i think i punctured my vaccuum hose

[Dilip]

Tonight..... after going for some intensive driving on the mountains with nv2fast, at the end i suddenly realised my brakes were very week. I had to step on the pedal very hard and the car won't stop as good.

When stationary, i could hear some hi pitched gas sound coming from the engine bay. So i popped the hood and i realised one hose coming out of the engine has a small leak near a connecting area. Could it be the brake's vacuum hose??? I dont know how it suddenly leaked! The whole night my brakes were fine, in fact they were performing extra well!

Luckily my car is underwarranty. Do u think it's a big problem?

[brick]

The brake booster does need vacuum to operate properly. Pedal effort will increase dramatically if it doesn't have it. Since it's under warranty I would just (carefully!) take it to the dealer and get it fixed. Should be a quick repair if that really is the problem.

Keep in mind that a punctured vacuum line will suck air, not release it. I'm hard pressed to think of anything that would release gas save the AC system.

[nvr2fast]

Yeap, it was sucking in air into the hose, not pushing it out. I confirmed this with a tissue.

It looks like it has either rubbed against the metal holder or the metal somehow eroded away the rubber.

And his battery was leaking too :shock: leaking battery fluid down the battery sides and metal... :shock:

Good thing we found out, because we were just about to follow an Altezza and some other car for some "spirited driving"!

[kpatz]

You could fix it temporarily by wrapping duct tape around the hose in the spot where the leak is. That should give you enough vacuum for your power brakes to work until you can take it in to get fixed.

To fix they just replace the hose, which is a quick fix.

[AirMoore]

And his battery was leaking too :shock: leaking battery fluid down the battery sides and metal... :shock:

Ahhh good times! :shock: :shock:

Dilip your car is falling apart... good thing you got the warrenty still.

[SmaartAasSaabr]

Dilip your car is falling apart... good thing you got the warrenty still.

Reminds me of my Mazda 626 :shock:

Yeah the hose is easy to replace or it should be, but how the heck does the hose get a hole? When you apply the brakes the stress on the hose actually goes down

[brick]

Yeah the hose is easy to replace or it should be, but how the heck does the hose get a hole? When you apply the brakes the stress on the hose actually goes down

Sounds like fatigue failure. Kinda like that 737 that fell apart in mid-air and had to land with 1/4 of the roof missing. :shock:

Maybe the rubber dried out/dry rotted? Never seen that on a car but who knows.

[SmaartAasSaabr]

Maybe the rubber dried out/dry rotted? Never seen that on a car but who knows.

I've had a lot of vac lines "pop" off on my Saab Turbos because the rubber gets hard and loses it's flexibility after so many years, then when you really hammer down the gas and the boost comes on strong the hoses just blow off. Particularly the PCV valve line. When that happens the relatively muted "whoosh" starts sounding like a 200 km/h hurricane :shock: Solution - replace hoses... but the hoses need to be 3,5 mm inner diameter, and the ones you'll see on the shelf are 3mm or 4mm

Also have had many vac lines dry rot and develop cracks where they slip on, then leak.

But on such a new car I wouldn't expect dry rot to set in yet.

[Dilip]

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[Dilip]

Today, when driving to the mazda dealer, the engine light also came on, and occasionally when idling my rpms would drop and the engine would almost stall.

They said its 99% the vacuum hose problem. The battery was leaking fluid, and it must have squirted outwards onto the hose causing it to decay/melt. Therefore it doesnt cover warranty.

They dont have stock for this, and need 2 weeks to order,

But i managed to take it to another garage who can replace just the broken part instead of the entire hose, so it'll be cheaper.

I guess i can't blame NVR2FAST coz it had nothing to do with excessive braking during our drives! :P