Is the procedure the same as the MP4-12C w/o front lift? I just replaced all 4 accumulators and lost a lot of fluid. I filled up quite a bit at the revisor but needs to be bled. There's 1 bleeder screw on each side by the shock (4 in total). do I need to do this procedure on all 4 sides? or just 1 rear side. I'm very confused with this. Please help me!
@@nicke2307 with the McLaren tool but since making this video I've discovered you do not need to do anything. It still allows fluid through enough to bleed and fill
How do you know when to cut off the fluid on the refill? Wont opening up the accumulator or spraying compressed air into the system release the nitrogen????
Wow, you just clearly have no idea what you're doing. 1. Pressure equalizes. You open the valves with 120psi and guess what, then the whole system will have 120psi and it stops itself you put more or less pressure and it equalizes. 2. The nitrogen is in a bladder in the accumulator. If you take the accumulator off and jam a screwdriver in it, then you'll release the nitrogen. That's stupid to think the nitrogen just comes out. You have no idea how an accumulator works. They've been in cars since the 80s. Cmon this is so basic. Spraying compressed air in with the lines out just cleans out the fluid because a vacuum can't remove fluid without airflow. This is my final help to you. Good luck.
The system does not flow back to the reservior. Once the Accumulators fail, they release nitrogen into the system. Since It terminates at the accumulators which are the highest points of the system, the gas is stuck in the system. When there is air, it will not hold pressure. That's why it must be vacuumed and also pressure filled. It will not run the pump if there is no pressure in the system. From my understanding.
@@HollywoodMechanic I had disconnected one of the line without knowing while i did suspension lowering springs install. Reconnect and refill fluid in reservoir. System is ok after that. Of course I got sprayed with high pressure ch11s . I feel your rigged system bleed is Genius
@@YouStupid69 the pump will raise the pressure and draw fluid from the reservoir to do so but there is no return flow so the air in the system is trapped. This air is compressible. If you do not bleed it, the system will add some fluid and reach operational pressure, however, since the trapped air is compressible, it will soften the suspendion further than designed. The system has no way of knowing there is air present but you might feel an uneven compression or rebound damping. From my understanding. The lines and accumulators are at the top of the hydraulic system. And there is no through flow so the air does not come out
@@HollywoodMechanic I seen fluid reservoir overflow and leak out when accumulators broke. I don't mess with mclaren rubber accumulators, but I work with JRZ suspension w/ quick released piston style accumulators alot ..
This video is not for you to do at home. It's to help a mechanic that knows electricity, Hydraulic systems and accumulators to be able to do it. I'm not here to teach you all the basic knowledge you should learn in school. But if you follow what I say, it will work
have you had any issues ? After using this method to bleed the system? Like any indicators or warning lights that came back on suddenly but then it goes awau after couple of minutes.
No. The suspension has been perfect ever since. No lights on the dash. No pending, intermediate or permenant faults. All suspension modes operate normally. There is no air in the system using this method and is the same method the dealer uses. They have a machine that stimulates all the things I show you here.
I think it was about 3 quarts if you completely drain the reservoir. I don't exactly know because I put 5 quarts in the pressure vessel before filling it. But I've also done 3 system vacuum fills with that vessel and not refilled it. Most of the fluid comes from draining the reservoir to replace. Just be warned also that the hard lines in the back where the fittings go are leaking on older cars. I've replaced two of those and they leak where the flex part bends down to meet the lines that go to the front. Literally sprays out of the braided hoses. Probably should replace those at the same time if you are planning on keeping the car.
Could you explain how this whole system works in this Tenneco item?
Is the procedure the same as the MP4-12C w/o front lift? I just replaced all 4 accumulators and lost a lot of fluid. I filled up quite a bit at the revisor but needs to be bled. There's 1 bleeder screw on each side by the shock (4 in total). do I need to do this procedure on all 4 sides? or just 1 rear side. I'm very confused with this. Please help me!
Can all the solenoid manipulation be done with a scan tool?
@@nicke2307 with the McLaren tool but since making this video I've discovered you do not need to do anything. It still allows fluid through enough to bleed and fill
How do you know when to cut off the fluid on the refill? Wont opening up the accumulator or spraying compressed air into the system release the nitrogen????
Wow, you just clearly have no idea what you're doing. 1. Pressure equalizes. You open the valves with 120psi and guess what, then the whole system will have 120psi and it stops itself you put more or less pressure and it equalizes. 2. The nitrogen is in a bladder in the accumulator. If you take the accumulator off and jam a screwdriver in it, then you'll release the nitrogen. That's stupid to think the nitrogen just comes out. You have no idea how an accumulator works. They've been in cars since the 80s. Cmon this is so basic. Spraying compressed air in with the lines out just cleans out the fluid because a vacuum can't remove fluid without airflow. This is my final help to you. Good luck.
Great video can you change without bleeding the whole system on a 720s ?
The system does not flow back to the reservior. Once the
Accumulators fail, they release nitrogen into the system. Since It terminates at the accumulators which are the highest points of the system, the gas is stuck in the system. When there is air, it will not hold pressure. That's why it must be vacuumed and also pressure filled. It will not run the pump if there is no pressure in the system. From my understanding.
Yes system will self bleed
@@HollywoodMechanic I had disconnected one of the line without knowing while i did suspension lowering springs install. Reconnect and refill fluid in reservoir. System is ok after that. Of course I got sprayed with high pressure ch11s . I feel your rigged system bleed is Genius
@@YouStupid69 the pump will raise the pressure and draw fluid from the reservoir to do so but there is no return flow so the air in the system is trapped. This air is compressible. If you do not bleed it, the system will add some fluid and reach operational pressure, however, since the trapped air is compressible, it will soften the suspendion further than designed. The system has no way of knowing there is air present but you might feel an uneven compression or rebound damping. From my understanding. The lines and accumulators are at the top of the hydraulic system. And there is no through flow so the air does not come out
@@HollywoodMechanic I seen fluid reservoir overflow and leak out when accumulators broke. I don't mess with mclaren rubber accumulators, but I work with JRZ suspension w/ quick released piston style accumulators alot ..
polarity for activating the solenoid? both plug wires same color ???
This video is not for you to do at home. It's to help a mechanic that knows electricity, Hydraulic systems and accumulators to be able to do it. I'm not here to teach you all the basic knowledge you should learn in school. But if you follow what I say, it will work
have you had any issues ? After using this method to bleed the system? Like any indicators or warning lights that came back on suddenly but then it goes awau after couple of minutes.
No. The suspension has been perfect ever since. No lights on the dash. No pending, intermediate or permenant faults. All suspension modes operate normally. There is no air in the system using this method and is the same method the dealer uses. They have a machine that stimulates all the things I show you here.
Can you tell me approximately how much fluid it takes to refill the system ??
I think it was about 3 quarts if you completely drain the reservoir. I don't exactly know because I put 5 quarts in the pressure vessel before filling it. But I've also done 3 system vacuum fills with that vessel and not refilled it. Most of the fluid comes from draining the reservoir to replace. Just be warned also that the hard lines in the back where the fittings go are leaking on older cars. I've replaced two of those and they leak where the flex part bends down to meet the lines that go to the front. Literally sprays out of the braided hoses. Probably should replace those at the same time if you are planning on keeping the car.
@@HollywoodMechanic Thank you.
Thanks for the informative videos!
Hi good evening brother
I have 2018 McLaren 720s , I changed the hydraulic pump unit but I can't bleed it. The pump working in on/ off continuously. How bleed this system
@@radhakrishnan3462 just watch the video. You need to build a machine like I show in he diagram. It's very simple