1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by mike77cos »

Well I just spent the best part of the day reading through this thread on and off, and wow, awesome work and great comedy.
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

Uppertown wrote: Sun Nov 20, 2022 9:26 pm When you say "fully depressed" is that with the pedal on the floor when bleeding or when it's bleed and you push as hard as you can?
we did the bleeding with no electricity going to the iBooster and the pedal operated normally as far as the bleeding goes, then we wired it up and supplied power to the iBooster and the assist comes on and the pedal works for about 80% of the stroke and then as it bottoms out it starts to wobble and pulsate and makes a noise
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

thinking about ditching the Gen 1 iBooster in favor of the Gen 2 ?

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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Ev8 »

Gregski wrote: Sun Nov 20, 2022 2:25 am well a bit of bad news, after replacing the 2018 Honda CR-V bad brake booster with a good one, and rebleeding the brakes the pedal still pulsates when fully depressed, so if any of youz have any ideas or suggestions on what to try I am all ears

Is it possible the crv master cylinder is simply to small for your brake system so therefore doesn’t push enough fluid per stoke, so you are maxing out the stroke of the i booster, is there a different larger diameter master cylinder that will bolt up?
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Uppertown »

Gregski wrote: Mon Nov 21, 2022 4:35 am we did the bleeding with no electricity going to the iBooster and the pedal operated normally as far as the bleeding goes, then we wired it up and supplied power to the iBooster and the assist comes on and the pedal works for about 80% of the stroke and then as it bottoms out it starts to wobble and pulsate and makes a noise
OK that doesn't sound normal, have you tried bleeding with the power on? (Is it even possible???) might be worth hitting the CRV forums and asking there (don't tell them where the cylinder is or their heads will explode) EV8's suggestion is a possibility too - it sounds like the sort of behavior I'd expect from a system that was "pumping the pedal" due to an over long travel - hence my original question.
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by robertwa »

To test the hypothesis that the master is too small, how about temporarily closing off the line to one of the rear drums as a test? This would halve the fluid displacement to the rear
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

Uppertown wrote: Mon Nov 21, 2022 9:33 am OK that doesn't sound normal, have you tried bleeding with the power on? (Is it even possible???) might be worth hitting the CRV forums and asking there (don't tell them where the cylinder is or their heads will explode) EV8's suggestion is a possibility too - it sounds like the sort of behavior I'd expect from a system that was "pumping the pedal" due to an over long travel - hence my original question.
first thank you all for trying to help and offering advice and suggestion always welcome another point of view and any ideas you may have

so we did two types of bleeding
  • 1A. we first bleed the air out of the master cylinder (while it was mounted on the truck) using the one guy cracks the outlet hose lines while another guy pushes on the brake pedal manual method, ie no power to the iBooster
  • 1B. we also tried to bleed the master cylinder while supplying power to the iBooster again by just simply cracking the outlet port line nuts
  • 2. we bleed the brake slave cylinders with no power supplied to the iBooster
I am thinking of reverse bleeding the system using one of these $85 dollar doo dads on AMAZON



71Dcq06FtmL._AC_SL1000_.jpg
511F5hb+uwL._AC_SL1000_.jpg
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

robertwa wrote: Mon Nov 21, 2022 3:41 pm To test the hypothesis that the master is too small, how about temporarily closing off the line to one of the rear drums as a test? This would halve the fluid displacement to the rear
yes sir I did just that, and mention it in the video, even went as far as capping them both, here are some pics

IMG_0695.JPG

IMG_0697.JPG
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

mike77cos wrote: Sun Nov 20, 2022 10:10 pm Well I just spent the best part of the day reading through this thread on and off, and wow, awesome work and great comedy.
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Uppertown »

"I am thinking of reverse bleeding the system using one of these $85 dollar doo dads on AMAZON"

I think these work better;

https://www.amazon.co.uk/Mityvac-MV8000 ... 07130&th=1

Not least because they don't force air to dissolve into your brake fluid.
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

Uppertown wrote: Mon Nov 21, 2022 4:36 pm "I am thinking of reverse bleeding the system using one of these $85 dollar doo dads on AMAZON"

I think these work better;

https://www.amazon.co.uk/Mityvac-MV8000 ... 07130&th=1

Not least because they don't force air to dissolve into your brake fluid.
I do have that very vacuum pump, and my concern with it is that, the Master Cylinder sits way high in this truck possibly 2 feet above the slave cylinders, and if I suspect the air is trapped inside the MC then we would have to work against physics and gravity with a vacuum pump and try to pull the air bubbles down and out the slave cylinders, that's why I want to try pushing it out the top

IMG_0741.JPG
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

so after eyeballing the old Honda CRV master cylinder some more I learned it actually houses not one but two pistons in series formation one behind the other


here is the front piston, it appears to be hollow

IMG_0733.JPG
IMG_0735.JPG

and here's the second one lurking behind it

IMG_0737.JPG

and here are both pistons in serial formation
IMG_0739.JPG
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Uppertown »

Gregski wrote: Tue Nov 22, 2022 4:21 am I do have that very vacuum pump, and my concern with it is that, the Master Cylinder sits way high in this truck possibly 2 feet above the slave cylinders, and if I suspect the air is trapped inside the MC then we would have to work against physics and gravity with a vacuum pump and try to pull the air bubbles down and out the slave cylinders, that's why I want to try pushing it out the top
Fair enough that makes sense. If you can find an O-ring that just fits over your bleed pipe in its free state, then push it back over the nipple once the pipe is in place it will help to seal, a tie wrap can work too but they tend to distort the shape of the pipe.

The two pistons are part of the dual circuit failsafe system, they might be part of the problem as air can get trapped between the two pistons.

Is your master cylinder defiantly returning all the way back? Check there is a little free play at the push rod when the pedal is returned to make sure the transfer ports are being fully uncovered.
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

a little comedy and a lotta brake fluid


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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

this does not resemble brake bleeding weather


IMG_E0746.JPG

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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

part three of the long awaited trilogy: Brakes ACCORDing to Greg


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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Uppertown »

Gregski wrote: Wed Nov 23, 2022 6:05 pm part three of the long awaited trilogy: Brakes ACCORDing to Greg
[/quote

I don't think it's the bleeding that's made the difference it's the spacers you added that are allowing the pistons to return far enough to uncover the transfer (intake) ports. Keep at it I'm sure you're getting there.
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

Uppertown wrote: Thu Nov 24, 2022 12:59 pmI don't think it's the bleeding that's made the difference it's the spacers you added that are allowing the pistons to return far enough to uncover the transfer (intake) ports. Keep at it I'm sure you're getting there.
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

and this is what a $150 bones worth of hose reducers, couplers, and thing majigs look like

Sourced from: Pegasus Auto Racing
IMG_0870.JPG

some trial fitment going on here, I do plan on cutting the 90° elbow shorter to bring the hose closer to the Inverter allowing me to use a hose clamp off of it to secure it so it's not all up in space like this (by the way that's a Tesla water pompulator)
IMG_0872.JPG

same on this radiator inlet hose, this is coming from the passenger side of the transmission and I hate that it has to run across the engine bay under the battery pack, wish my inlets and outlets on the radiator were on opposite sides (how could Genereal Motors not envision this back in 1967?)


this 90° downward elbow will also be shortened and brong over closer to nearly hug the radiator, this again is just some expensive brain storming
IMG_0874.JPG
this hose will eventually not come out of the battery pack but run in front of it closer to the radiator
IMG_0876.JPG

yup, so I tried to cheap out on one adapter and it bit me, here I was trying to connect a 5/8 water pump hose to a 7/8-1 1/2" radiator reducer and no dice, so what you have to do is go 5/8 - 1" reducer to a 1"-1 1/2" reducer to the radiator, oh well this gives me a chance to order a 45° reducer instead of the straight one so there's that
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by johu »

great attention to detail over in good enuff county
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Re: 1971 GMCe Lexus GS450H BMW 530e Tesla Model S powered Electruck

Post by Gregski »

johu wrote: Thu Nov 24, 2022 7:12 pm great attention to detail over in good enuff county
ha ha, thank you

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