Do I need a new brake booster?

[78F350]

Grant, I received your message and I'll just reply here. I have replaced two brake boosters with used ones and there were no issues afterward. Both of the ones I replaced still held a good vacuum, but had internal problems. One had corrosion causing it to bind. Another had a leaking seal allowing brake fluid into the booster.

Your troubleshooting process looks logical, but before taking the trouble to replace it there are a couple more steps you can take to be sure. Check this page: https://m.roadkillcustoms.com/test-power-brake-booster/.

You might as well do a full brake system flush while you're at it.

[elgyqc]

Originally Posted by 78F350

Grant, I received your message and I'll just reply here. I have replaced two brake boosters with used ones and there were no issues afterward. Both of the ones I replaced still held a good vacuum, but had internal problems. One had corrosion causing it to bind. Another had a leaking seal allowing brake fluid into the booster.

Your troubleshooting process looks logical, but before taking the trouble to replace it there are a couple more steps you can take to be sure. Check this page: https://m.roadkillcustoms.com/test-power-brake-booster/.

You might as well do a full brake system flush while you're at it.

Thanks 78F350, I did the tests suggested. This is my test rig for verifying the check valve. I blow in the hose and air passes to the engine manifold and when I suck on it nothing happens, so the valve is good.



I did a brake fluid flush recently, so I hope to change the booster, following the video you did, without having to bleed the system.