Brakes work, but booster doesn't

Chasma · Post by **Chasma** » 27 May 2018, 12:06

When I brake while driving, the booster starts, but gives out almost immediately, so I have to basically stomp on the pedal to actually stop. I tested the hose going to the booster, there's no leak.

Post by **FLXC90** » 27 May 2018, 14:44

sitting still do you hear a big chuff of air when you push the pedal?
normal failure mode is a hole in the diaphragm. Other way is hole in the outer housing, like rust-through.

Post by **Clemens** » 27 May 2018, 15:37

Just out pf curiosity: is it a gas powered volvo or one with the audi diesel? The diesels have a vacum pump that goes bad. I just had that on my VW Multivan.

Chasma · Post by **Chasma** » 28 May 2018, 10:37

FLXC90 wrote: 27 May 2018, 14:44 sitting still do you hear a big chuff of air when you push the pedal?
normal failure mode is a hole in the diaphragm. Other way is hole in the outer housing, like rust-through.

It sounds more like a squeaky toy could that be the same thing?

Chasma · Post by **Chasma** » 28 May 2018, 10:37

Clemens wrote: 27 May 2018, 15:37 Just out pf curiosity: is it a gas powered volvo or one with the audi diesel? The diesels have a vacum pump that goes bad. I just had that on my VW Multivan.

Thanks, but it's gas powered.

Post by **FLXC90** » 28 May 2018, 11:22

If you have a helper, one press brake, one listen for where the squeaker is. use a length of tubing as a stethoscope if necessary, to really nail it down, unless it is obviously inside the can. (booster)