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Old 09-26-2009, 03:51 PM   #1
Mizzou
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Default Bleed brakes after changing rotor/pads?

Why do people recommend bleeding brakes when changing rotor/pads? IF the caliper is removed but no air is added to the system by messing with the brake fluid hoses, what benefit does bleeding provide other then I guess the possibility they already had air in them to begin with?

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Old 09-26-2009, 04:03 PM   #2
RichBrown
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Default Re: Bleed brakes after changing rotor/pads?

I never have.. As long as you dont let air in the line, ie removing the brake lines I dont see the point in messing around with it.. Someone may have a technical overview though..

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Old 09-26-2009, 07:32 PM   #3
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Default Re: Bleed brakes after changing rotor/pads?

While it's not needed, per se, I think it's a good idea when doing a pad replacement to clean out the crud that's built up over time. If you compare the color of fresh brake fluid (clear, slightly yellow-ish) to what's in your system, you'll realize the wisdom in getting the old stuff out and some fresh stuff in its place.

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Old 09-26-2009, 10:09 PM   #4
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Default Re: Bleed brakes after changing rotor/pads?

Quote:
Originally Posted by Mizzou View Post
Why do people recommend bleeding brakes when changing rotor/pads? IF the caliper is removed but no air is added to the system by messing with the brake fluid hoses, what benefit does bleeding provide other then I guess the possibility they already had air in them to begin with?
you don't need to bleed the brakes after replacing pads and rotors.

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Old 09-26-2009, 10:30 PM   #5
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Default Re: Bleed brakes after changing rotor/pads?

^ ^ ^ He's absolutely right. But only if the car's brake system is less than (approximately) 5-years old or hasn't been bled in that time. In other words, read the threads about those cars, here or anywhere else, that's never had brakes bled - they wind up with the same symptoms years after; brake pedal goes through to the floor. From the master cylinder corroded with old fluid retaining water absorbed through the years and pitting the cast iron bore hole. At the least, consider replacing the entire brake system fluids with a complete flushing every 5-years or when any bleeding is required from replacing a wheel cylinder or caliper, whichever occurs first. Then new fluid replaces old moisture absorbed fluid. Brakes, pads, shoes, calipers, drums, flushing, bleeding, adjustments, repairs, etc., require more than casual knowledge of brake systems and not for the unwilling not interested in complete brake maintenance. To think otherwise is foolish as in taking shortcuts to save a few dollars here or there. Keeping the entire brake system in proper perspective and then seeing where costs are saved will be easier to understand; by assuming all the responsibilities of brake maintenance, savings are immediately made from the labor paid to others doing the professional work. The savings made is from fully understanding the risks and responsibilities of complete brake maintenance.

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Old 09-26-2009, 10:32 PM   #6
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Default Re: Bleed brakes after changing rotor/pads?

The only benefit I see from bleeding you brakes every pad change (other then getting really good at it) is like MiSaturn said, getting old stuff out new fluid in. This way you never need a brake fluid flush that sometimes can actually mess up some valve in the system if done hastily. It also depends on other factors, like what area of the country (moisturewise) you live in, how often brake reservoir is opened for "inspection" , btw, another reason i do not use "help" in servicing my cars. It seems every time you go (used to go) for the oil change they pop the brake fluid cap and say "you need a fluid exchnage" $$ for them or just another opportunity for moisture to get in the brake fluid and cause corrosion in the system.

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Old 09-26-2009, 10:35 PM   #7
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Default Re: Bleed brakes after changing rotor/pads?

No point, Never had a problem leaving in the fluid when doing a basic brake job.. I only bleed when something in the system needs changing, wheel cyl, caliper, brake line..

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Old 09-26-2009, 10:44 PM   #8
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Default Re: Bleed brakes after changing rotor/pads?

this is becoming another "oil additives" thread, or at least it seems. Everyone is entitled to their own opinion, but there are other factors, like "can you do the bleeding where you live" what if someone lives in the apartment and can get kicked out if they cough him doing it (personal experience) or the weather is nasty enough that you just want to "get over it"
I am not trying to sound like a lawyer, but "It depends"
It for sure is NOT a requirement to do every brake job, just a nice preventive thing to keep in mind imo

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Old 09-26-2009, 11:55 PM   #9
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Default Re: Bleed brakes after changing rotor/pads?

A bleed is not necessary at all. Maintaining good quality fluid is a related, but separate, issue.

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Old 09-27-2009, 07:36 AM   #10
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Default Re: Bleed brakes after changing rotor/pads?

when a brake job is done on a car with ABS(this goes against everything that is said)but when you push the piston back in you should crack the bleeder so your not pushing dirty fliud back into the ABS unit.i know with the ford crown vic's if you do that you have to bleed thew whole system to get the brake light to go out. thats a real PITA.

i attach a tight fitting hose to the bleeder so when i crack the valve and push the piston in, no air gets in the system,that seems to work the best for me.

yes you need to open the master cylinder, but your putting in fresh fliud at that point.

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