Hey guys, I've got a 70 maverick will all drum rear to front. I've replaced the master cylinder, shoes, & cylinders. I've bled out the system numerous times and bench bled the master. My pedal seems to be very close to the floor and gives little to no travel, but i do receive pressure. But it seems to not be enough to actually stop the vehicle when in motion under even low speeds. If I hold the brake and try to turn the wheel by hand it does hold the wheel, and even when i jacked up the rear end and let the tires spin and hit the brake it stops them. I've also adjusted the shoe clearance. I'm honestly all out of ideas and this has begun to become extremely frustrating. If anyone has any idea as to what the issue may be, please let me know. Thanks!!
New or rebuilt master? What cylinder are u using 4wh. drum or disk/drum. Seems like you have covered all the basis/basics for brake rebuild -- my thoughts-- defective mc, or wring mc. I personally, do not believe in rebuilt mc's.
I can't recall if it was rebuilt or not, i bought it awhile ago. It's all wheel drum. I'm starting to believe I might have the wrong sized MC rod. Is that a possibility? But i'm also unsure of that because when i removed the old one (Which worked but didnt hold pressure) they seem to match up the same.
Whatever MC you bought should have had a rod come w/ it. But, u say the rods are matching, so I guess wrong rod theory wud not play. Wrong rod length will give the effect of difficulty stopping "not enough travel to affect efficient braking". I had that issue last summer, using a adjustable rod to get the brake pedal height lowered. The rod got the pedal where I wanted, but car was hard to stop. Put the correct back in, car stop like it's suppose to. I think you may have defective MC. That's my opinion. Others may chime in w/ more experience than me to offer some suggestions.
Sounds like you don't have the shoes adjusted close enough to the drums. With tire off the ground...how hard it it to turn? When you give it a spin does it turn 1/2 turn or more?
Agreed... Assuming new shoes there will be high spots, tighten all wheels till there is noticeable drag... If that doesn't help you likely have a bad master cylinder...
If adjustment on shoes (Drag) is correct. Brake hardware (Springs etc...) are good. You have no leaks. Your rubber brake hoses are good ( I have seen old ones balloon under pressure) Kinda spooky. Wheel cyls are good and properly sized for your application. Brakes are properly bled to remove air in system. You have a bad M/C...
Yea all of the above appears normal, and the shoes are adjusted properly. It must be a faulty M/C. Cause honestly i can't think of anything else lol! I'm going to attempt to switch out the old push rod from my factory M/C and put it into the new one and compare the lengths of the two. Just tossing coins up at this point!
Measure the masters bore size. If the bore is too small it will allow the pedal to go deep because of not enough volume to the brakes. They may have gave you the wrong Master.
The bore size is 1". Shoes are installed correctly. Everything has been bled correctly. I'm thinking it's either the incorrect length push rod. Or just a faulty M/C.
