Home Test for Audi A3 1.9TDI Vacuum Pump: Assess Brake Response & Pedal Behavior with Gas

Question

Hello Today I showed up at the local brake repairman... Replaced the rear discs and pads. He did not order the fluid to be replaced because he took the old one and said it was quite clear. (I bought the car 3 years ago and didn't check the fluid) The specialist swore that I have a damaged...

budiet · Answer

I suggest plugging a vacuum gauge into the system and reading the vacuum value, unless you also want to measure the pump's efficiency, how many liters per minute it pumps.
Check the patency of the wires.

Anonymous · Answer

The fluid is not checked for clarity, only for electrical conductivity.

tzok · Answer

There may as well be a leak in the servo itself or the vacuum line.

makaronmc · Answer

I asked the guy if it was...
I know him because he comes from my town...

He said that he would not bet because there was nothing to do ... but we agreed that if it was the same, he would screw in the old pump and I would not pay anything for the work ;-)

vodiczka · Answer

Change the professional to another as soon as possible. When the brake fluid is watered, the hydraulic brake becomes pneumatic when braking frequently Did you buy new or used? In the stimulant, the liquid can be twice as old, the effects as above

toku74 · Answer

If you press the brake four or five times, you'll use up all the vacuum. The idling pump will not be able to replenish it /here the course to the right and the information why you do not drive at ease - this is one of the reasons/. You will check the vacuum with a meter - as they inform you earlier. The meter will indicate whether the vacum has the right value and you will be able to check for any leaks. As far as I know your engine, the vacum pump breaks down very often - the metal fitting in the pump loosens and there is a loss of vacum.

Dziaduszyn · Answer

Have you checked the servo itself?

makaronmc · Answer

The spec will check on Thursday, but he said that he has already eaten his teeth on the brakes and it will be the pump for 99%. And a damaged vacuum pump has something to do with the turbocharger?

Anonymous · Answer

may have. This vacuum also controls the boost limiting valve. The pump must create a vacuum of at least 0.7 bar.

Dziaduszyn · Answer

It does, if it is, for example, controlled by vacuum. Such a solution is used, for example, in discharge valves that are opened with the help of a vacuum pump.

jacek1008 · Answer

I might revive an old thread. How to measure the pump vacuum efficiency? It is the number of liters per minute. Added after 4 [minutes]: I might revive an old thread. How to measure the pump vacuum efficiency? It is the number of liters per minute.

marszałekkom · Answer

Maybe a water meter? But in practice it will be difficult to mount it, and even so the test will not give much, because it is not known what the factory performance should be. I know that in efficient cars the pump pumps out the air from the servo in about 2 seconds.

piotrekwoj1 · Answer

It's not about how much it pumps, it's about how quickly it will do it, i.e. how quickly it can recover the vacuum in the system.
The only way to assess this is to observe the vacuum gauge plugged into the system.

jacek1008 · Answer

Yes, I agree, but where to get reference values?

piotrekwoj1 · Answer

I don't think there is such a thing, just a comparison with a working car.

Home Test for Audi A3 1.9TDI Vacuum Pump: Assess Brake Response & Pedal Behavior with Gas

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