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#1
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Bleeding Brakes (spongey feeling)
I installed my new 400E 4pot front calipers on my 87 260E but the brakes are very spongy. I have to put it all the way to the floor for it to even "feel" like it is braking. I replaced rotors + pads + fluid + brake lines...but this is not a bedding in mistake. The brakes are beyond normal for new rotors and pads -- Far, far too spongy.
I figure it is air in the lines and I may need to bleed the brakes again. I was using a motive power bleeder before...How do I know when to stop bleeding since the fluid is new in there and how can I make sure there is no air? (It was my 1st time bleeding so maybe I made a mistake?) Any other ideas on why it could be spongy? Thanks
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#2
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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123. |
#3
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......Oh yeah......If you disconnect the power bleeder from the system wrong, I think you will force air into the lines. As the directions should state, if there is any fluid left in the bottom of the bleeder after bleeding, tilt the bottle to the side and unscrew the bottle cap, not the MC connection, to release pressure. Then you are safe to unscrew it from the MC. This is just my re-collection of the directions, its been a few years since I last used my Motive unit. Could be completely off base.
I'm sure you know to start at the farthest wheel away from the MC and work your way to the closest (gotta ask, since it's your first bleeding ).
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http://i193.photobucket.com/albums/z...-RESIZED-1.jpg 1991 300E - 212K and rising fast... |
#4
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Ahhh maybe that is where I went wrong. I ran out of fluid so I opened the bottle and filled it back up?
I'll definitely get that ATE Blue so I can tell the difference.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#5
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*****. Well there's your problem! If you run out of fluid, you end up pumping air into the lines for sure. You have to fill it up with more than you need. Can't fill it in the middle or you gotta start over. .
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http://i193.photobucket.com/albums/z...-RESIZED-1.jpg 1991 300E - 212K and rising fast... |
#6
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I'll make sure to put in 3 quarts this time and not to open it Fingers crossed that is the only issue!! I DID feel the ABS kick on on a hard stop on the front calipers, so I don't think they are bad...It's gotta just be a fluid issue.... Will bleed tomorrow and let you guys know if that did the trick. That ATE Blue is probably a dealer/online item right? Doubt local stores would carry something like that?
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#7
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Running out of fluid in the bleeder will not introduce air into the lines UNLESS you also let the reservoir get low on fluid.
I use a Motive bleeder for flushing brakes, but I've never used it for bleeding brakes after the system has been opened. In that case I use the two man system. Depending on the person at the pedal, you may even have to do it with the engine running. If you do run the engine, set the ebrake, block the wheels and have a brake pumper that you can trust. This is not the time to use an 8 year old. |
#8
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#9
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Nah, where you "went wrong" is in failing to match master cylinder with slave cylinders, i.e. the calipers.
400E calipers work best with 400E master cylinder--as designed.
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Kent Christensen Albuquerque '07 GL320CDI, '10 CL550. '01 Porsche Boxster Two BMW motorcycles |
#10
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We just installed new back calipers yesterday. I was pumping the brakes while my dad bled them. But the brake pedal feels lifeless and i have to push it down pretty far to get good braking. I guess we still have air in the line and have to rebleed them?
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#11
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Quote:
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#12
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Got it
There was about 5+ big air bubbles that came out the rear and a couple on the front. I must have done it wrong somehow...Can't learn without making mistakes as I have found out quite well this past year... HUGE difference. Everything is back to the way I would suspect it to be. But hot dang this thing stops GREAT!
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#13
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You learn from experience, and you get experience by making mistakes.
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