Brake booster leak?

[evilmopar]

I have an strange issue with my brake booster, i assume it´s the brake booster. When i drive slow for a while like cruising in town so when everyting gets kind of hot the brake booster makes a vacum leak sound and it´s only making the sound when i take the foot off the brake pedal, it´s very very lound and very annoying sound. But when i just touch the brake pedal it stops making the sound but when i let off the pedal it starts again. But if i hit the freeway or get out off traffic so i can run a bit faster and not be on the brake it stops, even when i drive slow it doesn´t make a sound until everything heats up again. I think it´s beacuse of the heat..

Does anyone have any idea what to do? The brake booster seems quite new.

 

[62 Dart Convertible]

Hej kompis

Your leak coming and going may have to do with vacuum level - i.e. when your on the freeway your vacuum level is not as high as when idling...

either way, if your booster has a vacuum leak, it either needs repair or replacement...

lycka till

 

[evilmopar]

Hej kompis

Your leak coming and going may have to do with vacuum level - i.e. when your on the freeway your vacuum level is not as high as when idling...

either way, if your booster has a vacuum leak, it either needs repair or replacement...

lycka till

Tjenare!
No i'm not sure about that, i run 20inHg both on highway (low throttel level) and on idle. I can cruise around and have no problem as long as the car is cold or ambient (spell) temp is low. But when the car is hot and/or temp outside gets warm the problem occures, and it happends quicker the hotter the outside temp is.

Tackar för svar.

 

[62 Dart Convertible]

Well that is odd! Either way, booster is suspect - repair or replace..

lycka kompis

BTW - your spelling is excellent.

BTWBTW, I don't speak Swedish - I just use Google translate ;-)

 

[69Runner]

To help diagnose, with the engine running and warmed up, remove the vacuum hose from the booster and see if the interior noise goes away. Note: plug the hose temporarily and do not drive around like this.

 

[evilmopar]

To help diagnose, with the engine running and warmed up, remove the vacuum hose from the booster and see if the interior noise goes away. Note: plug the hose temporarily and do not drive around like this.

I was over at kjalltrac and his brother yesterday and had a chance to hear the odd noise. But when we clamped the hose to the booster the noise stopped. And there was absolute no change in engine speed or idle, i guess if it was a vaccum leak to the engine speed or engine sound would have changed a bit. So next question.. Is there any ginormous super über springs inside so if i take it apart it will explode and everyone will die, or is it easy to take apart?

- - - Updated - - -

Well that is odd! Either way, booster is suspect - repair or replace..

lycka kompis

BTW - your spelling is excellent.

BTWBTW, I don't speak Swedish - I just use Google translate ;-)

Tack Frank
I guess your name is Frank, you almost tricked me into writing to you in swedish ;-) The brakebooster seems new, but the valve that sits on top has one connection broken, not the whole connection but maybe 1/2 - 2/3 of it, but the hose is on and the clamp clamps the hose but maybe when it gets hot it will swell and open a litle, small enough to make a hidious sound.

 

[evilmopar]

I think this could be it

 

[69Runner]

The booster with the large clamp contains a diaphragm and bellows inside, it should come apart without too much drama. Not sure about the crimped type. What does your booster look like?

- - - Updated - - -

Yes, that crack is bad! Hit it with some RTV.

 

[evilmopar]

The booster with the large clamp contains a diaphragm and bellows inside, it should come apart without too much drama. Not sure about the crimped type. What does your booster look like?

- - - Updated - - -

Yes, that crack is bad! Hit it with some RTV.

It looks like this (the valve is removed by me)

 

[evilmopar]

Cut connector just after the cracks

Cut 1" of 12mm cuppertube (10mm inside dia) and 2 comp high temp epoxi... just some finishing touch left..

 

[kjalltrac]

Looks good,
Hopefuly thats your problem right there.

 

[evilmopar]

Hope so to.

 

[62 Dart Convertible]

I hope that has it solved mate!

PS - Min svävare är full av ålar. :happy8: