Do both left brake pedals have master cylinders? No, they don't. Your mechanics are taking advantage of your ignorance. Find a new honest mechanic. That hydraulic wheel brake system has been used successfully for decades, if your mechanic can't fix it than they aren't worth what you're paying them. They probably don't want to get dirty.
Okay. I've always said I never worked on airliners or small airplanes. I did work on one small airplane for a little while, eventually the brakes were becoming a very sore spot so we had to come up with a new strategy. We had brilliant people and they did some figuring, engineering and machining and we put T-33 brakes on it. I'm an idiot when it comes to brakes, please educate me.
Well, you've perfectly encapsulated the mechanic I don't want working on my plane. A bold statement responded to with a factual contradiction; you asked for clarification and education and when so provided you followed up with a derogatory response. That lack of professionalism is just embarrassing. I wouldn't stand for it in my business and I wouldn't accept it in my mx shop.If that picture gives you a headache than perhaps working on airplanes is not your calling. That's right, you're not actually going to fix it, you just want to question me. I'm a better mechanic than you. I've spent the 10,000 hrs and gotten very dirty and sad along the way. I prefaced what I said about the PA28 brakes with the fact I've never worked on them. I don't care, and neither does @Flied Rice, although I suspect he's entertained by the attack he's seen. My opinion remains the same, find a mechanic that wants to fix things rather than smoking a pencil.
Yeah, your recollection matches mine. I think the original Cherokee stole a bunch of stuff from the Tripacer, which also just had the single hand brake and the overhead crank for the trim.Does the parking brake apply both wheels?
This is from the deep recesses of my memory but the original cherokees had no toe brakes at all. Just the handbrake. When they added toe brakes they routed everything through the handbrake cylinder so it's between the toe brakes and the brake cylinders. So you have to bleed the handbrake as well as the toe brakes and if a seal in the hand brake is gone you may get these symptoms...
I also may have missed it but don't see where you've checked if the caliper at the wheel needs new seals?
I also second the people say saying follow the lines and look for leaks. I spent all afternoon once trying to get a 182 bled and it'd be good and then 20 minutes later it'd be spongy again... finally found the pinhole seep I'm the rubber lines beneath the floor.
When I taught in a Cherokee I always had the students get used to the hand brake as it often seemed more effective. I swear, after reading this thread, when my toes brakes need work someday, I'll have them taken out and sold on ebay.