Master Cylinder Problems......
04-27-03, 06:42 PM
#1
Master Cylinder Problems......
Ok, I've got a pretty big problem that I think that I have diagnosed, but I need to be sure. Once I am sure - what do I do? Here's the story:
My brakes have been poor for a while, and needed to be replaced. This weekend I put new rotors and pads on, and set about bleeding the whole system. I started at the right rear, and kept getting air bubbles. The fluid was coming out like soda - even when the new clean fluid started to come out! I was confused so I tried the left rear - same thing. No matter how much fluid I used, or which bleeding nipple I tried, I got clean fluid that was full of air.
I finally took a good look at the Master Cylinder Resevoir while the brakes were being pumped, and the fluid was foaming in the resevoir! If we pumped the brakes a bunch of times and then stopped, we could hear "PFFFFFFFTTTTT" noises and see bubbling in the resevoir..........
So I'm thinking that the seals in the Master Cylinder are finished - Anyone think any different?
That being said - What do I do? Do I buy a whole new MC? do I get a rebuild kit and just replace the seals? Do I get a reman MC? or do I go to a scrap yard and pick up a used one?
Anyone have any hints or tips for a MC repair/replacement?
Thanks for all the help!
My brakes have been poor for a while, and needed to be replaced. This weekend I put new rotors and pads on, and set about bleeding the whole system. I started at the right rear, and kept getting air bubbles. The fluid was coming out like soda - even when the new clean fluid started to come out! I was confused so I tried the left rear - same thing. No matter how much fluid I used, or which bleeding nipple I tried, I got clean fluid that was full of air.
I finally took a good look at the Master Cylinder Resevoir while the brakes were being pumped, and the fluid was foaming in the resevoir! If we pumped the brakes a bunch of times and then stopped, we could hear "PFFFFFFFTTTTT" noises and see bubbling in the resevoir..........
So I'm thinking that the seals in the Master Cylinder are finished - Anyone think any different?
That being said - What do I do? Do I buy a whole new MC? do I get a rebuild kit and just replace the seals? Do I get a reman MC? or do I go to a scrap yard and pick up a used one?
Anyone have any hints or tips for a MC repair/replacement?
Thanks for all the help!
04-27-03, 06:45 PM
#2
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It sounds like somethings not tight or not getting a good seal. I would guess that it's leaking break fluid whereever that pfffftt is coming from. That would be a good place to start.
04-28-03, 06:50 AM
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Originally posted by Nick86
Has anyone ever seen this?
Has anyone ever seen this?
Maybe it's a really small hole that's sucking air in?
Not sure what you could use to test for a small leak, because you don't want **** getting in your brake lines.
04-28-03, 08:49 AM
#6
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i just replaced mine cuz it was leaking, now the new one leaks in the same place, fortunatley the brakes still work perfect, just drip a little at the seal for the reservoir at the mc an the front
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04-28-03, 09:40 AM
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my 2 seals were leaking too, right now i have my reservior off and have bought new seals. My engine bay below the brake system was a mess from it leaking. I'll let you know if I have any problems tonight when I re-intall and bleed.
04-28-03, 10:39 AM
#10
Former Moderator. RIP Icemark.
The seals are really pretty cheap. Typically less than $25 for the whole rebuild kit. Unless the reservoir is damaged, just do a quick rebuild. No fancy tools are needed at all.
The Zip tie method is almost as expensive as just replacing the reservoir seals since the reservoir seals are only like a buck or two each. Plus the Zip tie method is really only a temporary fix.
The Zip tie method is almost as expensive as just replacing the reservoir seals since the reservoir seals are only like a buck or two each. Plus the Zip tie method is really only a temporary fix.
04-28-03, 11:16 AM
#11
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Originally posted by Icemark
The seals are really pretty cheap. Typically less than $25 for the whole rebuild kit. Unless the reservoir is damaged, just do a quick rebuild. No fancy tools are needed at all.
The Zip tie method is almost as expensive as just replacing the reservoir seals since the reservoir seals are only like a buck or two each. Plus the Zip tie method is really only a temporary fix.
The seals are really pretty cheap. Typically less than $25 for the whole rebuild kit. Unless the reservoir is damaged, just do a quick rebuild. No fancy tools are needed at all.
The Zip tie method is almost as expensive as just replacing the reservoir seals since the reservoir seals are only like a buck or two each. Plus the Zip tie method is really only a temporary fix.
I should have said - "cheap temporary fix."
08-29-03, 06:21 PM
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brought back from the dead...... Im leaking break fluid pretty bad... its not the MC, i replaced that.. its not from the booster. . . and had a friedn pump the brake with the resivor cap off . .no foaming or sounds of any kind... soft mushy pedal... and only leaks like a freaking faucet when I DONT drive it.. when I do drive it it leaks a lot slower... I am sooo confused?!?!?