Don't know what to tell you the P chassis does have a history of the brakes feeling soft but not of caliper problems as the W series. They do need the same maintenance needs as the W series, the brake fluid needs to be flushed at least every 2 years. With that many blowouts I would ask what does the rig weight, how you determined the inflation psi, how old are the tires and what brand as I don't want to buy any? Hopefully you have had your share of challenges for awhile!
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Paul
W20/Trek28RB2
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