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So, Toyota had presumably been dealing with unintended acceleration. I'm dealing with unintended braking. At around 40 mph, the van's brakes feel like they apply themselves. I've even had my wife a couple of times why I hit them too hard. This especially takes place while coasting or lightly applying the brakes to slow down. Once I hit 40 mph, the braking becomes hard. Then, it goes away. Any thoughts?
 

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There is a feature of the transmission called "Grade Logic" that normally downshifts the transmission to aid in braking.

If the downshifts are becoming more of an excessive shock, then the transmission is showing signs of wear.

Excessive shock, or flares on 3-4 upshift or 4-3 downshift:
Shift solenoid valve C defective
A/T clutch pressure control solenoid valves A and B defective
4th clutch transmission fluid pressure switch defective

Excessive shock, or flares on 2-3 upshift or 3-2 downshift:
Shift solenoid valve C defective
A/T clutch pressure control solenoid valves A and B defective
3rd clutch transmission fluid pressure switch defective

When was the last time the ATF was serviced? A drain and fill of Honda Z-1 ATF is recommended every 30,000 miles at least to keep the shifts smooth. Some even drain and fill every 3rd oil change, like me.
 
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