Lubricate with brake fluid so everything slides in. The seals and dust boot can be tricky to work with. Installing the piston back in requires the tool and a c-clamp to simultaneously push and turn. That requires tools, vice, snap ring pliers etc. No need to disturb the parking brake mechanism unless it is seized or leaking. The seal is deep enough in the bore so that the piston is aligned once over the seal.īe aware that the rear calipers are significantly more complex than the fronts. If you pressed the pedal once the caliper was removed from the carrier, you could get fluid leakage if the piston was pushed out past the seal. ![]() The piston cannot be misaligned enough to allow fluid leakage. If you had brake fluid anywhere on the caliper, rebuild/replace it. Nothing hydraulic would prevent retracting them unless the pedal was depressed. The difficulty you had retracting the pistons, could be from corrosion around the seals, inside the boots etc. Very Slight Leak from Caliper Bleed Screw - NASIOC NASIOC > NASIOC Technical > Brakes, Steering & Suspension Very Slight Leak from Caliper Bleed Screw Welcome to NASIOC - The worlds largest online community for Subaru enthusiasts As an Amazon Associate I earn from qualifying purchases. The pistons don't retract fully, there is no spring return in the caliper. Obviously, this allows the pads to release once pedal is released. At rest (pedal not depressed), the fluid passages are open to allow fluid to return to the master cylinder. ![]() Running the engine has absolutely no effect on the brake system until the pedal is depressed.
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