does anyone have any feedback concerning the problem solver rear wheel cylinders that are being sold on e bay. are there really any differences compared to the over the counter wheel cylinders being sold. my brake pedal is spongy and have tried everything. it is disc front drum rear on a 1970 road runner,thanks

The problem solver is a smaller bore cylinder, what you can buy over the counter for your application will be a larger bore.

I installed them in a 67 barracuda that was converted to stock discs up front and installed an adjustable valve in the rear line, they work very well no premature rear wheel lockup. I'm going to be putting a set in my 69 Dart with drums all around , on a panic ctop the rears lock and the back end swings around .

Spongy brakes , sounds like you have air in the lines .

it seems like i get all the air out, then a month or 2 later i re bleed the brakes and find more air.thanks

I had a similiar problem with the frt disc brakes on my 70 coronet. b/fluid would seep out past threads on bleeder screws. tried two new sets,same. spongy pedal. finally used bleeders screws with check valve for one man bleeding, that sealed it.