Hey there, guys,

Quick question. When pressing the brake pedal, does the brake booster make a hissing sound or somewhat of an airy noise for anyone else? The pedal is also somewhat spongy.

I'd assume the vacuum diaphragm in the booster is torn, but I figured I'd ask before I go changing it, and more importantly, fix it before the brakes fail while driving.


Thanks!

Sounds like the booster is toast.

Also, I'll bet the master cylinder is bad; the more common failure is that the master cylinder has a slight leak, and leaks brake fluid into the booster - which eats out the rubber.

I'd do both due to your cousin and mine, Justin Case.

Suggestion: To avoid an unsightly rust patch, mask and paint the booster and possibly the master cylinder.

RwP

What a coincidence. This is one of the items that I am fixing on mine as well.

And yes, Master Cylinder and booster both. For the reason you state.

Since these are being both replaced, which means everything needs to be bled, then I asked them to do DOT 5 Synthetic fluid.