The Effects Of Brake Torquing?

[Corey]

Hello,

Trying to figure out the real effects of brake torquing…both on standard and auto trans (I know more about auto trans than I do standards, so I’ll be using an auto trans as a reference).

My auto trans teacher said brake torquing can rip through clutch packs because the clutches will spin on one another rather than staying compressed. It never really made sense, because all of the trannies we did in class, the clatch packs were splined to the outermost-part of the annulus/sun gear.
If it’s splined…how can it spin?

Topic

[Bill]

I am not a transmission tech by any means but years of experience have shown me that in a few situations i have seen transmissions completely ruined by brake torquing. I have seen converters ballooned from it so bad that
the converter clutch would not lock up after. Because you’re pressurising the fluid heavily you cause the fluid to heat up to a very high temp. This causes the fluid to boil and foam releasing the required pressure on the clutch plates.

I have even seen input shaft splines stripped from over brake torquing. Todays transmissiions are weak crap so keep that in mind
while brake torquing.

[Corey]

How is it any different than flooring it from a stand-still? Or flooring it for 5 seconds at a time, though?

Another thing I never understood…
The impeller (or turbine — I always mix the two up) rotates WITH the engine. The turbine (might be the impeller, I forget), is what transfers to the power to, eventually, the wheels.
If the impeller is spinning faster (higher RPMs due to brake torquing) and is causing the turbine to spin, but nothing else is spinning (brake torquing, but not doing a burn out — wheels are not spinning), what’s happening inside the transmission? Does the turbine freewheel and then lock up once the brakes are let off?

[Bill]

Eric has an excellent vid about converters on youtube. You should look it up as it might help you understand a little more.

[Author]

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