Possible reason for Semi being towed

[MobileClimate]

Condition Certain Semi trucks are equipped with a parking brake valve module that may intermittently not allow the operator to engage or disengage the parking brakes. NOTE: The performance of the air brake system is not affected. Operators should monitor the side console parking brake switches and confirm the LEDs match the intended parking state per the Tesla Semi Operator’s Manual. • If the valve does not allow the operator to disengage the parking brakes, the LEDs will remain on, indicating that the parking brakes have not disengaged. • If the valve does not allow the operator to engage the parking brakes, the LEDs will remain off, indicating that the parking brakes have not engaged

 

[mongo]

Condition Certain Semi trucks are equipped with a parking brake valve module that may intermittently not allow the operator to engage or disengage the parking brakes. NOTE: The performance of the air brake system is not affected. Operators should monitor the side console parking brake switches and confirm the LEDs match the intended parking state per the Tesla Semi Operator’s Manual. • If the valve does not allow the operator to disengage the parking brakes, the LEDs will remain on, indicating that the parking brakes have not disengaged. • If the valve does not allow the operator to engage the parking brakes, the LEDs will remain off, indicating that the parking brakes have not engaged

As of March 24, 2023, Tesla has not identified any warranty claims, crashes, injuries or deaths that may be related to such condition.
Bendix calls out a 2% failure rate.

Drivers can also fan down the brakes to set the parking brake, if the valve fails. Per Bendix, repeated toggling can also sometimes set the brakes.

 

[MobileClimate]

This may explain the pics of the service van and the semi getting towed around that corner about 6 months ago I believe..meaning it’s no big deal for all the idiots that were taunting semi failure

 

[mongo]

This may explain the pics of the service van and the semi getting towed around that corner about 6 months ago I believe

I suppose it's possible, but Tesla didn't mention any failures in their recall report.

Bendix:
7/28/22 Customer N observation of vehicle intermittently not parking after vehicle dyno testing and other environmental testing. Discussed in joint engineering meetings. Environmental, testing, component and application factors are evaluated.
11/3/22 Customer L reported a vehicle intermittently not parking ( approx. 1 - 40 attempts). Data logging
traces confirmed observation. PVM and other parts removed from vehicle but engineering not able to recreate in lab environmental tests. Continue to investigate possible application, component or system interactions.
11/30/22 Customer N on-vehicle observation of intermittent non-parking. PVM received and engineering is able to reproduce the issue with this component.
12/13/22-1/25/23 2 additional customer observations. Engineering able to reproduce intermittent malfunction but not able to define manufacturing defect or design issue.

Tesla:
- On February 13, 2023, Bendix first communicated to Tesla their Safety Committee’s determination to file a
recall for the involved component based on field issues Bendix observed from their customers.
- On February 14, 2023, Tesla met with Bendix to review the issue in more detail and discuss Bendix’s recall determination. Shortly thereafter, Bendix filed a 573 Safety Recall with NHTSA for the component in question.
- From February 14 to March 17, 2023, Tesla investigated the root cause and completed a risk assessment of the impact that the condition introduced in affected Tesla Semi trucks.
- On March 17, 2023, Tesla completed its investigation, and determined to file a voluntary recall.

 

[MobileClimate]

Tesla may end up doing there own modules like they did with the falcon doors when they find out how far behind bendix is on tech compared too bosch

 

[mongo]

Tesla may end up doing there own modules like they did with the falcon doors when they find out how far behind bendix is on tech compared too bosch

This is not a high tech device (not ABS/ traction control). Intellipark is basically just a solenoid pilot driven valve for air brakes with some additional smarts to reduce rollaways.

 

[MobileClimate]

Air leaks on the trailer or tractor could be a serious battery drain since the air compressor is not driven by the front gear set like it’s on a diesel engine. I’m curious to know who makes the air compressor for tesla and if they thought about what air leaks on a trailer would do to the range

 

[mongo]

Air leaks on the trailer or tractor could be a serious battery drain since the air compressor is not driven by the front gear set like it’s on a diesel engine. I’m curious to know who makes the air compressor for tesla and if they thought about what air leaks on a trailer would do to the range

As regards the valve, it was an internal leakage path that prevented valve actuation when commanded, not a continuous leak to ambient.
A severe leak in the air system seems like it would be a stop driving and call a tow situation.
The vehicle control computer can detect a leak based on compressor on time vs load (braking events, suspension filling).