Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › How to diagnose brake master cylinder vs. brake servo/booster? › Reply To: How to diagnose brake master cylinder vs. brake servo/booster?
September 16, 2020 at 5:32 pm
#963690
If there is no sign(s) of leakage … I hope you did check the vacuum hose connected to the booster.
You can test the brake booster with a manual vacuum pump to make sure it isn’t leaking.
But more likely, there is probably a bad seal inside the master cylinder allowing brake fluid to bypass.