2014 Q5 2.0 Brake vacuum
#1
AudiWorld Member
Thread Starter
2014 Q5 2.0 Brake vacuum
So i used to be able to leave my Q5 parked for a week, hop in, press the brake ( it still had vacuum left in the brake booster) start up and drive away.
This week I had the brake fluid changed ( I know they don't touch the vacuum system to do this), but now after sitting for just 5 hours, the brake pedal is stiff as a rock... there is no vacuum assist left ( of course its perfectly fine a second after starting the vehicle).
Audi says its normal. I say it wasn't "the" normal the day before i brought it in.
So... how long does it take your 2014 Q5 to loose vacuum assist when parked? How many hours or days of sitting before you come to a car with a hard brake pedal?
Cheers
This week I had the brake fluid changed ( I know they don't touch the vacuum system to do this), but now after sitting for just 5 hours, the brake pedal is stiff as a rock... there is no vacuum assist left ( of course its perfectly fine a second after starting the vehicle).
Audi says its normal. I say it wasn't "the" normal the day before i brought it in.
So... how long does it take your 2014 Q5 to loose vacuum assist when parked? How many hours or days of sitting before you come to a car with a hard brake pedal?
Cheers
#2
Most cars I've owned hold vacuum for several days. An '06 BMW 325i I had would lose residual vacuum in a couple hours too.
Could be Bosch brake boosters and ABS systems are prone to this.... and Nissin and everyone elses are not.... haha.
Not sure why a brake flush would cause this. Usually it's a seal that's leaking or a leak on a vacuum hose. This is only on the manifold vacuum side, not hte brake side, so a flush should not have affected this. Maybe all the pumping to bleed it wore out a check valve or seal. Not sure.
Could be Bosch brake boosters and ABS systems are prone to this.... and Nissin and everyone elses are not.... haha.
Not sure why a brake flush would cause this. Usually it's a seal that's leaking or a leak on a vacuum hose. This is only on the manifold vacuum side, not hte brake side, so a flush should not have affected this. Maybe all the pumping to bleed it wore out a check valve or seal. Not sure.
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