I was at the dealer the other day and was talking with the shop manager. He said that I shouldnt be pumping the brakes when I change the fluid and blled the lines. He said the cars are sensitive and should be gravity bled only? Any suggestions? I would assume that un screwing the bleed bolt with out someone pumping the brakes would allow air to enter. The manager stated the opposite, he said that the old school way of pumping can lead to allowing air in.

 

Many ways to bleed the system, but if pumped correctly no problems. If done by gravity, air won't enter the system as long as you don't let it drain too long and forget to fill the master cylinder and one of the calipers runs low and then air will enter the system. It's a messy way of doing it unless you have hoses connected to all 4 bleeders, unless Brembo, then it will be 6.

 

IMO pumping will force more crud and particles trapped in the caliper, out of the system. Instead of only bleeding air, the whole hydraulic system should have a fluid flush, replacing the old fluid.

If both methods are performed correctly, there will be no problem.

 

unless you had a brake line open/removed from the caliper- there should not be any air in the system
All you need to do is a basic pump 4 times- hold brake pedal down- open bleeder-fluid comes thru- close bleeder- repeat until all clear fluid comes out,, then a few times more for safety

If new to this- place a 2x4 wood block under the pedal so it only goes 3/4 travel to floor- thats its normal operating range and protects the master cylinder from moving too far--thus damaging it

A hand operated vacuum system for the brakes works too- $25 harbor freight tools

 

I think the manager just wanted you to pay him 100-150 dollars and techs use their pressure pump machine to flush the lines..its fast and only takes 1 guy