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Need StopTech/TRD BBK ST-40 Caliper Info...

SooRunner

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Just wondering how many different ST40 calipers does StopTech make? Is there a difference in caliper piston size?

I just picked up a 4Runner and removed my TRD BBK from my X-Runner and trying to slap it on my 4Runner.

I'm assuming all I need is new rotors 6 lug, the mounting bracket for 4runner, and brake lines?

Will it work?

TIA!

(others on another forums said stop tech makes 32 different ST40's so it will not fit the 4Runner...true or not?):hmmmm2:

I tried searching stoptech website and it does not have any information on piston sizes...
 
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autobodyX

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Yes you need the caliper bracket for the 4 runner or the 4wd tacoma. If you want to sell the rotors from the X I my be interested. Piston size is differs between different applications I know the tundra kit Pistons has a larger leading piston and a smaller rear. You will be fine using the ones you have.
 

Gadget

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The ST-40 calipers are all the same except piston size.

After StopTech got bought out and TRD pushed URD out of the StopTech market, some things started to change. Some of the TRD calipers are different than the ST-40 calipers and they tried to do away with the adapter bracket and made some of the calipers have the bolt on lugs as part of the caliper. What you have may or may not bolt up so be careful.

G
 

Torspd

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Better than Rotora. They wanted 500 for the pair.
 

Blue10XR

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autobodyX, would you recommend the rear conversion? I am thinking about ordering it.
Pros Cons? Looking for some input.

TIA...
 

autobodyX

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The rear conversion looks better than drums but the rotors are small inside the 18 inch wheel. Drum brakes work as good as the discs but do not shed the heat from frequent use. The E brake is not as strong with the conversion but works good enough. I had to modify - tweek mine to get it to quit squealing, the pads hung past the edge of the rotor causing a noise after they wore in. The brake bias and peddle feel is very good.
 

autobodyX

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Better than Rotora. They wanted 500 for the pair.
Yea if I change from the 355 mm single piece rotor to the 332 two piece rotor I will need the brackets too. I
Have a 4 runner scheduled in for some repairs.

:hmmmm2: might do some figuring.
 

SooRunner

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I guess I'm going to have to find out what the oem caliper piston size are and what piston size my TRD BBK are...
 

SooRunner

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Yea if I change from the 355 mm single piece rotor to the 332 two piece rotor I will need the brackets too. I
Have a 4 runner scheduled in for some repairs.

:hmmmm2: might do some figuring.

I have the 332 2 piece rotor I'm going to sell...its 5 lug for the xrunner.
 

Torspd

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Yea if I change from the 355 mm single piece rotor to the 332 two piece rotor I will need the brackets too. I
Have a 4 runner scheduled in for some repairs.

:hmmmm2: might do some figuring.

Why are you changing diameters?
 

Blue10XR

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The rear conversion looks better than drums but the rotors are small inside the 18 inch wheel. Drum brakes work as good as the discs but do not shed the heat from frequent use. The E brake is not as strong with the conversion but works good enough. I had to modify - tweek mine to get it to quit squealing, the pads hung past the edge of the rotor causing a noise after they wore in. The brake bias and peddle feel is very good.

I appreciate the feedback....
 

Torspd

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My isF rotors are very heavy and only come drilled. I get two events of hard use and they start cracking.

Gotcha. That sucks. I see your need to move to a better solution.

Different setup, I know, but my Stop Tech rotors are 355x32 and drilled only. Three ( 2.5 actually, over two years) events and daily driving, and they are still healthy. Different tracks yes, and differing amounts of daily driving, but they have proven very worthy.
 

autobodyX

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I't called HPDE or PDX we do not wheel to wheel race but it is close and fairly safe way to enjoy all the modifications without braking any laws. I daily drive my track set up but it squeaks and squeals loudly. I run a very aggressive pad they make tons of brake dust and burn up rotors. Having said that if you choose a street brake pad you will have no issues like mine.
 
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