Master Cylinder ???
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Junior User
Joined: Feb 2009
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Master Cylinder ???
I have a bad brake master cylinder that is leaking fluid back into the booster when you let off of the pedal. I am replacing the master cylinder in the next couple of days depending on time. But my question is, will the brake fluid that is leaking into the booster hurt it because it just drains right back out? I need to know if this job just went from a $25 fix to a $100 fix. Any feed back good or bad will be appreciated.
Elder User
Joined: Jan 2008
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From: Gatineau, Quebec
Have you thought about a rebuild kit?
I would pull the MC and take a look at the seals on the plunger. Likely all that is wrong, and is super cheap and easy to do.
Having said that, a new MC is not overly expensive and just as easy to swap.
I'm not really sure about the effects of the fluid leaking back into your booster though.....
If you do go with a new MC, do make sure you bench bleed it before installing it.
I would pull the MC and take a look at the seals on the plunger. Likely all that is wrong, and is super cheap and easy to do.
Having said that, a new MC is not overly expensive and just as easy to swap.
I'm not really sure about the effects of the fluid leaking back into your booster though.....
If you do go with a new MC, do make sure you bench bleed it before installing it.
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Junior User
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I got the new MC yesterday and I am going to install it in the next couple of days when I get the time. It was only $15, however I asked for new bleeder valves as the ones on my calipers are stripped and I need to replace them. The guy at Advance Auto looked and said they were $11 for bolts with holes in them. This can't be correct. I am looking around now and if that is what they are then I guess I have no choice but to pay the "ransom" for the new bleeder valves.
Elder User
Joined: Apr 2009
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From: Upstate New York
11 bucks for 2 bleeder screws?? wow. A junkyard would give them to you for nothing, probably.
I had the master leak brake fluid into the booster on my Mustang, years ago. I wasnt all that comfortable with the rubber diagram being soaked with brake fluid, plus I couldnt seem to get all the fluid out of it, so I swapped it for a good used booster. Maybe if you could wash it out with soap and water, or at least flush it with plain water and make sure it ends up dry when you're done, it'd be alright.
I had the master leak brake fluid into the booster on my Mustang, years ago. I wasnt all that comfortable with the rubber diagram being soaked with brake fluid, plus I couldnt seem to get all the fluid out of it, so I swapped it for a good used booster. Maybe if you could wash it out with soap and water, or at least flush it with plain water and make sure it ends up dry when you're done, it'd be alright.
Elder User
Joined: Jan 2008
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From: Gatineau, Quebec
Well.....
the bleeder screws should already be inserted in the caliper, but I've always bought semi-loaded calipers....not sure if that matters.
Rock Auto has them for alot cheaper than what you quoted, so I'm sure you could find them cheaper locally as well
http://www.rockauto.com/catalog/x,ca...eeder%2BDORMAN
More Information for DORMAN 13901
the bleeder screws should already be inserted in the caliper, but I've always bought semi-loaded calipers....not sure if that matters.
Rock Auto has them for alot cheaper than what you quoted, so I'm sure you could find them cheaper locally as well
http://www.rockauto.com/catalog/x,ca...eeder%2BDORMAN
More Information for DORMAN 13901