What have you done to your rig today?

[BritKLR]

To complicate things, newer Toyota autos have the hill-start Assist Control (HAC)...

Another cheat code...

 

[DaveInDenver]

Valid point, unfortunately on the newest vehicles with electric e-brakes they automatically disconnect when put in drive so you can't actually test it. You can test the service brakes but not the e-brake.

Hadn't considered this. I've heard of electric parking brakes and HAC (which to me is high altitude compensation) but have zero first hand experience so I can only leave my thoughts based on a quite out of date information.

 

[Romer]

Good discussion. At Tech Inspection I would fail Manuals if they didnt pass the test (Stall without moving). For Autos I would not, but tell them to get it adjusted mentioning both adjustment spots with the center console easier as a first try. With the Auto Transmission in Park as a brake, I don't believe it is a requirement for an off road event. I had confirmed this with more senior folks when I started doing Tech Inspections 20 years ago. I ask them to engage the e-brake, put it in drive and take their foot off the brake.


If you leave the truck running on a Manual, the e-brake needs to hold the vehicle if you get out because you will have to be in Nuetral. Not the safest option as accidents still have happened

If get out of an Automatic and don't put the tranny in park, well you can't really help stupid If in park and it doesnt hold the vehicle, then you have bigger problems

I read some posts on the internet that said the ebrake should hold on an Automatic in Drive with 1200 rpms, which I do not feel is correct. Most others said no gas applied in Drive, Reverse and Nuetral on a hill is all it has to hold when engaged

Feel free to correct me if you have a different opinion.

 

[DaveInDenver]

@Romer might only point out that with traditional auto and manual parking brakes the only thing preventing it rolling is the prawl in the transmission, which is not unknown to fail. They are after all normally expected to only need to hold a vehicle in a parking lot and not pointed nose down on the Little Sluice. I don't know but I assume Toyota overdesigned them in our trucks but I still wouldn't trust it. Here again, I have very little experience since all I keep is 75W90 on the shelf I'm acutely aware of parking brakes...

 

[Romer]

@Romer might only point out that with traditional auto and manual parking brakes the only thing preventing it rolling is the prawl in the transmission, which is not unknown to fail. They are after all normally expected to only need to hold a vehicle in a parking lot and not pointed nose down on the Little Sluice. I don't know but I assume Toyota overdesigned them in our trucks but I still wouldn't trust it. Here again, I have very little experience since all I keep is 75W90 on the shelf I'm acutely aware of parking brakes...

Agreed, I do engage the e-brake when on trails on slopes. Although I haven't ever had an issue with the Tranny holding my truck on my daughters steep driveway I am really only talking about Automatic transmissions.

 

[DaveInDenver]

Indeed Ken.

No one's mentioned it but there are times when you might NOT engage the parking brake.

I learned this the hard way when my shoes froze solid to the drums.

 

[Rzeppa]

Both my wife's 2021 RAV4 and my 2024 250 series have electric motor operated parking brakes. I wonder if they even have an adjustment? They do have a way to be operated via a switch though, otherwise they are automatically engaged when the shifter is put into park. I've never tried to operate mine via the switch, I should try that when it is in P, R or N and see how well it works.

 

[timmbuck2]

Well the clutch bleed on my 40 lasted until the last few miles in Moab driving back to HQ after the 40's Only Run! Ordered a new clutch master and slave cylinders from Georg, hope to mess with it this week.