how do you pump out the air in your system... and how do you see the bubbles... on mine it is through the banjo bolt on top...

perhaps your pump is bad and leaking air.... often people change the filter and then it wont start becasue of air... and since you just had it done... i am guessing that it was done and pumped out and you drove it... and some how becasue of the filter change there is now air in the system...

have you tried pumping out the air.....