While bleeding the brakes, there was an air sound when the pedal was pushed?

2010 HONDA ACCORD

156,000 MILES • V6 • 2WD • AUTOMATIC

STUMPEDACCORDOWNER

MEMBER
1 POST
FOLLOW

I just replaced the rear calipers and pads on my car. bled the system. While bleeding, there was an air sound when the pedal was pushed. pedal can be quickly pumped up and brakes respond, but then next time the pedal goes to the floor and no brakes at all. Master cylinder is full and there is no air in the brake lines (triple checked with clear stream of brake fluid at rear calipers.). Vacuum lines to booster seem okay. Air sound doesn't seem to be coming from booster. Hard to pinpoint this air sound from the pedal. Stumped.

Aug 29, 2022 at 2:40 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.

JACOBANDNICKOLAS

CAR REPAIR CONTRIBUTOR
110,190 POSTS

Hi,

I need you to try something. Pump the brakes up so you have a pedal and then hold pressure on it. See if it slowly goes to the floor.

If it does, replace the master cylinder. I realize there was likely no issue prior, but when the pedal goes to the floor, there can be corrosion in the Master Cylinder which damages the plungers. This is the result.

Take a look at this link. Let me know if you feel the Master Cylinder is the likely issue. If it is, I attached the directions below for replacing it.

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.

Images (Click to enlarge)

Aug 29, 2022 at 7:46 PM