Try this...
Ina safe area apply the emergency brake slowly until it starts to grab. If they grab smooth then the issue is with the front brakes. If it pulses then the issue is with the rear brakes. This will isolate where you need to look.
In most cases the pulse issue is a front brake issue. They do the vast percentage of your stopping and get the most abuse as a result..
When they did the brakes did the turn the rotors, replace them, or simply install new pads????
