That was a good little video, thanks - straight to the point. A video on bleeding these things would be good, too. I have manage to do so through trial and error, even without a computer, but the correct way to do it in practice remains somewhat of a mystery, (along with all the parameters and whys and wherefores of each step).
@@Speelbird all the videos on the topic say whatever you do, don't mess with the ABS unit. I gave up after all else and undid each pipe to it in turn, right at the ABS unit. This worked the air out, though we had to do it a number of times. I have subsequently been told that after fitting a new brake caliper, A) never pump the brake lever at all until the caliper has bled by gravity, it takes 5-10 mins to run through the pipes from the reservoir with the bleed nipple left open and B) never pump the brake pedal hard to the bottom or anywhere further than its normal travel, or the piston will likely seize at a point it is not used to going to after years of use.
A very good illustration , but I still don't understand how the ABS unit can reroute the fluid back to the master cylinder when the brake pressure is being applied from the master cylinder? I understand that the hydraulic force has to be diverted somewhere and there is nowhere it can really go , but going back against the force that is sending it to start with is hard to understand. Not meaning to discredit this video at all, I still just don't understand how that can work.
I don’t think this video discusses the role of the abs pump well. This might be wrong, but this is how I understand the mechanism. When a tire begins slipping, a valve in the abs module closes preventing additional hydraulic pressure from building up on that caliper. Basically it maintains the current pressure. But if the wheel locks up, then another valve opens that causes the abs pump to push back on the master cylinder helping to lower caliper pressure. Also, I think the abs pump provides additional pressure beyond what the master cylinder can do so that a particular wheel that’s rotating faster than the others can be slowed. I’m not totally sure about these details but would be interested in other’s thoughts. So I guess to answer your specific question, I do think the abs pump essentially pushes back on the pressure from the MC to decrease pressure to a particular caliper. I wouldn’t say that it is pushing fluid back into the MC, but rather just decreasing the pressure exerted by the MC. Maybe?
@@Pseudify **You are right** ; the ABS modulator, its PUMP, is PUSHING FLUID BACK TO THE Master Cylinder, it CREATES MORE pressure than the brake pedal; it is powerful, the FUSE for the pump is 40 or 50 AMPS!!!! at 12 volts; and YOU KNOW IT DOES THAT pushing back 6 to 10 times a SECOND=== HOW? notice how the brake pedal P U L S A T E S under your foot; obviously there is a backwards force GREATER than the one you are exerting. It is a miracle(not the BS religions invent, no, this is a REAL one, there are many more) (sorry for the caps, --i will edit that out--).
@@josepeixoto3384. Good points. By the way, I noticed your last name. Are you familiar with the Peixoto coffee family? I think their farm is in Brazil, maybe, or somewhere in South America.
Hello, thanks for the good video. Is it possible for the ABS module to work with only one speed sensor? Actually, I am a student and I want to present the operation of ABS with a single tire and a brake unit using a single speed sensor.
I'm thinking you could, here's another good video that describes abs in another way. I think you'd have to block the other holes where the other brake lines go and bleed it. ua-cam.com/video/IKi5O3ZlSu4/v-deo.html
Not a very useful description. Doesn't even mention how the system builds pressure back up after releasing it, in fact it's misleading. [Edit] Actually the biggest missing piece is how pressure is relieved on the caliper, ie: the function of the ABS pump. See replies to this comment.
@@nuduw Wrong. The video doesn't explain the function of the ABS pump, the spinning thing at the top right. Doesn't even mention it. Without the pump, pressure would never decrease on the caliper piston, since the pedal is still applying pressure on the master. You can't explain ABS without explaining the pump. So I phrased my original complaint wrong - because I didn't understand enough from the misleading narration. It's actually not the building of pressure back up that's misleading (though it's glossed over), it's the releasing of pressure! I think I understand it now after watching the video about 30 times and inferring a lot of stuff. The solenoid doesn't just open a passage to the master cylinder - that's open normally anyway and wouldn't do anything. It opens a passage to the ABS pump, which PULLS pressure from the caliper piston and pumps it back into the master cylinder, against the pressure of your foot on the pedal! The ABS pump pumps up the pedal! THIS is why the pedal vibrates. Then when the solenoid releases to its resting position, the passage from the master is opened again, and your foot pressure applies pressure on the caliper piston again. Then the cycle repeats with the abs pump sucking pressure away from the caliper piston again. But let me know if you have a better understanding. I stand by my statement that the narration is pretty much useless and actually misleading if you want a proper understanding.
For somebody with no idea of how the anti-brake blockage system works, this is an excellent video...
Thanks for watching
I learned about the anti-lock break system when I rear ended another vehicle.
This was simply awesome!
That was a good little video, thanks - straight to the point. A video on bleeding these things would be good, too. I have manage to do so through trial and error, even without a computer, but the correct way to do it in practice remains somewhat of a mystery, (along with all the parameters and whys and wherefores of each step).
So, how did you bleed it correctly? I need answers 😄 Got the same issue
@@Speelbird all the videos on the topic say whatever you do, don't mess with the ABS unit. I gave up after all else and undid each pipe to it in turn, right at the ABS unit. This worked the air out, though we had to do it a number of times. I have subsequently been told that after fitting a new brake caliper, A) never pump the brake lever at all until the caliper has bled by gravity, it takes 5-10 mins to run through the pipes from the reservoir with the bleed nipple left open and B) never pump the brake pedal hard to the bottom or anywhere further than its normal travel, or the piston will likely seize at a point it is not used to going to after years of use.
@@Speelbird use the brake pedal a lot to bleed the ABS, but just be careful with how far you push it. 2 man job. But it works.
We did have the engine running and heard the ABS come on as it bled, without using a computer to cycle it, which is what workshops do.
Thanks alot for this little info.
A very good illustration , but I still don't understand how the ABS unit can reroute the fluid back to the master cylinder when the brake pressure is being applied from the master cylinder? I understand that the hydraulic force has to be diverted somewhere and there is nowhere it can really go , but going back against the force that is sending it to start with is hard to understand. Not meaning to discredit this video at all, I still just don't understand how that can work.
I don’t think this video discusses the role of the abs pump well. This might be wrong, but this is how I understand the mechanism. When a tire begins slipping, a valve in the abs module closes preventing additional hydraulic pressure from building up on that caliper. Basically it maintains the current pressure. But if the wheel locks up, then another valve opens that causes the abs pump to push back on the master cylinder helping to lower caliper pressure. Also, I think the abs pump provides additional pressure beyond what the master cylinder can do so that a particular wheel that’s rotating faster than the others can be slowed. I’m not totally sure about these details but would be interested in other’s thoughts. So I guess to answer your specific question, I do think the abs pump essentially pushes back on the pressure from the MC to decrease pressure to a particular caliper. I wouldn’t say that it is pushing fluid back into the MC, but rather just decreasing the pressure exerted by the MC. Maybe?
@@Pseudify **You are right** ; the ABS modulator, its PUMP, is PUSHING FLUID BACK TO THE Master Cylinder, it CREATES MORE pressure than the brake pedal; it is powerful, the FUSE for the pump is 40 or 50 AMPS!!!! at 12 volts;
and YOU KNOW IT DOES THAT pushing back 6 to 10 times a SECOND===
HOW? notice how the brake pedal P U L S A T E S under your foot; obviously there is a backwards force GREATER than the one you are exerting.
It is a miracle(not the BS religions invent, no, this is a REAL one, there are many more)
(sorry for the caps, --i will edit that out--).
@@josepeixoto3384. Good points. By the way, I noticed your last name. Are you familiar with the Peixoto coffee family? I think their farm is in Brazil, maybe, or somewhere in South America.
Exellent😊
would like it to first introduce each part and its function
Hello, thanks for the good video. Is it possible for the ABS module to work with only one speed sensor? Actually, I am a student and I want to present the operation of ABS with a single tire and a brake unit using a single speed sensor.
I'm thinking you could, here's another good video that describes abs in another way. I think you'd have to block the other holes where the other brake lines go and bleed it. ua-cam.com/video/IKi5O3ZlSu4/v-deo.html
very useful
I m very hungryyy
Hii
Meh
teu ngarti
Not a very useful description. Doesn't even mention how the system builds pressure back up after releasing it, in fact it's misleading. [Edit] Actually the biggest missing piece is how pressure is relieved on the caliper, ie: the function of the ABS pump. See replies to this comment.
1:38
lol looks like u have watched less than half of the video
@@nuduw Wrong. The video doesn't explain the function of the ABS pump, the spinning thing at the top right. Doesn't even mention it. Without the pump, pressure would never decrease on the caliper piston, since the pedal is still applying pressure on the master. You can't explain ABS without explaining the pump. So I phrased my original complaint wrong - because I didn't understand enough from the misleading narration. It's actually not the building of pressure back up that's misleading (though it's glossed over), it's the releasing of pressure! I think I understand it now after watching the video about 30 times and inferring a lot of stuff.
The solenoid doesn't just open a passage to the master cylinder - that's open normally anyway and wouldn't do anything. It opens a passage to the ABS pump, which PULLS pressure from the caliper piston and pumps it back into the master cylinder, against the pressure of your foot on the pedal! The ABS pump pumps up the pedal! THIS is why the pedal vibrates. Then when the solenoid releases to its resting position, the passage from the master is opened again, and your foot pressure applies pressure on the caliper piston again. Then the cycle repeats with the abs pump sucking pressure away from the caliper piston again.
But let me know if you have a better understanding. I stand by my statement that the narration is pretty much useless and actually misleading if you want a proper understanding.
@@nuduw lol looks like you don’t have a rebuttal for @steelddd after HALF A YEAR LMAOOO be gone troll
@@steelddd well put bro. videos like this are being used in schools like UTI and WyoTech. the video is 30% informative (barely) and 70% uninformative.