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10-02-2010, 04:46 PM | #1 |
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Help...Leak in brake system?
I am flushing out my brakes now with the vacuum method. I started by sucking the old fluid out with my vacuum extractor, topped it up and began on the first brake. I attached the vacuum to the nipple on the caliper loosened it a 1/4 turn and started the pump with 3-5 pumps to get pressure.
While it is sucking the fluid there is a constant stream of fluid and air bubbles as I'm keeping the fluid above the min line and have gone through a 500ml bottle for one brake so far. Could there be a leak in the brake system? The fluid level has stayed the same for over a year now though Thx for any help or suggestions.
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10-02-2010, 06:51 PM | #2 |
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LOL. I am not being mean. The bubbles of air sneak in between the tube you attached to the nipple and the nipple. I assume they are tiny bubbles. Normal, and stop wasting brake fluid. At least by now you flushed the system, and all you need to do is bleed the remaining calipers.
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10-02-2010, 09:13 PM | #3 |
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No offense taken.. Apologies if this is a stupid questions for most but its my first time using a vacuum system as I usually use the 2 person method.
They are not really little bubbles but more like pulses of air, fluid, air, fluid... I seen videos of guys using the vacuum method and there are big streams of air bubbles, then tiny ones, and eventually nice stream of just fluid. TIA.
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10-03-2010, 12:50 AM | #4 |
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Perfectly normal when using vacuum buddy; no worries. Just don't let fluid level drop much below the min mark, or you risk sucking air. And don't open the valves more than about 1/4 of the way. It's not critical, but you should start with the farthest valve, and finish with the closest, which means RR, LR, RF, LF. And don't forget the clutch if you have a 6MT.
I prefer vacuum than anything else, and it's a one-man job, but it's a matter of preference. The braking system is designed to be pressurized from the master cylinder down, not from the reservoir, so I'll never use a pressure bleeder myself. And will never use those 'speed bleeders' either . Good luck. |
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10-03-2010, 01:28 AM | #5 | ||
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Quote:
Quote:
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10-03-2010, 12:40 PM | #6 |
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Don't worry about those bubbles man, or you'll go crazy. The effect is the same when you're trying to suck the last drops from a glass with a straw. And the sound is similar too, but more muted. ANY pressure method (positive or negative -a.k.a. vacuum) is going to create bubbles as fluid goes thru the nipple, creating turbulence. And that includes pushing the brake pedal... unless you do it VERY slowly to avoid gushing fluid through the valve, and with the hose pointing up (and going over the tire, like I always do). That's the way I do it on my motorcycles because it only takes a few strokes, and I can do it by myself.
Since you're not supposed to store an open container of brake fluid, just finish off the bottle (1L) and you won't have to worry about any bubbles . Don't expect the brakes to feel any better if you had no air inside, but they shouldn't feel any worse either. Check that brake pedal is hard, then go for a drive after you're done. You don't have to worry about any bubbles unless you replaced brake lines or suck air while bleeding. Then you have to make sure there're no bubbles, and sometimes that requires a reverse fill. And if pedal is still spongy, then you need dealer to activate the ABS/DSC pump (and also push caliper pistons all the way in). But you don't have to worry about that now . Good luck man. |
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10-05-2010, 08:11 AM | #8 | |
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Good point, but I've never had any issues with a pressure bleed.
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