Dual diaphragm booster doesn't fit

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Jul 10, 2012 | 11:59 AM

moroza

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Dual diaphragm booster doesn't fit

Lots of bad info has been holding up my brake upgrade... First I buy some V6 calipers and throw out the pads, having read that they're the same size. They're not. There's another $15 and a few days of transit. I also buy a "hardware kit" only to find that it doesn't have the pins. There's another trip to the junkyard 20 miles away. And now this: trying to fit a booster from a '90 4Runner (same one as provided the calipers), having read that it's just a slight sheetmetal bend away from fitting... the hell it is. Huge clearance issue with the steering column U-joint (

and why are there two? or even one, when the wheel doesn't tilt?). Can someone tell me for sure what dual-diaphragm booster will clear the clutch cylinder and steering column? I've still got a few days left to exchange that part at the junkyard.

Jul 10, 2012 | 12:13 PM

waskillywabbit

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Read the Pirate FAQ. It's all there.

:wabbit2:

Jul 10, 2012 | 01:03 PM

dropzone

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From: PNW

This might help. I still have an 86-87 Turbo booster ($till dual diaphragm booster) sitting on shelf ready to go on

Quote:

Originally Posted by dropzone

The brake booster on 1st gen Trucks is pretty dang small and the brakes suck to begin with and throw bigger tires on there you are stressing a system designs for 225/75/15's. I saw this thread over on Pirate and thought that I would pass it on, relatively cheap and easy upgrade.. Thanks to drsmash for finding a great way to improve some brake systems that are getting old and tired

I will be doing this one soon...

http://pirate4x4.com/forum/showthread.php?t=689905

part # at napa: both 2 and 4 wheel 532460

the newer booster is a dual diaphram so it should improve braking dramatically.

Pictures are from original thread:

Jul 10, 2012 | 02:41 PM

moroza

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Seems like there's a single/small (1st gen stock), single/large (3rd gen base models), dual/small (Turbo, some 3rd gens, the one I want), and dual/large (4Runners, V6 3rd gens, what I have that doesn't work). There's a couple of 3rd gens worth checking out at the boneyard.

I fiddled some more and determined that the dual/large would fit if I could replace the studs with longer ones and use the original metal spacer. So I took the booster apart, but the studs are pressed and possibly welded into some pretty thin sheetmetal, which bends with any attempt I've made to remove the studs.

Supposing I can make it fit, do you think there's any improvement of the dual/large over the dual/small? I estimate my rig's typical weight to be about 4500# when I'm done, so I want the best brakes I can get without too much custom work.

Last edited by moroza; Jul 10, 2012 at 02:44 PM.

Jul 10, 2012 | 05:05 PM

slacker

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I installed the larger one on my Trekker , I used an 84-88 2wd steering shaft , (you can see it all in my build) .
HUGE differance in braking .. (I also have rear discs and braded brake lines) , with my 315/75R16 toyos , it'll stop ... almost scary it's so good

.

Jul 17, 2012 | 11:45 AM

541SR5

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From: Houston, TX

Check out page 3 of my build thread:

https://www.yotatech.com/forums/f197...43/index3.html

I completely upgraded the brake system on my '81 (minus the stock drums in the back). I used a dual booster for an '86 turbo truck and it bolted right up (just don't use the original spacer). Only thing I did was make a new gasket to go between the booster and firewall.

PM me if you have any questions