jpg

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Mounts might be a challenge.

There are a lot of dimensionally- possible candidates,

but the studs for attaching to the brake pivot frame and the master

cylinder are in the wrong places.

 

It's not insurmountable (heh), but might tie you to using

an intermediate mount plate between the box and the booster,

and Datsun master cylinders.  Also, you'll need to make sure your linkage

lengths are right, both to and from the booster, and that's sometimes a hard

dimension to measure.

 

Booster swaps are very common with engine swaps in other platforms,

and there's some chatter here from a while back about alternate boosters-

Alfa, etc- as alternates to the expensive and hard to find tii booster

 

As to the standard booster, it's not a commodity, as they're quite durable.

So a WTB should net you one for far less than rebuilding yours.

 

hth

 

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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Surface area.  Average intake pressure is 4 psi (let's say), 

atmospheric is 14, so that's only 10 pounds per square inch of force

available to work with.

 

In 1969, it took 900 pounds of  pressure at the master to lock the brakes,

and the driver could add 400 (or so)  at the 4:1 pedal ratio.

That meant the booster needed to add 500, or have an area around 50 square inches.

 

I just made all those numbers up, but you get the idea.

 

I had to replace the booster on my Ferd peekup- it's huge.

When I took it apart- to discover it had RUSTED out-

I found that not only was it huge in diameter, but it had a DUAL diaphragm.

If the 2002 needs 500 pounds of boost, the Ferd has about 5000...

 

Wasn't someone converting a Smart booster a few years back?  It was pretty small.

 

t

boosted

  • Like 1

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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If one needs more clearance for sidedrafts, or want to replace a failed brake booster, I offer a twin MC booster delete kit that is compatible with the 2002 bolt pattern as the kit was initially designed for the e30 chassis, and it shares the same mounting bolt pattern. It can be set-up for 6:1 and 7:1 pedal ratios.

 

14711603_982218631886929_577373092566097

 

14608915_982218785220247_165374527141296

 

75241269_2311046809004098_48518758152787

 

Latest version as fitted to an e46 brake tower

 

74906700_2310783929030386_27422163594117

 

894689_818122608296533_11734415974371174

 

74614788_2310781289030650_51350040065060

Edited by Lee
  • Like 5

Massivescript_specs.jpg

Brake harder. Go faster.

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Hi

 

Yes, Massive has a website and it is outdated by a whopping 5 years ( www.massivebrakes.com ). But you still get a good idea of what I do. For more up-to-date info, prices and parts selection, the Facebook page is more accurate.


https://www.facebook.com/Massive-Brakes-178417442267056/?ref=aymt_homepage_panel

 

Thanks

 

Lee

 

PS The twin MC booster delete kit is 4.5" wide at its widest area... As you can see from the drawing I posted, there's also a version where both MCs are positioned on top of each other for even more clearance.

 

 

Edited by Lee

Massivescript_specs.jpg

Brake harder. Go faster.

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  • 3 months later...

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