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Old 12-12-2019, 03:21 PM #16
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Quote:
Originally Posted by snydmax View Post
Fordtechmakaluko's main points:

1. Fluid recevoir in caliper hold fluid that doesn't circulate
2. It gets hot (not boiling) and is constantly heat cycling.
3. Risk is to ABS Hydraulic Control Unit (not wheel sensors) if you manage to push the "contaminated" brake fluid up into that system
4. Opening the bleeder expels this fluid instead of pushing it up back into the brake lines
5. Using a brake bleeder further allows you to remove the fluid in the caliper reservoir replacing it with clean fluid from the master cylinder... short of performing a full flush.

Do what you want, I'll continue to take this extra preventative step on my vehicles.

Sorry OP for hyjacking your thread! Hope you find out what's up without too much $$ and trouble
absolutely. not pushing that nasty fluid back up into the system is the preferred way. I do this with all my customer cars.
its a nice little mini bleed. gets the old trash fluid out, and replaced with nice fresh stuff.


however, to the OP, not doing it will not damage the booster in any way. the concern is with the ABS module, and less so, the MC itself.
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Old 12-12-2019, 03:23 PM #17
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Quote:
Originally Posted by Bad Luck View Post
It's possible, but unlikely that changing brake pads would cause it to start leaking vacuum. You typically hear a whistle type noise when a brake booster doesn't fail completely. If the master cylinder was leaking into the booster the pedal would slowly fall when applied without vacuum in the booster. My bet is the rotors are gouged and the flat pads don't have a flat rotor to press against so all the brake pad material isn't in contact with all of the rotor.
Good points. Cheap brake pads will make a hissing sound even on good rotors I've noticed. More on my bikes than cars but same thing. Some people equate it to cicada's making their unique noise.
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Old 12-12-2019, 04:05 PM #18
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Quote:
Originally Posted by snydmax View Post
Fordtechmakaluko's main points:

1. Fluid recevoir in caliper hold fluid that doesn't circulate Why is this a problem?
2. It gets hot (not boiling) and is constantly heat cycling. The fluid is meant to take the heat. Again, what's the problem?
3. Risk is to ABS Hydraulic Control Unit (not wheel sensors) if you manage to push the "contaminated" brake fluid up into that system He never explains how the fluid is contaminated, so how is the fluid contaminated?
4. Opening the bleeder expels this fluid instead of pushing it up back into the brake lines I'm aware of how the bleeder works, but there's no issue with pushing the fluid back through the lines.
5. Using a brake bleeder further allows you to remove the fluid in the caliper reservoir replacing it with clean fluid from the master cylinder... short of performing a full flush. This is true, but I would rather flush my brakes once every 5 years than have to bleed them every time I did my brakes because I cracked a bleeder valve. If you don't open the bleeder then there is no need to bleed the brakes again.

Do what you want, I'll continue to take this extra preventative step on my vehicles.

Sorry OP for hyjacking your thread! Hope you find out what's up without too much $$ and trouble
Points in bold. If it makes you feel better to do it that way then feel free. My point is that it's bad information saying that it's required or that you're supposed to be doing brake work that way. It may be better for people that don't flush their brake fluid often enough, but it's not included in the work being performed if the service is taking place at a shop. I've never had any issue or seen an issue caused by pushing the brake fluid back through the brake lines.
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Old 12-12-2019, 04:46 PM #19
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Quote:
Originally Posted by Bad Luck View Post
Points in bold. If it makes you feel better to do it that way then feel free. My point is that it's bad information saying that it's required or that you're supposed to be doing brake work that way. It may be better for people that don't flush their brake fluid often enough, but it's not included in the work being performed if the service is taking place at a shop. I've never had any issue or seen an issue caused by pushing the brake fluid back through the brake lines.
I have encountered multiple ABS units failing immediately following a brake job.


however, for many years prior to those, not a single issue. it only took those few for me to change how I do things.
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Old 12-12-2019, 05:01 PM #20
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Quote:
Originally Posted by nevada View Post
I have encountered multiple ABS units failing immediately following a brake job.


however, for many years prior to those, not a single issue. it only took those few for me to change how I do things.
Interesting. This is the first I've encountered anyone that has had issues.
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