Brake booster squeal

[Eric Winkworth]

Well I'm putting some good km's on the 70 series again and a few little things have popped up but this one has become increasingly irritating, it started off like a slight hiss and now it's fairly loud... Still have good braking performance, but I would assume my booster is on it's last legs...

Anyone done a rebuild or can offer any advice on the subject? If it wasn't getting to be so loud I wouldn't even bother messing with it...

Cheers
Eric

 

[Eric Winkworth]

bump...

Basically it only whines or squeals when the peddle is about half way depressed....

Anyone?

 

[roscoFJ73]

It doesnt look that complicated to rebuild,but you might find a used one for peanuts.They dont play up very often.
You might even find its the same as a north american FJ60

Does your vacuum hose have a good seal?
It has an o ring on the booster end that is supposed to be covered in lithium grease.

 

[Eric Winkworth]

Thanks for the reply rosco... Would I have to take the unit apart to apply the lituim grease?

When I was looking at the other day, the bellow on the brake pedal looks to have foam inside of it this is where the sounds seems to come from. I was thinking the foam maybe in thre to muffle any noise like this when braking and maybe it's deteriorated over time?

It does kind of seem like it's just a seal that could use some lubrication, because the noise fades and comes back from day to day and I have yet to experience any loss in braking performance....

I just want to be sure it isn't something stupid before I try and source a used unit!

Cheers!

 

[roscoFJ73]

Thanks for the reply rosco... Would I have to take the unit apart to apply the lituim grease?

When I was looking at the other day, the bellow on the brake pedal looks to have foam inside of it this is where the sounds seems to come from. I was thinking the foam maybe in thre to muffle any noise like this when braking and maybe it's deteriorated over time?

It does kind of seem like it's just a seal that could use some lubrication, because the noise fades and comes back from day to day and I have yet to experience any loss in braking performance....

I just want to be sure it isn't something stupid before I try and source a used unit!

Cheers!

My mistake ,there is no hose with an oring that needs greasing.I must have drifted into another section of the manual:crazyeyes:
But there is still the vacuum hose that fits over the tube into the booster.I would check that for leakage as a preliminary measure

There is a piece of foam in there and 2 pieces of felt inside a rubber boot,maybe that what you can see.
They probably stop something from rattling around.
I would have a go at fixing it,but have a used one lined up just in case.