Brakepedal sounds like inflating something with a foodpump!

[Gubien]

I think I have some brake problems here, my brakepedal does not seem to build up any pressure!

I can get pressure when the car is not running, 3-4 pump and the pedal is hard, and stays hard, until engine is started.
But when the car i running, and I press down the brakepedal, is sound like I'm trying to inflate a pool toy with a foodpump.

It's nearly impossible to get pressure, and it disappears VERY quickly.

I've tried my dads Pug 407, and if I pressed the pedel rappidly in idle, I was able to get some pressure, but it was fading out (which it's supposed to?)

I think it's been a long time since the car had new brakefluid, could is help change that?

/Regards Thomas

 

[Willie]

Could be brake fluid but more like the vaccum connection on the master cylinder leaking if it sounds like air. Also if the brake fluid hasn't been changed for a while get some RBF600 from Bill Badger 5

 

[UncleFester]

I would also get the fluid changed and get a full pressure bleed done, mine took 2 bleeds before it sorted itself out after changing rear calipers.

 

[Gubien]

Would I be able to see the leak?

 

[Gubien]

full pressure bleed ?? explain?

 

[UncleFester]

full pressure bleed ?? explain?

Machine that forces all the brake fluid out from the resevoir to the furthest point - no brake pedal pumping required so you know you got ALL of the old fluid out.

 

[Gubien]

Ok, never changed it myself, may'be i should get a mecanic...hehe

But isnt it "just" to drain it, tap it off in each corner. refill, tap out and stop when there are no bobles, in the order right rear, left rear, front right, front left? Ofcause make sure to there are new fluid the the reservoir

 

[Willie]

Would I be able to see the leak?

Whilst pressing the brake pedal get a solution of washing up liquid/water, pour over suspected area. If it bubbles up you have an air leak

 

[karlosR]

I would also get the fluid changed and get a full pressure bleed done, mine took 2 bleeds before it sorted itself out after changing rear calipers.

did total-vag do that for you pat? i think i need mine doing

 

[UncleFester]

did total-vag do that for you pat? i think i need mine doing

Yes and i'd not fancy doing it myself - better off left to people that know what they're doing!

 

[Willie]

After re reading my post this won't work as its vaccum you are trying to detect not air leak.
So don't do what I said above as this will fill the system with soapy bubbles which I don't think will help your caes.
AND whats a FOODpump??

 

[DPJ]

I think I have some brake problems here, my brakepedal does not seem to build up any pressure!

I can get pressure when the car is not running, 3-4 pump and the pedal is hard, and stays hard, until engine is started.
But when the car i running, and I press down the brakepedal, is sound like I'm trying to inflate a pool toy with a foodpump.

It's nearly impossible to get pressure, and it disappears VERY quickly.

I've tried my dads Pug 407, and if I pressed the pedel rappidly in idle, I was able to get some pressure, but it was fading out (which it's supposed to?)

I think it's been a long time since the car had new brakefluid, could is help change that?

/Regards Thomas

Yes, get your brake fluid changed and power-bled. See if that solves the problem, or if you have a leak / master cylinder problem.

Yes and i'd not fancy doing it myself - better off left to people that know what they're doing!

So your brakes are ok now, Pat?

 

[Gubien]

hahahhahahaha.....I thinks it's something that pumps food

 

[Andrewcupra TDI]

i can hear a pumping noise


i also get like a grinding noise at low speeds too

 

[Gubien]

btw. how big inner diameter should I go for? Concerning the plastic hose? 4,5,6 mm?