I never heard this one before so I thought I would write it up. For the past 6 months I have had to bleed the rear brakes sometimes 2 times a week. Never leaks fluid, just gets air into the system some how. Could NOT figure it out. I was just about ready to replace the rear wheel cylinders, & brake lines when it hit me. I noticed when I would remove the brake fluid filler cap there would be a suction! AND when it got colder I would get more air in the rear cylinders.

The cause?

The filler cap vent was clogged up from over filling the brake fluid one time. I cleaned it up, and drilled a very small hole in the side of the cap in the vent hole to assist with venting.

It's worked great ever since, and NO air in the system.

 

hi
good tip !

i know i will not rember it though when it happens to me ?

 

Me too.
I did the same thing.

SFB

 

maybe that is why my brakes got better after bleeding them just cause I could not find anything else wrong with them. I will have to check it out!!!