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ABS Service

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Old Mar 5, 2025 | 10:49 PM
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ABS Service

To those that have sprung a leak and drained their whole brake system, how many ABS service cycles did you go through after refilling and bleeding the system? I haven’t been able to find a number. I’m using Forscan to perform the service. I ran two ABS cycles so far and it’s good, but maybe a bit of fade when sitting at a long light, like I have to keep applying more pressure so it doesn’t creep. There’s no leaks and I’m not dropping on reservoir level. Thanks for any input.
 
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Old Mar 5, 2025 | 11:38 PM
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With air, once you compress any air bubble to the fluid pressure, there will be no more pedal drop. If you’ve stroked an old master cylinder during bleeding to the point where it goes into the deeper part of the bore that may have corrosion, you can nick the seal so it has a small internal leak—bypassing the seal. You won’t lose fluid (internal leak), but the pedal can drop off.
 
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Old Mar 6, 2025 | 09:24 AM
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Originally Posted by TooManyToys.
With air, once you compress any air bubble to the fluid pressure, there will be no more pedal drop. If you’ve stroked an old master cylinder during bleeding to the point where it goes into the deeper part of the bore that may have corrosion, you can nick the seal so it has a small internal leak—bypassing the seal. You won’t lose fluid (internal leak), but the pedal can drop off.
Thanks. I did stroke the pedal fully before watching some videos warning against that; I assumed that leak would show up on the plunger shaft in the cab, which it’s not. I may be replacing the master cylinder next then, I thought I was good.
 
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Old Mar 6, 2025 | 11:51 AM
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There are multiple seals in the master cylinder. Other than the back seal, there are two for each of the two chambers. When these leak, there is no exterior fluid loss.



 
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Old Mar 6, 2025 | 11:55 AM
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Just a FYI, Forscan may not.be functional. Mine doesn't work any longer.
 
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Old Mar 6, 2025 | 02:54 PM
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Originally Posted by Motohead911
Just a FYI, Forscan may not.be functional. Mine doesn't work any longer.
Weird, I just downloaded it for the first time ever like a week ago and I've been able to monitor and do a decent amount of tests that I didn't have access to with my Edge. Are you using Android or a laptop?
 
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Old Mar 6, 2025 | 02:56 PM
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Originally Posted by TooManyToys.
There are multiple seals in the master cylinder. Other than the back seal, there are two for each of the two chambers. When these leak, there is no exterior fluid loss.

It looks like it might be worth replacing it just as a preventative, they don't seem too expensive from what I found and essentially everything else with the brakes is new at this point. Thanks for the diagram.
 
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Old Mar 6, 2025 | 03:22 PM
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Originally Posted by BigGreenEx
Weird, I just downloaded it for the first time ever like a week ago and I've been able to monitor and do a decent amount of tests that I didn't have access to with my Edge. Are you using Android or a laptop?
I checked with android, haven't checked on the laptop. if i plan out the laptop, i just use IDS.
 
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Old Mar 6, 2025 | 04:26 PM
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Originally Posted by BigGreenEx
It looks like it might be worth replacing it just as a preventative, they don't seem too expensive from what I found and essentially everything else with the brakes is new at this point. Thanks for the diagram.
To me, its a critical wear item. They do go bad.
 
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Old Mar 6, 2025 | 04:40 PM
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Originally Posted by Motohead911
I checked with android, haven't checked on the laptop. if i plan out the laptop, i just use IDS.
Do you pay for the subscription, work for a dealer, or how do you access IDS affordably? I'm interested.. Thanks.
 
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Old Mar 7, 2025 | 08:02 PM
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While more expensive than Forscan, the Autel MaxiCheck will do the ABS bleeding procedure on these trucks (and other vehicles too, like I have Jeep JK and it works for it as well).

Costs less than $200 (currently on sale for $160 ) and it’s an actual shop scan tool, not a laptop computer with an ODB2 interface, it’s a standalone scanner. I use it on all the mid to late 2000's era vehicles in my little personal fleet when I need to play with the ABS pump to bleed brakes.

https://store.autel.com/products/aut...iABEgKqS_D_BwE
...
 
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Old Mar 7, 2025 | 08:25 PM
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Originally Posted by 4Kids
Do you pay for the subscription, work for a dealer, or how do you access IDS affordably? I'm interested.. Thanks.
I have a clone VCM that works.
 
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