Hello All,

I've been reading threads on this forum for a while, so I figured I'd join.
I have a question in regards to the vacuum lines on a motor mount:

I have a 02 Accord V6, auto.
For example, when not moving and stepping on the brakes, the pedal goes down as normal. But then if I hold it there, it'll continue to go down a little more, without applying more pedal pressure. Could this be due to a vacuum leak somewhere?
Reason I ask that is I noticed a metal line going to a front motor mount is pretty rusty, and was wondering if it could have a pin hole in it.
From reading on this forum, from threads such as the one below, I've learned that is a vacuum line.
Vacuum Line On A Motor Mount??... - Honda-Tech - Honda Forum Discussion

Could a leak on that line cause what I am feeling with the brake pedal? And does the vacuum in that line only operate at idle? And not higher rpms? So at higher rpms, the line is effectively dead?

Thank you!

 

Hey, has anyone dealt with this before?

 

It would depend on how the pedal behaves with the car off. If it still goes soft with the car off you would be looking at a hydraulic issue (like a leaking master cylinder) but if its only when its on, i'd def question a vac leak

I would be more skeptical of the vac hose going to the rear mount than the hardline itself, but if in doubt can always wrap the hardline in some sort of tape etc just to rule out that being a potential vac leak source

 

The car has sat for a few days, so I just stepped on the brake pedal and it moved a little and stayed in one spot with pressure on it, and was very hard. Which makes sense as there's no longer vacuum being replenished.
Started the car to build vacuum back up, stepped on the pedal and it goes down, and then you can keep pushing it some more.
I think this rules out the master cylinder itself and maybe points to a vacuum leak? Idle doesn't really change when braking so leak might be very small.

And you mentioned rear mount, Do you mean the one on the drivers side rear, or is there another one more central in the car?
Do you know what size those hardlines are in case I have to replace them? Some runs are straight so luckily shouldn't make much effort with bending/cutting to length.