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      12-07-2019, 07:16 AM   #1
M4_Johnnys
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Why pressure bleed brakes?

I might be missing something obvious here, but why is everyone using those power bleeders?

What's wrong with attaching a tube with a one way valve to the brake nipple and pumping the brakes?

Is the only advantage of using a pressure bleeder is that you don't have to go back and forth from pumping the brakes to topping up the reservoir to make sure you don't suck air into the system? Using a one way valve on the nipple still makes it an easy one man job?
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      12-07-2019, 08:14 AM   #2
allinon72
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Faster, easier, more fool proof. On most modern cars, if you get air in the ABS system it's not a good experience.

That being said, there's nothing wrong with the traditional method.
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      12-07-2019, 08:49 AM   #3
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Faster, easier, likelihood of getting air into the system is less.
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      12-09-2019, 07:35 AM   #4
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Pumping brakes via traditional method produces accelerated wear of the brake master cylinders as the piston travels further. Pressure bleeder typically gives a trouble free bleed, provided you don't overpressure. Suggest 10 -12 psi max.
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      12-10-2019, 12:44 PM   #5
FaRKle!
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Quote:
Originally Posted by JeffO View Post
Pressure bleeder typically gives a trouble free bleed, provided you don't overpressure. Suggest 10 -12 psi max.
BMW allows up to 2 bar / 29 PSI for pressure bleeding. That said, I don't see any benefit going above 20 PSI when I do it.
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      12-26-2019, 11:03 PM   #6
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Quote:
Originally Posted by FaRKle! View Post
BMW allows up to 2 bar / 29 PSI for pressure bleeding. That said, I don't see any benefit going above 20 PSI when I do it.
There's no benefit going above 12 PSI. The weak point isn't your car, but the bleeder hoses and connections.
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      01-10-2020, 02:54 AM   #7
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$ for $ the pressure bleed kit from Harbor Freight has to be among the top 3 tools in my garage, and I have a lot of tools. I use it for the same reasons as above. When something can be done correctly and in <5 minutes per side, you don't ask questions.
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      01-12-2020, 12:02 AM   #8
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Ive tried pressure bleaders in past with good luck, but on my e90 m and m4 i hav e shops do to cycle the ABS system as i havent gotten best pedal feel when doing myself.
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