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So I looked through CarMax and CarGuru and some other sites for 2013 to 2015 GS350s. Not a single one had a Brake Hold option. It seems 2013+ GS450h and 2016+ GS350 have Brake Hold, the earlier years do not. This turned into a major retrofit project, might not even be worth the headache. If someone has a GS350 that has the brake hold feature, please message me!
Interesting yet strange. I'm wondering if GS 350 sold in some other countries may have been equipped (or possibly optioned) with the Brake Hold feature...
Just checked TIS. 2015 does not have the BRAKE HOLD in the repair manual. 2016 does. I will see what the system entails and see if I can duplicate it in the 2015. Interestingly enough, the GSF (URL10) does not have the brake hold either.
I can't find any associated parts for the Brake Hold feature to see how it actually works with all the safety lockouts, etc. I was hoping to find a layout or parts list. I tried looking at different car brands - M-B, Infiniti, Jaguar, Land Rover, etc. Nothing...
I can't find any associated parts for the Brake Hold feature to see how it actually works with all the safety lockouts, etc. I tried looking at different car brands - M-B, Infiniti, Jaguar, Land Rover, etc.
Only difference I can see in the wiring between a 2015 and 2016 is that the button is wired to the brake actuator. Just sends a signal to hold. So again, if the extension harness already had the connector for the brake hold... it should in theory work... but it's not. Will keep researching.
I wonder if there is a difference between the brake actuator assembly for the vehicles that have Brake Hold versus the vehicles that do not have the Brake Hold feature?
I wonder if there is a difference between the brake actuator assembly for the vehicles that have Brake Hold versus the vehicles that do not have the Brake Hold feature?
I'm also curious if there's any difference between how the MY13-15 450h brake hold works verses the MY16-18 350 and if the parts are interchangeable.
I wonder if there is a difference between the brake actuator assembly for the vehicles that have Brake Hold versus the vehicles that do not have the Brake Hold feature?
Both have part numbers starting with 44050-30XXX, unfortunately it does not really describe anything in detail. I feel like I am overlooking something simple.
Do MY13-15 GS have auto hill hold where it holds the brakes for a second or two to give you time to move from brake to gas without rolling backward? (Without having to press the brake all the way down to the floor first)
Does the GS450h in this thread that has brake hold also have DRCC? I'm wondering if it's the brake actuator (not sure if this is the right term) that's different? Thinking simply, don't non-DRCC cars not have the necessary parts for the vehicle to control braking on its own whereas DRCC equipped cars would have to be able to control braking function completely without physical pedal input? I wonder if there's a connection...
Maybe the rear brakes in the 2016+ 350's is brake by wire(electronically controlled) like in the 450h.
For MY13-15 owners, do you notice a difference in brake pedal feel when you switch between different drive modes?
In my '18, the pedal feel and response changes. For example, in Eco mode the pedal is soft, spongey and requires more travel whereas in Sport+ it's very firm and requires little input for strong braking. On the G-Force display in the instrument cluster, you also get a chart that shows brake and accelerator pedal position. Gas pedal is obviously electronic, but the brake pedal is also being electronically measured in the same way.
If this info can be of any use in helping you figure out what will get this working, the brake hold function has a bit of logic built-in and isn't just 100% on or 100% off. I'm pretty sure whatever pressure you put on the brake pedal when it activates is how much pressure the system holds the brakes with. It also pays attention to whether or not the vehicle is on a hill. When facing downwards on a steep hill and you press the gas to release the brakes and begin accelerating, it releases brake pressure slowly rather than all at once so you takeoff smoothly and gently rather than suddenly jerking forward.
Do MY13-15 GS have auto hill hold where it holds the brakes for a second or two to give you time to move from brake to gas without rolling backward? (Without having to press the brake all the way down to the floor first)
Does the GS450h in this thread that has brake hold also have DRCC? I'm wondering if it's the brake actuator (not sure if this is the right term) that's different? Thinking simply, don't non-DRCC cars not have the necessary parts for the vehicle to control braking on its own whereas DRCC equipped cars would have to be able to control braking function completely without physical pedal input? I wonder if there's a connection...
My 2013 GS 450h does not have DRCC. I think all the 450h's have the brake hold feature standard, it's not a separate option.
I was going to eventually check techstream but if you are doing it, let us know!
Can't find anything in TS...what's interesting is that the software contains ECUs which don't exist in my car...I would have expected to find something about brake hold if it had been available. There was nothing for adjusting the hill hold time either. I'm keen to discover what actually controls the timing.
My 2013 GS 450h does not have DRCC. I think all the 450h's have the brake hold feature standard, it's not a separate option.
44050-30760 - This is the brake actuator assembly/modulator valve in my car that has no brake hold.
44050-30A50 - This is for my car but with "pre-collision".
44050-30540 / 44050-30760 - This is for a 2013 GS450h that comes standard with the brake hold without pre-collision. This is the same as my part number... so I am assuming the pin is there for the brake hold.
I'm very reluctant to play around with the brake lines going to the actuator unless I'm 100% sure the swap will allow me to add the brake hold control signal. Even going from one production range to another or one year to another, the pin outs change dramatically. Wish I had more detailed wiring diagrams for the different 44050 part numbers.
[QUOTE=eddie420;10372368]44050-30760 - This is the brake actuator assembly/modulator valve in my car that has no brake hold.
44050-30A50 - This is for my car but with "pre-collision".
44050-30540 / 44050-30760 - This is for a 2013 GS450h that comes standard with the brake hold without pre-collision. This is the same as my part number... so I am assuming the pin is there for the brake hold.
44050-30760 - This is the brake actuator assembly/modulator valve in my car that has no brake hold.
44050-30A50 - This is for my car but with "pre-collision".
44050-30540 / 44050-30760 - This is for a 2013 GS450h that comes standard with the brake hold without pre-collision. This is the same as my part number... so I am assuming the pin is there for the brake hold.
10-06-18, 07:37 PM
If someone has a GS350 that has the brake hold feature, please message me!
