05 Toyota Tacoma without traction control but has ABS
A few weeks ago I noticed the brake pedal felt mushy. I had my wife step on the brakes with the engine running. I could hear a swoosh of air coming from the rear of the engine near the firewall but more towards the passenger side. I did the following tests:
- with engine off pump brake pedal and it built preassure and stayed firm.
2.with engine RUNNING held foot on brake and turned engine off. The brake pedal moved slowly to the floor.
- Check the check valve in the brake booster and its good.
So, I replaced the Brake booster, bleed the air out of the master cylinder and bleed the brakes. Now it feels great for about the first 20min of driving but then goes soft again. and I’m still getting the swoosh of air escaping from somewhere in the same place as before.
I’m wondering if I have a vacuum leak somewhere before it goes into the brake booster? the connection is good where the vacuum hose comes from the engine to the brake booster. OR should I replaced the master cylinder?
Thanks in advance for any help.
Semper Fi to all the veterans out there on this great Memorial Day.