Bubbles coming from Master Cylinder
#1
11-05-2018, 08:36 PM
Bubbles coming from Master Cylinder
Ok so I finally added the rear self adjusters to the rear drum brakes. Well they might be out of adjustment and I'm getting air in the master cylinder. If I remove the cap and someone presses the brakes it shots the fluid up from the air. Could the rear brakes being out of adjustment cause this?
EDIT: It's the rear reservoir which means front brakes, but I did not touch them.
EDIT: It's the rear reservoir which means front brakes, but I did not touch them.
Last edited by MoparFanatic21; 11-05-2018 at 08:56 PM.
#2
11-05-2018, 09:22 PM
Fluid shooting up when you step on the brake is normal. The piston retracts far enough that fluid can fill the chamber the piston uses. The piston will actually suck fluid out of the reservoir when you let your foot OFF the brake, so, there is that short stretch of travel where the piston is attempted to build pressure (when you step on the brake) that the port to the reservoir is still open, and fluid does what fluid does. 
It follows the path of least resistance.
That said, you should NOT be seeing air bubbles there. That implies a bad seal somewhere. (likely the master itself.)
It follows the path of least resistance.That said, you should NOT be seeing air bubbles there. That implies a bad seal somewhere. (likely the master itself.)
#3
11-05-2018, 11:05 PM
Problem solved
Fluid shooting up when you step on the brake is normal. The piston retracts far enough that fluid can fill the chamber the piston uses. The piston will actually suck fluid out of the reservoir when you let your foot OFF the brake, so, there is that short stretch of travel where the piston is attempted to build pressure (when you step on the brake) that the port to the reservoir is still open, and fluid does what fluid does. It follows the path of least resistance.
That said, you should NOT be seeing air bubbles there. That implies a bad seal somewhere. (likely the master itself.)
It follows the path of least resistance.That said, you should NOT be seeing air bubbles there. That implies a bad seal somewhere. (likely the master itself.)
. Now on my way to Detroit for work 
#4
11-06-2018, 08:20 AM
Thank you Bryan! (Hope you don't mind me calling you that) I have been wrenching for 15 years and never had the cap off while pumping the brakes, usually doing things myself. I happen to have a buddy this time. Turned out the rear needed bleed because they needed adjusted way out. I guess you truly do learn everyday. What was happening is the fluid moving around was causing bubble which I thought was air. I was worried because I didn't touch any of the brake lines. Thanks again I really appreciate it . Now on my way to Detroit for work
. Now on my way to Detroit for work Detroit? You are going to be within spittin' distance of me. Should come by for a visit, if you have the time.
(I am about 80 miles west of detroit.)
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