Rear brakes overheating

[Blaze0010]

(10-03-2025 01:00 PM)Dave W Wrote:  I had the similar problem. The rear brake caliper could not slide freely, allowing the pad to retract, and/or rust in the cylinder bore. Which caused dragging and overheating.
Caliper rebuild kits are dirt cheap. While apart, polish the piston and cylinder bore, and coat with brake piston with fluid and then lube all the sliding surfaces.
Buy enough brake fluid to bleed all the calipers and get fresh fluid in all the calipers.

Problem is, rear caliper are brand new from rockauto (regenerated), so can't be that.
One thing i've noticed it's that is possible that also front brakes have a slight drag, but managed high temperature better than rears.
So i'm currently cleaning the master cylinder and try to make the correct adjustment to the brake booster push rod.
Since the issue seems to be affecting all brakes (more the rear) maybe the push rod has not the correct tolerance and generate a little bit of drag, keeping the brake even so slightly pushed (or not letting the piston get back) enough to overheat the discs.