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Old 07-21-2009, 03:27 PM   #1
TimStevens
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Default Replacing calipers - block hose?

Hey, hoping to replace the rear calipers on my 02 soon. Am wondering if I need to do anything to prevent fluid loss after I disconnect the hoses. Most guides don't say anything, but one guide said to thread a bolt through and close it with a nut to stop fluid loss, and another shows to use a pair of vice-grips to clamp on the hose... doesn't seem advised on 8+ year old rubber to me...

Anyway, should I worry about it? Obviously I'll put a drain pan down and will be bleeding the brakes, but do I need to worry about the master cyl. drying out?

Thanks,

-tim
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Old 07-21-2009, 04:37 PM   #2
rick-l
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I have never done this on my WRX but I think if you put a board against the seat and slide it into the brake pedal to push it down part way the fluid will not run out.

I wouldn't worry about the master cylinder drying out but I would worry about getting air into the ABS which I don't think is desirable.

Does anyone know the Motive Products adapter that fits a WRX so you don't have to use that universal adapter with the chain?
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Old 07-21-2009, 04:45 PM   #3
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Wow, pushing the pedal in would keep the fluid from running? How so? I'd think that'd make it flow more.
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Old 07-21-2009, 04:55 PM   #4
rick-l
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Quote:
Originally Posted by TimStevens View Post
Wow, pushing the pedal in would keep the fluid from running? How so? I'd think that'd make it flow more.
I think it moves the piston in front of the hole that it fills from the resevoir
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Old 07-21-2009, 04:59 PM   #5
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Ahh, interesting...
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Old 07-21-2009, 05:56 PM   #6
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I just replaced the calipers in my wifes obs and didn't lose much fluid. We just unhooked the brakelines. You will lose a little fluid but since you have to rebleed due to dry calipers it won't matter. We even accidently hit the brake pedal and didn't notice much fluid loss. You should be fine just unhooking the calipers.
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Old 07-21-2009, 06:51 PM   #7
TimStevens
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Okay, thanks. Sounds like so long as I don't spend hours with the caliper disconnected I should be okay.
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Old 07-22-2009, 03:18 AM   #8
Charlie-III
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Quote:
Originally Posted by TimStevens View Post
Okay, thanks. Sounds like so long as I don't spend hours with the caliper disconnected I should be okay.
Yep, just have the new caliper ready when you remove the line from the old caliper. You should only lose a few drops of fluid.

Now would be a good time to do SS lines as well if the others are 8+ years old.
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Old 07-22-2009, 09:20 AM   #9
TimStevens
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Tempting, I'm already spending enough on this brake job as it is

Did I mention as soon as I get done on the WRX I have to turn around do the brakes on my MR2. Ugh.
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Old 07-22-2009, 09:34 AM   #10
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Brake fluid is cheap, just put a drain pan under it and let it drain a bit.
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Old 07-22-2009, 09:53 AM   #11
TimStevens
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Oh I'm not worried about losing fluid, I'll go through a bottle bleeding all four corners anyway. I'm just worried about getting air deep in the system.
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Old 07-24-2009, 01:25 PM   #12
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Quote:
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Oh I'm not worried about losing fluid, I'll go through a bottle bleeding all four corners anyway. I'm just worried about getting air deep in the system.
That is generally something to be worried about.

As others said, if you have the new caliper ready to go on and as you said, as long as you don't spend hours with them disco'ed, you'll be fine.

HTH.
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Old 07-24-2009, 09:39 PM   #13
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Just let it all out. You may as well just flush the complete brake system will fresh new fluid. It's not that expensive anyways. and you get improve pedal feel.
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Old 07-25-2009, 01:30 AM   #14
Charlie-III
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Just let it all out. You may as well just flush the complete brake system will fresh new fluid. It's not that expensive anyways. and you get improve pedal feel.
Flushing/bleeding is one thing, draining and then refilling is another. Unless, of course, you have a power bleeder.
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Old 08-13-2009, 10:10 AM   #15
TimStevens
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I did the deed last weekend, and it was indeed pretty easy. I was expecting a high-pressure surge of brake fluid for some reason, but it was just a little dribble. Plenty of time to clean off the mating surfaces of the brake line and put on the new caliper without losing too much fluid. Only real problem was stuck rear rotors (parking brake was off), but with a little help from Mr. Blow Torch and Mrs. 8lb Sledge they popped off.

Old:



New:



The reason I was replacing them is because I believed one side had seized.I was getting some awful noises and it wasn't cleaning the rotor off, so I thought that side had stuck on and wore the pad down. I had just checked the pad material when I swapped summer wheels on a few months ago and there was plenty left at that time, so that was my conclusion. Imagine my surprise when I found out that the braking material had actually separated from the backing plate and fallen out.



You can see what's left of the backing plate on the left, and the material that came falling out of the caliper on the far right (it was cracked in a few pieces). I'm pretty sure these are Hawk pads, which I won't be buying again for obvious reasons.
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